Indoor Air Quality - Lecture 1
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Questions and Answers

What is the full form of EPA?

Environmental Protection Agency

What are the primary sources of Indoor Air Quality contaminants?

  • Volatile Organic Compounds (VOCs) (correct)
  • Pesticides (correct)
  • Radon (Rn) (correct)
  • Fireplaces and Chimneys (correct)
  • Asbestos (correct)
  • Nitrogen Dioxide (NO2) (correct)
  • Lead (Pb) (correct)
  • Stoves and Heaters (correct)
  • Secondhand Smoke/ Environmental Tobacco Smoke (correct)
  • Carbon Monoxide (CO) (correct)
  • Biological Pollutants (molds, viruses, bacteria) (correct)
  • Formaldehyde/Pressed Wood Products (correct)
  • Indoor Particulate Matter (correct)

Which of the following populations are most affected by poor IAQ?

  • Elderly (correct)
  • Chronically ill (especially those with respiratory or cardiovascular diseases) (correct)
  • Young (correct)

What is the main goal of ASHRAE 62.1?

<p>To specify minimum ventilation rates to minimize the risk of adverse health effects for building occupants.</p> Signup and view all the answers

ASHRAE 62.1 applies to all types of buildings, including low-rise buildings.

<p>False (B)</p> Signup and view all the answers

What are the two important factors that ventilation rates are based on?

<p>Occupancy and floor area of the space.</p> Signup and view all the answers

What are the three components of effective ventilation?

<p>Outdoor airflow (C), Effective air distribution and mixing (D), Contaminant controls (concentration limits for CO2 and VOCs) (E)</p> Signup and view all the answers

The standard provides specific limits for every possible indoor air contaminant.

<p>False (B)</p> Signup and view all the answers

What is the recommended indoor relative humidity (RH) range to minimize the growth of mold and dust mites?

<p>30%-60% (A)</p> Signup and view all the answers

What is the minimum efficiency reporting value (MERV) recommended for air filters in general building ventilation systems?

<p>6 to 8</p> Signup and view all the answers

Natural ventilation is always recommended as a primary source of ventilation.

<p>False (B)</p> Signup and view all the answers

What percentage of net occupiable floor area should openable areas (e.g., windows) be?

<p>4%</p> Signup and view all the answers

ASHRAE 62.2 is primarily focused on residential buildings, specifically low-rise buildings.

<p>True (A)</p> Signup and view all the answers

What is the main purpose of ASHRAE 62.2?

<p>To define the minimum ventilation rates and other measures to achieve acceptable indoor air quality in residential buildings.</p> Signup and view all the answers

How is the required ventilation rate for a whole building determined?

<p>Based on the square footage of the home and the number of bedrooms.</p> Signup and view all the answers

What is the minimum ventilation rate required for a kitchen exhaust?

<p>100 CFM intermittent or 5 air changes per hour continuous.</p> Signup and view all the answers

What is the minimum ventilation rate required for a bathroom exhaust?

<p>50 CFM intermittent or 20 CFM continuous.</p> Signup and view all the answers

Openable windows or other openings can replace mechanical ventilation systems.

<p>False (B)</p> Signup and view all the answers

Outdoor air inlets should be placed near sources of contaminants.

<p>False (B)</p> Signup and view all the answers

What is the recommended minimum efficiency reporting value (MERV) for air filters in HVAC systems?

<p>6 or higher</p> Signup and view all the answers

Controlling sources of indoor air pollution, such as VOCs, moisture, and combustion by-products, is a key component of source control.

<p>True (A)</p> Signup and view all the answers

Air cleaners, such as HEPA filters or electronic air cleaners, are required by ASHRAE 62.2 for all buildings.

<p>False (B)</p> Signup and view all the answers

What are the aspects of special considerations for multifamily buildings in ASHRAE 62.2?

<p>Need for additional ventilation in corridors and lobbies (A), Air leakage between units (B), Shared ventilation systems (C)</p> Signup and view all the answers

Why are unvented combustion appliances discouraged?

