2021 International Mechanical Code Flashcards
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Questions and Answers

For intermittent mechanical ventilation of an enclosed parking garage, the code requires automatic operation by means of __________ __________ detectors in conjunction with _________ _________ detectors.

carbon monoxide, nitrogen dioxide

Connecting offices, waiting rooms, ticket booths, and similar uses that are accessory to an enclosed public parking garage shall be maintained at a _________ pressure.

positive

The mechanical exhaust rate for ventilation of uninhabited spaces shall not be less than ________ cfm per square foot of horizontal area.

0.02

Single or combined mechanical exhaust systems for environmental air shall be _________ of all other exhaust systems.

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

The air removed by every mechanical exhaust system shall be discharged _________.

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

Exhaust discharge air shall not be exhausted into an _________ or crawl space.

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

Manicure tables and pedicure stations not provided with factory-installed exhaust inlets shall be provided with exhaust inlets located not more than _________ inches horizontally and vertically from the point of chemical application.

<p>12</p> Signup and view all the answers

What is the nominal size diameter of domestic clothes dryer exhaust ducts?

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

Dryer exhaust ducts shall not be joined with screws or similar fasteners that protrude more than ________ inch into the inside of the duct.

<p>1/8</p> Signup and view all the answers

Domestic clothes dryer transition ducts used to connect the dryer to the exhaust duct system shall be limited to a single length not to exceed __________ feet.

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

The maximum specified length of a domestic dryer exhaust shall be __________ feet from the connection to the transition duct from the dryer to the outlet terminal.

<p>35</p> Signup and view all the answers

The maximum length of a dryer exhaust duct exceeding 35 feet shall be determined by the installation instructions of the dryer manufacturer or the __________ ___________ __________ __________ manufacturer.

<p>dryer exhaust duct power ventilator</p> Signup and view all the answers

Dryer exhaust ducts serving commercial clothes dryers shall have a minimum clearance of ________ inches to combustible materials.

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

Domestic cooking exhaust equipment shall discharge to the ________.

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

Bolts, screws, rivets, and other mechanical fasteners used to support commercial grease ducts shall not ________ duct walls.

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

Commercial grease duct systems serving a Type I hood shall have a clearance to combustible construction of not less than _______ inches.

<p>18</p> Signup and view all the answers

Cleanouts located on horizontal sections of commercial grease ducts shall be spaced not more than ________ feet apart.

<p>20</p> Signup and view all the answers

The exhaust fan serving a Type I hood shall have _____ ______ that will activate the fan when the appliance is turned on, or a means of _________ shall be provided that will prevent operation of such appliances when the exhaust fan is not turned on.

<p>automatic controls interlock</p> Signup and view all the answers

Type I commercial kitchen exhaust hood shall be installed where cooking appliances produce _____ or _____.

<p>grease, smoke</p> Signup and view all the answers

Mechanical makeup air for commercial kitchen exhaust systems shall be automatically controlled to start and operate __________ with the exhaust system.

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

The temperature differential between makeup air in a commercial kitchen and the air in the conditioned space shall not exceed ______°F.

<p>10</p> Signup and view all the answers

_________ exhaust systems in different fire areas are permitted to discharge to a common hazardous exhaust shaft provided they meet all of the prescribed conditions.

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

Smoke control systems shall be supplied with _________ power.

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

In addition to meeting the requirements of NFPA 70, all wiring for smoke control systems, regardless of voltage, shall be fully enclosed within continuous _________.

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

The provisions of this code shall not be mandatory for existing buildings or structures identified and classified by the state or local jurisdiction as __________ buildings.

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

What is the liquid that condenses from a gas caused by a reduction in temperature?

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

Where there is a conflict between a general requirement and a specific requirement, the __________ requirement shall govern.

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

Where conflicts occur between provisions of the IMC and the referenced standards, the provisions of __________ __________ shall apply.

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

When authorized employees enforce this code they shall not be held _________ when acting in good faith and without malice.

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

The code official shall have the authority to render __________ of the IMC.

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

Where the code official finds that a proposed alternative material does not comply with the intent of the code provisions, the code official shall respond __________ __________, stating the __________ __________ it was not approved.

<p>in writing, reasons why</p> Signup and view all the answers

Permits shall expire and become null and void if the work authorized is not commenced within __________ days of issuance.

<p>180</p> Signup and view all the answers

How many extensions of an unexpired permit is the code official authorized to grant if reasonable cause is demonstrated?

