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// CODE SNIPPET

3004.3 Area of Vents

2014 FBC - Building, 5th edition > 30 Elevators and Conveying Systems > 3004 Hoistway Venting > 3004.3 Area of Vents
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Except as provided for in Section 3004.3.1, the area of the vents shall be not less than 31/2 percent of the area of the hoistway nor less than 3 square feet (0.28 m2) for each elevator car, and not less than 31/2 percent nor less than 0.5 square feet (0.047 m2) for each dumbwaiter car in the hoistway, whichever is greater. Of the total required vent area, not less than one-third shall be permanently open. Closed portions of the required vent area shall consist of openings glazed with annealed glass not greater than 1/8 inch (3.2 mm) in thickness.

Exception: The total required vent area shall not be required to be permanently open where all the vent openings automatically open upon detection of smoke in the elevator lobbies or hoistway, upon power failure and upon activation of a manual override control. The manual override control shall be capable of opening and closing the vents and shall be located in an approved location.

3004.3.1 Reduced Vent Area

Where mechanical ventilation conforming to the Florida Building Code, Mechanical is provided, a reduction in the required vent area is allowed provided that all of the following conditions are met:

  1. The occupancy is not in Group R-1, R-2, I-1 or I-2 or of a similar occupancy with overnight sleeping units.
  2. The vents required by Section 3004.2 do not have outside exposure.
  3. The hoistway does not extend to the top of the building.
  4. The hoistway and machine room exhaust fan is automatically reactivated by thermostatic means.
  5. Equivalent venting of the hoistway is accomplished.

Related Code Sections


3004.3 Elevators and Conveying Systems, Area of Vents
Except as provided for in Section 3004.3.1, the area of the vents shall be not less than 3 1 / 2 percent of the area of the hoistway nor less than 3 ...
2014 FBC - Building, 5th edition > 30 Elevators and Conveying Systems > 3004 Hoistway Venting > 3004.3 Area of Vents
B305.3.1 Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction, Vent Area
The crawl space vents shall have a total area equal to either: At least 1/150 of the area enclosed by the crawl space if the crawl space is exposed ...
2020 FBC - Building, 7th edition > B Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction > B301 Construction Requirements for Passive Radon Control > B305 Buildings With Crawl Spaces > B305.3 Crawl Space Ventilation > B305.3.1 Vent Area
F305.3.1 Florida Standard for Passive Radon-Resistant New Residential Building Construction, Vent Area
The crawl space vents shall have a total area equal to either: at least 1 / 150 of the area enclosed by the crawl space if the crawl space ...
2017 FBC - Residential, 6th edition > F Florida Standard for Passive Radon-Resistant New Residential Building Construction > F305 Buildings With Crawl Spaces > F305.3 Crawl Space Ventilation > F305.3.1 Vent Area
F305.3.1 Florida Standard for Passive Radon-Resistant New Residential Building Construction, Vent Area
The crawl space vents shall have a total area equal to either: at least 1 / 150 of the area enclosed by the crawl space if the crawl space ...
2020 FBC - Residential, 7th edition > F Florida Standard for Passive Radon-Resistant New Residential Building Construction > F305 Buildings With Crawl Spaces > F305.3 Crawl Space Ventilation > F305.3.1 Vent Area
504.2.8 Chimneys and Vents, Vent Area and Diameter
capacity, and the connector diameter shall be used to determine the maximum vent capacity. The flow area of the vertical vent shall not exceed seven times ...
2014 FBC - Fuel Gas, 5th edition > 5 Chimneys and Vents > 504 (IFGS) Sizing of Category I Appliance Venting Systems > 504.2 Application of Single-Appliance Vent Tables 504.2(1) Through 504.2(6) > 504.2.8 Vent Area and Diameter
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