<p>Due to the risk of carbon monoxide (CO) buildup.</p> Signup and view all the answers

Unvented combustion appliances can be used without any limitations.

<p>False (B)</p> Signup and view all the answers

What are the key aspects of commissioning and maintenance for ventilation systems?

<p>Changing filters (A), Proper installation (B), Regular maintenance (C), Verification of ventilation rates (D), Inspecting ductwork (E), Ensuring exhaust fans are functioning properly (F)</p> Signup and view all the answers

ASHRAE 62.2 only focuses on indoor air quality, without considering energy efficiency.

<p>False (B)</p> Signup and view all the answers

Heat Recovery Ventilation (HRV) and Energy Recovery Ventilation (ERV) are discouraged for their energy inefficiency.

<p>False (B)</p> Signup and view all the answers

What is the main purpose of IAQ investigations?

<p>To gather information that could be helpful in determining the cause of potential indoor air quality issues.</p> Signup and view all the answers

What are the general office conditions that are important to investigate for IAQ?

<p>Floor waxing frequency (A), Housekeeping (B), Recent pesticide application (C), Presence of visible signs of dust (D), Evidence of moisture intrusion into the building (E), Carpet and drape shampooing frequency (F), Frequency of office vacuuming (G)</p> Signup and view all the answers

What aspects of air quality in the office are important to assess during IAQ investigations?

<p>Dustiness (A), Odor (B), Humidity (C), Temperature (D), Dryness (E), Drafts (F), Temperature fluctuation (G)</p> Signup and view all the answers

What was the primary reason for establishing the Environmental Protection Agency (EPA) in December 1970?

<p>To address pollution issues.</p> Signup and view all the answers

Legionnaire's disease is a type of pneumonia caused by breathing in contaminated water droplets or aerosols.

<p>True (A)</p> Signup and view all the answers

Which of the following is NOT a potential source of Legionella bacteria?

<p>Refrigerators (B)</p> Signup and view all the answers

What are the four key factors that determine indoor air quality?

<p>Temperature, humidity, airflow, and contaminant levels (A)</p> Signup and view all the answers

What does the term "MERV" refer to in the context of air filters?

<p>Minimum Efficiency Reporting Value (D)</p> Signup and view all the answers

ASHRAE 62.2 specifically focuses on residential buildings, especially low-rise buildings.

<p>True (A)</p> Signup and view all the answers

What is the primary purpose of heat recovery ventilation (HRV) and energy recovery ventilation (ERV) systems?

<p>To improve energy efficiency by recovering heat or energy from exhausted air and using it to condition incoming outdoor air.</p> Signup and view all the answers

Which of the following is NOT a question that could be helpful in investigating general office conditions?

<p>Are there any visible signs of dust? (C)</p> Signup and view all the answers

What is the name given to a serious type of pneumonia caused by the Legionella bacteria?

<p>Legionnaires’ disease</p> Signup and view all the answers

What are the four factors indoor air quality is based on?

<p>Contaminant levels (A), Temperature (B), Humidity (C), Air flow (D)</p> Signup and view all the answers

What are some of the types of biological pollutants found in indoor air?

<p>Viruses (A), Bacteria (B), Molds (C)</p> Signup and view all the answers

Which of the following populations are often most susceptible to poor indoor air quality?

<p>Elderly (A), Young Children (B), People with respiratory or cardiovascular diseases (C)</p> Signup and view all the answers

Which of the following are considered key strategies to improve indoor air quality?

<p>Air Cleaners / Filtration (A), Improved Ventilation (B), Source Control (C)</p> Signup and view all the answers

What does ASHRAE stand for?

<p>American Society of Heating, Refrigerating and Air-Conditioning Engineers</p> Signup and view all the answers

What does CFM stand for?

<p>Cubic feet per minute</p> Signup and view all the answers

ASHRAE 62.1 sets minimum outdoor air intake rates based on the occupancy and floor area of the space.