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

Underground inspections shall be made after trenches or ditches are excavated and bedded, piping installed, and _________ backfill is put in place.

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

Rough-in inspection shall be made after the roof, framing, fireblocking and bracing are in place and all ducting and other components to be concealed are complete, and __________ to the installation of wall or ceiling membranes.

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

Final inspection shall be made upon _________ of the mechanical system.

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

Each day a code violation continues after due notice has been served shall be deemed a __________ offense.

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

The code official shall have the authority to authorize _________ of utility service to a building, structure, or mechanical system regulated by the IMC.

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

What is the minimum distance through air measured between the heat-producing surface of the mechanical appliance and the surface of the combustible material?

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

What is the treatment of air so as to control temperature, humidity, cleanness, and distribution?

<p>air conditioning</p> Signup and view all the answers

What is the term used for a system that includes heat exchangers, blowers, filters, and ducts?

<p>air conditioning system</p> Signup and view all the answers

What is the term for air removed from a conditioned space that is recirculated or exhausted?

<p>return air</p> Signup and view all the answers

BTU is the abbreviation for __________ __________ __________, which is the quantity of heat required to raise the temperature of 1 pound of water 1°F.

<p>British thermal unit</p> Signup and view all the answers

Any appliance in which the products of combustion have a temperature greater than 2,000°F is referred to as a __________ __________.

<p>high heat appliance</p> Signup and view all the answers

Any appliance in which the products of combustion have a temperature of 1,000°F or less is referred to as a __________ __________.

<p>low heat appliance</p> Signup and view all the answers

Any appliance in which the products of combustion have a temperature of more than 1,000°F, but not greater than 2,000°F is referred to as a __________ __________.

<p>medium heat appliance</p> Signup and view all the answers

What is a closed heating appliance intended to supply hot water or steam?

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

What is a primarily vertical structure that contains one or more flues?

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

What appliance is used to dry wet laundry by means of heat?

<p>clothes dryer</p> Signup and view all the answers

What is the air necessary for complete combustion of a fuel referred to as?

<p>combustion air</p> Signup and view all the answers

How many commercial kitchen hood types are listed in IMC Chapter 2, Definitions?

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

What device is installed in ducts to restrict the passage of flame?

<p>fire damper</p> Signup and view all the answers

What is a manually or automatically controlled device used to regulate airflow known as?

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

What is a continuous passageway for the transmission of air through ducts referred to as?

<p>duct system</p> Signup and view all the answers

What is an assembly of connected ducts and fittings through which air is conducted from spaces to the outdoor atmosphere?

<p>exhaust system</p> Signup and view all the answers

What is any location considered to be a fire hazard for flammable vapors and other substances referred to as?

<p>hazardous location</p> Signup and view all the answers

What type of equipment has a label or symbol of a nationally recognized testing laboratory?

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

Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing, and sanitation purposes is referred to as __________ __________.

<p>living space</p> Signup and view all the answers

A combination of approved bends that make two changes in direction is known as an __________.

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

A valve requiring one-quarter round turn or less is considered to be __________ opening.

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

Refrigeration Capacity Rating is expressed as 1 horsepower, 1 ton, or __________ BTU/h.

<p>12,000</p> Signup and view all the answers

The natural or mechanical process of supplying conditioned or unconditioned air is referred to as __________.

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

Each length of pipe and tubing in a mechanical system shall bear the __________ of the __________.

<p>identification, manufacturer</p> Signup and view all the answers

Appliances regulated by the IMC shall be __________ and __________.

<p>listed, labeled</p> Signup and view all the answers

Defective material or parts shall be replaced or repaired in such a manner to preserve the original approval __________.

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

Fuel fired appliances shall not be located, or obtain combustion air from, any of the following: __________, __________, __________, __________, __________, __________, or __________.

<p>sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms</p> Signup and view all the answers

A boiler installed in a closet shall be __________ for such __________.

<p>listed, installation</p> Signup and view all the answers

Appliances installed in other than indoor locations shall be __________ and __________ for outdoor installation.

<p>listed, labeled</p> Signup and view all the answers

Where an appliance is installed in a pit or excavation, the sides of the pit or excavation shall be held back a minimum of __________ inches from the appliance.

<p>12</p> Signup and view all the answers

Mechanical systems shall not be located in an __________ shaft.

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

Equipment and appliances having an ignition source and located in hazardous locations shall be elevated such that the ignition source is not less than __________ inches above the floor.

<p>18</p> Signup and view all the answers

Appliances located in public garages shall be installed a minimum of __________ feet above the floor.

