Questions and Answers
Chapter 4 of the IMC governs ventilation within buildings intended to be occupied, but is not applicable to ____.
smoke control systems
Air intake openings on structures in flood hazard areas shall _____.
be at or above the IBC required elevation
Outdoor air intake openings for ventilation purposes shall be located a minimum of ____ feet from the lot line.
10
When located above the contaminant source, gravity outdoor air intake openings provided for ventilation shall be located a minimum of ___ feet horizontally from any noxious contaminant source.
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Outdoor air intake openings shall be permitted to be located less than 10 feet horizontally from a street provided the openings are located not less than ____ feet vertically above such locations.
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In residential occupancies, the maximum opening size in a screen protecting an air intake opening in an exterior wall shall be not more than _____ inch measured in any direction.
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The operating mechanism for openings providing natural ventilation shall be controllable by _____.
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Where exterior openings are utilized under the natural ventilation provisions for obtaining the required ventilation air, the minimum openable ventilating area to the outdoors shall be ___ percent of the floor area being ventilated.
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Where adjacent spaces are used for natural ventilation purposes, the openings to the adjacent spaces shall have a minimum area of ___ percent of the floor area of the interior room.
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Whenever openings to adjacent spaces are used to provide natural ventilation, the minimum opening area shall not be less than ____ sq ft.
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Where openings below grade provide the required natural ventilation, the horizontal clear space shall be a minimum of _____ time the depth of the opening.
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For the breathing zone, boundaries for ventilation systems are measured at ___ and ____ inches above the floor.
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Ventilation supply systems shall deliver the required rate to the breathing zone, which extends to ___ feet from the enclosing walls.
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Ventilation air shall not be recirculated from one dwelling to another or to ____ occupancies.
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Supply air to a swimming pool and associated deck areas shall not be recirculated unless the air is dehumidified in order to maintain a maximum relative humidity of ____ percent.
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Unless prohibited by Table 403.3, air transferred from occupied spaces may serve as ____ air for required exhaust systems in kitchens.
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Ventilation rates for occupancies not represented in Table 403.3 shall be determined by _____.
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In addition to the general ventilation requirements, each nail station in a nail salon shall be provided with a source capture system capable of exhausting not less than ____ cubic feet per minute per station.
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A 1000 sq ft smoking lounge in a public space would require a minimum of ____ cf of outdoor air for ventilation purposes.
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Grilles and screens protecting outdoor air intake air openings in a commercial building shall have a maximum opening size of ___ inch in any direction.
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A 2000 sq ft street level retail sales space shall be provided with a minimum of ____ cfm of outdoor ventilation air.
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Automatic operation of a ventilation system serving an enclosed parking garage shall not reduce the ventilation rate below ____ cfm per sq ft of floor area.
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Mechanical ventilation systems shall be provided with ___ controls that will operate such systems whenever the spaces are occupied.
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Mechanical systems for uninhabited spaces shall automatically operate when the humidity exceeds ____ percent.
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Where a mechanical exhaust and supply air system serves a 1500 sq ft uninhabited underfloor space, what is the minimum required mechanical exhaust rate?
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Study Notes
Ventilation Regulations
- Chapter 4 of the IMC outlines ventilation requirements for occupied buildings, excluding smoke control systems.
- Air intake openings in flood hazard areas must be above the required IBC elevation to prevent flooding risks.
Air Intake Distance Requirements
- Outdoor air intake openings need to be at least 10 feet from lot lines to reduce contamination risks.
- When gravity outdoor air intakes are above a contaminant source, they must also be at least 10 feet away horizontally from such sources.
- Openings can be placed less than 10 feet from streets or loading docks if they are a minimum of 25 feet high vertically.
Residential Ventilation Standards
- In residential settings, screens protecting air intake openings cannot exceed a maximum size of 1/2 inch in any direction.
- Control of natural ventilation openings should be accessible to building occupants.
Openable Ventilation Areas
- The minimum openable area for ventilation should be 4% of the floor area being ventilated.
- For natural ventilation into adjacent spaces, openings must comprise at least 8% of the interior room's floor area.
Minimum Opening Area Specifications
- Openings to adjacent spaces used for natural ventilation must have an area no less than 25 square feet.
Horizontal Clear Space Requirements
- When utilizing below-grade openings for natural ventilation, the horizontal clear space must be at least 1.5 times the depth of the opening.
Breathing Zone Boundaries
- Ventilation systems’ boundaries are defined at 3 inches and 72 inches above the floor for the breathing zone.
Supply Air Specifications
- Ventilation air must not be recirculated between different types of occupancies, particularly dissimilar ones.
- For swimming pools, unrecirculated supply air must be dehumidified to maintain maximum relative humidity below 60%.
Makeup Air Regulations
- Occupied spaces may supply makeup air for exhaust systems, adhering to codes unless otherwise specified.
Determining Ventilation Rates
- Ventilation rates for unspecified occupancies must be derived from an engineering analysis.
Specialized Ventilation Needs
- Nail salons require a source capture system at 50 cubic feet per minute per nail station.
- A 1,000 square foot smoking lounge mandates at least 4,200 cubic feet of outdoor air for ventilation.
Commercial and Retail Ventilation Requirements
- Outdoor air intake openings in commercial buildings are limited to a maximum size of 1 inch.
- A 2,000 square foot retail space necessitates a minimum of 465 cubic feet per minute of outdoor ventilation air.
Parking Garage Ventilation
- Ventilation for enclosed parking garages must not fall below 0.05 cubic feet per minute per square foot of floor area.
Mechanical Ventilation System Controls
- Mechanical ventilation systems must be equipped with controls that can be operated either manually or automatically, ensuring function during space occupancy.
Humidity Control in Uninhabited Spaces
- Mechanical systems in uninhabited areas must automatically activate when humidity exceeds 60 percent.
Required Exhaust Rates
- For a 1,500 square foot uninhabited underfloor space, the minimum mechanical exhaust rate is set at 30 cubic feet per minute.
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Description
Test your knowledge on Chapter 4 of the IMC, which focuses on ventilation requirements for occupied buildings. This quiz covers air intake regulations, distance requirements, and residential ventilation standards. Assess your understanding of key concepts to ensure adherence to safety standards.