<p>True (A)</p> Signup and view all the answers

ASHRAE 62.1 specifies limits for every possible indoor air contaminant.

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.1 directly prescribes air change per hour rates (ACH).

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.2 recommends using air filters with a minimum efficiency reporting value (MERV) of 6 or higher.

<p>True (A)</p> Signup and view all the answers

According to ASHRAE 62.2, openable areas for natural ventilation should be at least 4% of the net occupiable floor area.

<p>True (A)</p> Signup and view all the answers

Natural ventilation is always recommended as the primary ventilation strategy.

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.2 specifically focuses on low-rise residential buildings.

<p>True (A)</p> Signup and view all the answers

ASHRAE 62.2 includes provisions for multifamily buildings, addressing issues like common ventilation systems and air leakage between units.

<p>True (A)</p> Signup and view all the answers

Which of the following are considered key areas for maintenance in ventilation systems?

<p>Inspecting ductwork (A), Ensuring exhaust fans are functioning properly (B), Changing filters (C)</p> Signup and view all the answers

ASHRAE 62.2 specifically recommends the use of high-efficiency particulate air (HEPA) filters in all residential buildings.

<p>False (B)</p> Signup and view all the answers

The use of heat recovery ventilation (HRV) and energy recovery ventilation (ERV) systems are recommended to improve energy efficiency while maintaining indoor air quality.

<p>True (A)</p> Signup and view all the answers

Which of the following questions is related to general office conditions in an IAQ investigation?

<p>Is there any evidence of moisture intrusion into the building? (A), How often is the office vacuumed? (B), How often are floors waxed? (C)</p> Signup and view all the answers

Which of the following questions is NOT related to air quality in the office during an IAQ investigation?

<p>Is the door open or closed? (A)</p> Signup and view all the answers

A website with information about indoor air quality is available at https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality.

<p>True (A)</p> Signup and view all the answers

What year was the EPA established?

<p>1970</p> Signup and view all the answers

What type of pneumonia is caused by the Legionella bacteria?

<p>Legionnaires' disease</p> Signup and view all the answers

What are some of the places where Legionella bacteria can be found?

<p>Water systems, hot tubs, respiratory devices, soil and compost, evaporative condensers, cooling towers, and humidifiers</p> Signup and view all the answers

What are the factors that contribute to indoor air quality?

<p>Temperature (A), Humidity (B), Airflow (C), Contaminant levels (D), All of the above (E)</p> Signup and view all the answers

Which of these is NOT one of the sources of indoor air quality contaminants?

<p>All of these are sources of indoor air quality contaminants (G)</p> Signup and view all the answers

Which of the following groups are most susceptible to poor indoor air quality?

<p>All of the above (D)</p> Signup and view all the answers

ASHRAE 62.1 applies only to commercial and institutional buildings.

<p>False (B)</p> Signup and view all the answers

The minimum outdoor air intake rates for a building are based on what?

<p>Occupancy and floor area of the space</p> Signup and view all the answers

What does ASHRAE 62.1 provide guidance on?

<p>HVAC system design, ductwork and air handling, and maintenance and operations.</p> Signup and view all the answers

What is the general rule of thumb for the minimum outdoor airflow rate?

<p>All of the above (D)</p> Signup and view all the answers

ASHRAE 62.1 uses carbon dioxide levels as a rough indicator of adequate ventilation.

<p>True (A)</p> Signup and view all the answers

What is the typical outdoor CO2 level?

<p>400 ppm</p> Signup and view all the answers

What are the two agencies that ASHRAE 62.1 references when it comes to limits for indoor air contaminants?

<p>Both A and B (B)</p> Signup and view all the answers

What does ASHRAE 62.1 define?

<p>Minimum ventilation rates and other measures to achieve acceptable indoor air quality in residential buildings.</p> Signup and view all the answers

ASHRAE 62.2 specifically applies to high-rise residential buildings.