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

Appliances located in private garages shall be installed with a minimum clearance of __________ feet above the floor.

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

Equipment and appliances installed at grade level shall be supported on a level concrete slab or other approved material extending not less than __________ inches above the adjoining grade.

<p>3</p> Signup and view all the answers

Guards shall be provided where appliances, equipment, fans or other components that require service and roof hatch openings are located with __________ feet of a roof edge.

<p>10</p> Signup and view all the answers

For appliances that require service and are installed on roofs, compliant __________ __________ / __________ __________ __________ devices are permitted to be installed in place of a required guard.

<p>fall arrest/restraint anchor connector</p> Signup and view all the answers

Copper-alloy tubing shall be supported every __________ feet when in a horizontal position.

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

Where sheathing is used to prevent direct contact between copper piping and concrete walls, the sheathing shall be plastic and have a thickness of not less than __________ inch.

<p>0.0008</p> Signup and view all the answers

Appliances, control devices, and HVAC components that utilize energy shall be accessible for __________, __________, __________, and __________ without removing other appliances.

<p>inspection, service, repair, replacement</p> Signup and view all the answers

Rooms containing appliances shall be provided with a door and an unobstructed passageway measuring not less than __________ inches wide and __________ inches high.

<p>36, 80</p> Signup and view all the answers

Attics containing appliances shall be provided with an opening large enough to allow __________ of the largest appliance.

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

The clear access opening dimensions attics containing appliances shall be a minimum of __________ inches by __________ inches.

<p>20, 30</p> Signup and view all the answers

The clear access opening dimensions for underfloor spaces containing appliances shall be a minimum of __________ inches by __________ inches.

<p>22, 30</p> Signup and view all the answers

Where items that require service are installed on a roof having a slope of __________ or greater, a level platform shall be provided on each side for access.

<p>3:12</p> Signup and view all the answers

What component is required for condensate drain systems in equipment and appliances containing evaporators?

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

Condensate shall not discharge into a street, alley, or other areas as to cause a __________.

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

Condensate waste drain line size shall not be less than __________ inch internal diameter.

<p>¾</p> Signup and view all the answers

An automatic appliance shut-off device is required for condensate pumps located in __________ __________.

<p>uninhabitable spaces</p> Signup and view all the answers

Protective assemblies shall not be placed less than __________ inch from mechanical appliances, devices, or equipment.

<p>1</p> Signup and view all the answers

Interior spaces intended for human occupancy shall be provided with space-heating systems capable of maintaining an indoor temperature of not less than __________°F.

<p>68</p> Signup and view all the answers

Chapter 4, Ventilation shall govern the ventilation of spaces within a building intended to be __________.

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

Every occupied space shall be ventilated by natural or __________ means.

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

Air intake openings for ventilation are permitted to be located less than 10 feet horizontally from streets provided that the openings are located not less than __________ feet vertically above such locations.

<p>25</p> Signup and view all the answers

Air intake openings shall be located no less than __________ feet below contaminant sources.

<p>3</p> Signup and view all the answers

Ventilation air intake openings in residential occupancies shall have protective screens with openings not less than __________ inch and not more than __________ inch.

<p>¼, ½</p> Signup and view all the answers

The amount of supply air shall be approximately __________ to the amount of return and exhaust air.

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

Mechanical ventilation supply systems shall be designed to deliver the required rate of outdoor air flow to the __________ __________ within each occupiable space.

<p>breathing zone</p> Signup and view all the answers

The ventilation rates are based on the absence of __________ in occupiable spaces.

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

In smoking lounges, __________ exhaust is required.

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

The minimum outdoor airflow required to be supplied to each zone shall be determined as a function of __________ classification.

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

Study Notes

Definitions and Key Terms

  • Historic Buildings: Existing structures identified by local jurisdictions are exempt from the code's mandatory provisions (Section 102.6).
  • Condensate: Liquid formed from gas due to reduced temperature (Section 202).
  • Specific Requirement: In conflicts, the specific requirement prevails over general ones (Section 102.1).
  • Code Provisions: In case of conflict between IMC provisions and referenced standards, IMC provisions take priority (Section 102.8.1).
  • Liability: Authorized employees are not liable when enforcing the code in good faith (Section 104.8).
  • Interpretations: The code official can provide interpretations of the IMC (Section 104.1).
  • Alternative Materials: Code officials must give written reasons for rejecting alternative materials that don’t comply with the code (Section 105.2).
  • Permits: Permits expire if work doesn't commence within 180 days of issuance (Section 106.4.3).