<p>False (B)</p> Signup and view all the answers

What does ASHRAE 62.2 set for the whole-building ventilation system?

<p>Minimum continuous ventilation rates for the entire home</p> Signup and view all the answers

What is the formula for calculating the total ventilation rate as defined by ASHRAE 62.2?

<p>Qtotal=0.03×Afloor+7.5×(Nbr+1)</p> Signup and view all the answers

What are the minimum ventilation requirements for a kitchen?

<p>At least 100 CFM intermittent or 5 air changes per hour continuous.</p> Signup and view all the answers

Bathroom exhaust should be at least 50 CFM intermittent or 20 CFM continuous.

<p>True (A)</p> Signup and view all the answers

Natural ventilation is not allowed in ASHRAE 62.2.

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.2 recommends the use of air filters with a minimum efficiency reporting value (MERV) of 6 or higher for HVAC systems.

<p>True (A)</p> Signup and view all the answers

What does ASHRAE 62.2 emphasize regarding source control?

<p>Controlling sources of VOCs, moisture, and combustion by-products</p> Signup and view all the answers

ASHRAE 62.2 requires the use of HEPA filters or electronic air cleaners.

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.2 includes specific provisions for multifamily buildings.

<p>True (A)</p> Signup and view all the answers

ASHRAE 62.2 encourages the use of unvented combustion appliances.

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.2 requires that ventilation systems be properly installed and verified.

<p>True (A)</p> Signup and view all the answers

Homeowners or building operators are not encouraged to maintain ventilation systems regularly.

<p>False (B)</p> Signup and view all the answers

ASHRAE 62.2 focuses primarily on energy efficiency.

<p>False (B)</p> Signup and view all the answers

Heat recovery ventilation (HRV) or energy recovery ventilation (ERV) systems are not recommended by ASHRAE 62.2.

<p>False (B)</p> Signup and view all the answers

What are some of the things that could be helpful in IAQ investigations regarding general office conditions?

<p>Housekeeping, frequency of vacuuming, carpet and drape shampooing, floor waxing, presence of dust, recent pesticide application, and evidence of moisture intrusion into the building.</p> Signup and view all the answers

What are some of the aspects that are considered for air quality in the office?

<p>Odor (A), Dryness (B), Humidity (C), Dust (D), Temperature (E), Drafts (F), Temperature fluctuation (G)</p> Signup and view all the answers

What are the areas where recent changes should be investigated in regards to IAQ?

<p>All of the above (D)</p> Signup and view all the answers

Flashcards

Indoor Air Quality (IAQ)

The comfort level of indoor air based on temperature, humidity, airflow, and contaminant levels.

Legionnaire's Disease

A serious type of pneumonia caused by the Legionella bacteria, transmitted by contaminated water droplets or aerosols.

EPA

Environmental Protection Agency, established in 1970 by Richard Nixon.

Contaminants - Indoor Air

Substances that can negatively impact indoor air quality, including asbestos, mold, viruses, carbon monoxide, and more.

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ASHRAE 62.1

A standard specifying minimum ventilation rates and preventing problems associated with contaminated indoor air for commercial, institutional and residential buildings.

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Ventilation Rate - Office

5 CFM per person plus 0.06 CFM per square foot in office spaces

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Ventilation Rate - Conference

5 CFM per person plus 0.06 CFM per square foot in conference rooms

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Ventilation Rate - Classroom

10 CFM per person plus 0.12 CFM per square foot in classrooms

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Ventilation Rate - Retail

7.5 CFM per person plus 0.12 CFM per square foot in retail spaces

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Ventilation Rate - Theater/Auditorium

5 CFM per person plus 0.06 CFM per square foot in theaters/auditiorums

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Pollutant Stratification

Pollutants accumulating at different levels in a room or space.

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Source Control IAQ

Controlling the source of pollutant in a room or building.

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Improved Ventilation IAQ

Improving the air circulation in a room or building to remove pollutants.

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Air Cleaners IAQ

Using filters and other methods to improve air quality.

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CO2 Limit (ASHRAE 62.1)

Indoor CO2 levels should not exceed outdoor levels by more than 700 ppm.

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ASHRAE 62.2

A standard for ventilation in low-rise residential buildings.

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Minimum Ventilation Rate -Residential

Calculated based on floor area and number of bedrooms.

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Kitchen Exhaust

Exhaust required for kitchens to remove cooking fumes, typically 100 CFM intermittent or 5 ACH continuous.

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Bathroom Exhaust

Exhaust required for bathrooms to remove moisture and odors. Typically 50 CFM intermittent, or 20 CFM continuous.

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What is Indoor Air Quality?

The comfort level of indoor air, considering factors like temperature, humidity, airflow, and contaminant levels.

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Pollutants: Asbestos

A harmful mineral fiber found in some older building materials, posing a health risk when inhaled.

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Pollutants: Biological

Living organisms like mold, viruses, and bacteria, often found in damp environments, affecting indoor air quality.

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Pollutants: Carbon Monoxide (CO)

A colorless, odorless gas produced by incomplete combustion, often from stoves, fireplaces, or faulty appliances.

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Pollutants: Formaldehyde

A colorless, pungent gas found in some pressed wood products, paints, and other materials. Can cause respiratory problems.

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Pollutants: Lead (Pb)

A heavy metal found in older paints, pipes, and soil. Children are particularly vulnerable to lead poisoning.

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Pollutants: Nitrogen Dioxide (NO2)

A gas produced by burning fuels, often found in areas with heavy traffic or industrial emissions.

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Pollutants: Pesticides

Chemicals used to kill pests, but can be harmful to humans when exposed to them indoors.

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Pollutants: Radon (Rn)

A naturally occurring radioactive gas that can accumulate in homes, especially in basements.

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Pollutants: Particulate Matter

Tiny particles suspended in air, including dust, pollen, and soot, can cause respiratory issues.

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Pollutants: Secondhand Smoke

Smoke inhaled from burning cigarettes by others, posing health risks as it contains harmful chemicals.

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Pollutants: Stoves and Heaters

These devices can release harmful pollutants like CO and NOx into the air.

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Pollutants: Fireplaces and Chimneys

These can produce CO and particulate matter if not properly functioning.

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Pollutants: Volatile Organic Compounds (VOCs)

Organic chemicals that evaporate readily at room temperature, found in paints, cleaners, and furniture.

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Why is Poor IAQ a Concern?

Poor indoor air quality can cause discomfort and health problems, particularly for young children, the elderly, and those with existing health conditions.

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What is Pollutant Stratification?

The accumulation of different pollutants at various levels within a room or space.

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How to Improve IAQ: Source Control

Reducing or eliminating the source of pollutants in your home or building.

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How to Improve IAQ: Ventilation

Improving air circulation to bring in fresh air and remove pollutants.

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How to Improve IAQ: Air Cleaning

Using filters and other devices to remove pollutants from the air.

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What is ASHRAE 62.1?

A standard setting minimum ventilation rates for buildings to ensure acceptable indoor air quality.

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ASHRAE 62.1: Scope

Applies to commercial, institutional, and residential buildings (excluding low-rise buildings).

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ASHRAE 62.1: Ventilation Rates

Specifies minimum outdoor air intake rates based on space occupancy and floor area.

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ASHRAE 62.1: CO2 Limits

Indoor CO2 levels should not exceed outdoor levels by more than 700 ppm.

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ASHRAE 62.1: Contaminant Limits

Sets limits for specific contaminants, often referencing other health-based guidelines.

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ASHRAE 62.1: Air Changes Per Hour (ACH)

Provides guidelines for achieving a certain number of air changes per hour based on space volume.

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ASHRAE 62.1: Humidity Control

Recommends maintaining indoor relative humidity between 30% and 60% for better IAQ.