Inspection and Compliance

  • Extensions: Code officials can grant one extension of an unexpired permit with reasonable cause (Section 106.4.4).
  • Underground Inspections: Must occur after trench excavation, piping installation, and before backfill (Section 108.2, Item 1).
  • Rough-in Inspection: Conducted post-installation of ducting and prior to wall or ceiling membrane installation (Section 108.2, Item 2).
  • Final Inspection: Required once the mechanical system is complete (Section 108.2, Item 3).

Violations and Enforcement

  • Code Violations: Each day a violation persists post-notice is a separate offense (Section 115.4).
  • Disconnection Authority: Officials can disconnect energy sources during emergencies to eliminate hazards (Section 112.3).

Mechanical Systems

  • Clearance: Minimum distance between heat-producing surfaces and combustibles (Section 202).
  • Air Conditioning: Involves controlling air temperature, humidity, and cleanliness for conditioned spaces (Section 202).
  • Heating Appliances:
    • Boiler: Supplies hot water or steam for various applications (Section 202).
    • High Heat Appliance: Operates with flue temperatures over 2,000°F (Section 202).
    • Medium Heat Appliance: Operates between 1,000°F and 2,000°F (Section 202).
    • Low Heat Appliance: Operates at flue temperatures of 1,000°F or less (Section 202).

Ventilation and Airflow

  • Ventilation Requirement: Spaces must be ventilated by natural or mechanical means (Section 401.2).
  • Air Intake: Must be placed at least 10 feet from contaminants horizontally and below contaminants vertically (Section 401.4).
  • Minimum Outdoor Airflow: Determined based on occupancy classification (Section 403.1.1.1).

Rules on Equipment Placement

  • Appliance Installation: Specific conditions apply for garages, attics, and under floor spaces (Sections 304 and 306).
  • Hazardous Locations: Regulations restrict certain appliances from being placed in hazardous areas (Section 303.3).

Maintenance and Access

  • Access for Maintenance: Appliances must be accessible for service without removing other structures (Section 306.1).
  • Condensate Disposal: Condensate drains must not cause nuisance (Section 307.2.1).
  • Continuous Passageways: Duct systems include everything from ducts to fittings (Section 202).

Summary of Regulations

  • Exhaust Systems: Must discharge outdoors and not into attics or crawl spaces (Section 501.3).
  • Appliance Assembly: Appliances should allow for removal and access in their respective spaces (Sections 306.3, 306.4).
  • Exhaust Ducts for Clothes Dryers: Should not exceed specified sizes and must be installed correctly to ensure efficiency (Sections 504.9.1 and 504.9.2).### Domestic Clothes Dryer Regulations
  • Transition ducts for domestic clothes dryers must not exceed 8 feet in a single length.
  • Maximum length of domestic dryer exhaust from the transition duct connection to the outlet terminal is 35 feet.
  • For dryer exhaust ducts exceeding 35 feet, maximum length is determined by the dryer manufacturer’s installation instructions.

Commercial Clothes Dryer Standards

  • Dryer exhaust ducts for commercial dryers require a minimum clearance of 6 inches from combustible materials.

Exhaust Duct Specifications

  • Domestic cooking exhaust equipment must discharge outdoors.
  • Mechanical fasteners for supporting commercial grease ducts must not penetrate the duct walls.
  • Commercial grease ducts serving Type I hoods must maintain a clearance of at least 18 inches from combustible construction.
  • Cleanouts in horizontal sections of commercial grease ducts should be spaced no more than 20 feet apart.

Kitchen Exhaust Systems

  • Exhaust fans for Type I hoods must have automatic interlock controls, activating the fan when the appliance is on, or a means to prevent appliance operation without the fan.
  • Type I hoods should be installed where cooking produces grease or smoke.
  • Mechanical makeup air for commercial kitchen exhaust must operate simultaneously with the exhaust system.
  • The temperature differential between makeup air and the conditioned space must not exceed 10°F.

Laboratory and Safety Regulations

  • Laboratory exhaust systems in different fire areas can share a common hazardous exhaust shaft if they meet required conditions.
  • Smoke control systems must have standby power to ensure functionality during emergencies.
  • All smoke control system wiring, regardless of voltage, must be fully enclosed within continuous raceways, complying with NFPA 70 standards.

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Test your knowledge of the 2021 International Mechanical Code with these flashcards. This quiz covers key terms and definitions, including historic buildings and condensate, which are essential for understanding the code's provisions. Perfect for students and professionals alike!

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