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ASHRAE 62.1: Air Cleaning

Suggests using filters with a minimum efficiency rating (MERV) of 6 to 8 for general ventilation.

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ASHRAE 62.1: Natural Ventilation

Requires at least 4% of floor area dedicated to openable windows for natural ventilation.

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What is ASHRAE 62.2?

A standard focused on ventilation in low-rise residential buildings.

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ASHRAE 62.2: Purpose

To define the minimum ventilation rates and other measures to achieve acceptable IAQ in residential buildings.

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EPA Establishment

The Environmental Protection Agency (EPA) was founded in December 1970 by President Richard Nixon.

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Indoor Air Quality Oversight

The EPA oversees indoor air quality as part of its broader environmental protection mission.

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Legionnaire's Disease Spread

Legionnaire's disease can spread through water sources in buildings, like cooling towers or hot tubs.

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Legionella Bacteria Location

Legionella bacteria can be found in places like water systems, hot tubs, and other water sources.

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ASHRAE Standard 62.1 Purpose

ASHRAE Standard 62.1 sets minimum ventilation rates and other measures to ensure acceptable indoor air quality in buildings.

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ASHRAE 62.1 Application

ASHRAE 62.1 applies to most occupied spaces, excluding low-rise residential buildings.

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ASHRAE 62.1 Ventilation Rate Determination

ASHRAE 62.1 calculates ventilation rates based on factors like space type, occupancy, and activities.

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ASHRAE 62.1 VOCs

ASHRAE 62.1 relies on other health-based guidelines for VOC (Volatile Organic Compound) limits.

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ASHRAE 62.1 ACH

ASHRAE 62.1 doesn't prescribe ACH (air changes per hour) directly but provides ventilation rates that translate to ACH.

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Recommended Indoor Humidity

ASHRAE 62.1 recommends maintaining indoor relative humidity between 30% and 60%.

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ASHRAE 62.1 MERV Rating

ASHRAE 62.1 suggests using air filters with a minimum MERV (Minimum Efficiency Reporting Value) of 6 to 8.

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ASHRAE 62.2 Focus

ASHRAE 62.2 focuses on low-rise residential buildings like single-family homes and multifamily buildings.

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ASHRAE 62.2 Application

ASHRAE 62.2 applies to low-rise residential buildings, including single-family homes, duplexes, and multifamily buildings up to three stories.

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ASHRAE 62.2 Ventilation Rate Formula

The formula is Qtotal = 0.03 × Afloor + 7.5 × (Nbr + 1), where Qtotal is the total ventilation rate in CFM, Afloor is the floor area in square feet, and Nbr is the number of bedrooms.

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Kitchen Exhaust Requirements

ASHRAE 62.2 requires at least 100 CFM intermittent or 5 air changes per hour continuous for kitchen exhaust.

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Bathroom Exhaust Requirements

ASHRAE 62.2 requires at least 50 CFM intermittent or 20 CFM continuous for bathroom exhaust.

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ASHRAE 62.2 MERV Rating

ASHRAE 62.2 recommends using air filters with a minimum MERV (Minimum Efficiency Reporting Value) of 6 or higher in HVAC systems.

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Unvented Combustion Appliances

ASHRAE 62.2 discourages the use of unvented combustion appliances due to carbon monoxide risks, but strict emission limits are required if used.

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Office IAQ Investigation Considerations

During an IAQ investigation in an office, consider factors like housekeeping practices, recent changes, and air quality characteristics.

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Office Air Quality Characteristics

During an IAQ investigation, observe characteristics like odor, humidity, dustiness, temperature, drafts, and temperature variations.

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Office IAQ Investigation - Recent Changes

Consider recent workspace changes, office-wide changes, and building-wide changes when investigating IAQ.

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ASHRAE 62.1 Ventilation Rate Calculation

ASHRAE 62.1 calculates ventilation rates based on factors like space type, occupancy, and activities.

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Study Notes

Indoor Air Quality - Lecture 1

  • EPA was established in December 1970 by Richard Nixon in response to pollution
  • Indoor air quality is an aspect of EPA oversight
  • Legionnaire's disease is a serious type of pneumonia caused by the Legionella bacteria
  • It's transmitted by breathing contaminated water droplets or aerosols
  • Cooling towers in a hotel ejected bacteria, exposing people and causing deaths
  • Bacteria can be found in water systems, hot tubs, respiratory devices, soil, compost, evaporative condensers, cooling towers, and humidifiers
  • The EPA's mission is to protect human health and the environment
  • Indoor air quality is based on temperature, humidity, airflow, and contaminant levels (particles and chemicals)
  • Sources of indoor air quality contaminants include asbestos, biological pollutants (molds, viruses, bacteria), carbon monoxide (CO), formaldehyde/pressed wood products, lead (Pb), nitrogen dioxide (NO2), pesticides, radon (Rn), indoor particulate matter, secondhand smoke/environmental tobacco smoke, stoves and heaters, fireplaces and chimneys, and volatile organic compounds (VOCs)
  • Populations affected by poor IAQ include young people, the elderly, and people with chronic respiratory or cardiovascular diseases
  • Good IAQ is when a building's indoor air is free of harmful chemicals and particles while temperature and humidity are comfortable
  • Poor IAQ occurs when indoor air temperature, humidity, chemicals, or contaminants rise to harmful or uncomfortable levels, affecting occupant health
  • Poor IAQ can increase the risk of serious health problems

Pollutant Stratification

  • Pollutants can aggregate at different levels within a room

How to Improve Indoor Air Quality

  • Source control
  • Improved ventilation
  • Air cleaners/filtration

ASHRAE 62.1

  • Goal: Specify minimum ventilation rates to minimize adverse health effects for building occupants
  • Scope: Applies to commercial, institutional, and residential buildings (excluding low-rise buildings)
  • Concepts:
    • Sets minimum outdoor air intake rates based on occupancy and floor area
    • Sets outdoor airflow, effective air distribution, and mixing
    • Sets contaminant controls (concentration limits for CO2 and VOCs)
    • Provides guidance on HVAC system design, ductwork, and air handling
    • Provides guidance on maintenance and operations

Minimum Outdoor Airflow Rates

  • Ventilation rates are generally given in cubic feet per minute (CFM) per person or square foot, depending on the space type
  • Office spaces: 5 CFM/person + 0.06 CFM/sq ft
  • Conference rooms: 5 CFM/person + 0.06 CFM/sq ft
  • Classrooms: 10 CFM/person + 0.12 CFM/sq ft
  • Retail spaces: 7.5 CFM/person + 0.12 CFM/sq ft
  • Theaters/Auditoriums: 5 CFM/person + 0.06 CFM/sq ft

Carbon Dioxide (CO2) Limits

  • ASHRAE 62.1 uses CO2 levels as an indicator of adequate ventilation
  • Indoor CO2 concentrations should not exceed outdoor levels by more than 700 parts per million (ppm) Typically, outdoor CO2 is about 400 ppm, so indoor should ideally be below 1100 ppm
  • This indicates adequate ventilation

Contaminant Limits

  • The standard does not specify limits for every possible indoor contaminant, but it references limits provided by other standards

Volatile Organic Compounds (VOCs)

  • Specific limits for VOCs are not directly specified in ASHRAE 62.1 but are often referenced from other health-based guidelines

Air Changes Per Hour (ACH)

  • ASHRAE 62.1 doesn't prescribe ACH directly; it provides ventilation rates translated into ACH based on space volume and outdoor air supply
  • Typical office environments achieve 4-6 ACH, depending on ventilation design and occupancy

Humidity Control

  • ASHRAE 62.1 recommends maintaining indoor relative humidity (RH) between 30% and 60% to minimize mold and dust mite growth

Air Cleaning

  • ASHRAE 62.1 recommends using filters with a minimum efficiency reporting value (MERV) of 6 to 8 for general building ventilation systems
  • Higher MERV ratings (e.g., MERV 13 or higher) may be recommended for spaces with high contaminant loads

Natural Ventilation Requirements

  • Openable areas (e.g., windows) should be at least 4% of the net occupiable floor area to allow natural ventilation
  • Natural ventilation should be used only where outdoor air quality is acceptable and can meet required ventilation rates
  • ASHRAE 62.2 focuses on residential buildings, specifically low-rise buildings

Detailed Summary of ASHRAE 62.2

  • Purpose: Define minimum ventilation rates and other measures for acceptable indoor air quality in residential buildings
  • Scope: Applies to low-rise residential buildings (single-family homes, duplexes, and multifamily buildings up to three stories)

Whole-Building Ventilation

  • ASHRAE 62.2 establishes minimum continuous ventilation rates for the entire home
  • The required ventilation rate is determined by the home’s square footage and number of bedrooms

Ventilation Rate Formula

  • Qtotal = 0.03 × Afloor + 7.5 × (Nbr + 1)
    • Qtotal = total ventilation rate in cubic feet per minute (CFM)
    • Afloor = floor area in square feet
    • Nbr = number of bedrooms

Local Exhaust Ventilation

  • Minimum exhaust ventilation requirements for specific rooms (kitchens, bathrooms) where moisture and pollutants are generated
  • Kitchen exhaust: At least 100 CFM intermittent or 5 air changes per hour continuous
  • Bathroom exhaust: At least 50 CFM intermittent or 20 CFM continuous

System Design Requirements

  • Air inlets should be placed away from contamination sources (exhaust vents, combustion appliances, high pollutant areas).
  • Air outlets should be positioned to remove indoor contaminants effectively.

Filtration

  • ASHRAE 62.2 recommends using air filters with a minimum efficiency reporting value (MERV) of 6 or higher for HVAC systems.

Air Cleaning and Source Control

  • The standard emphasizes controlling sources of indoor air pollution (e.g., VOCs, moisture, combustion by-products).
  • Proper installation, maintenance, and sealing of combustion areas are important.

Special Considerations

  • Multifamily Buildings: ASHRAE 62.2 addresses issues like air leakage between units and shared ventilation systems in multifamily buildings.
  • Unvented Combustion Appliances: Discourages the use of unvented combustion appliances because of carbon monoxide (CO) buildup risk.
    • Applies strict emission limits to these devices if used.

Commissioning and Maintenance

  • System verification: Ensure ventilation systems meet required ventilation rates and operate effectively
  • Maintenance: Owners/operators should maintain systems regularly (filter changes, ductwork inspections, and proper exhaust fan operation)

Energy Considerations

  • Energy efficiency: Designers should consider minimizing energy use during ventilation systems design
  • Heat Recovery Ventilation (HRV)/Energy Recovery Ventilation (ERV): HRV/ERV systems recover heat from exhausted air. Used to improve energy efficiency and condition incoming outdoor air

IAQ Investigations

  • General office conditions

    • General housekeeping
    • Frequency of vacuuming, carpet/drape shampooing, waxing
    • Signs of dust
    • Recent pesticide application
    • Evidence of moisture intrusion

  • Air Quality in the office

    • Odor
    • Dryness/humidity
    • Dusty conditions
    • Warmth/coolness

Drafts, Temperature Fluctuations, Within/Between Office/Floors

  • The standard also addresses issues related to drafts, temperature fluctuations, and changes between offices/floors

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Lecture 1 (8/27/24) - Indoor Air Quality PDF

Description

This quiz explores the fundamental aspects of indoor air quality as highlighted by the EPA. It discusses the origins of the EPA, the diseases caused by contaminated air, and various sources of indoor pollutants. Test your knowledge on how various elements like temperature, humidity, and airflow play a role in maintaining healthy indoor environments.

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