I'm working on a FIre Station with a 7500 sq. ft. apparatus bay. The bay is approximately 75' X 100' with (3) 195 sq. ft. doors on each of the long ends (6 doors total). Ceiling Height is 20'. There is a vehicle exhaust system which captures vehicle exhaust each time a vehicle is operated. The ratio of garage door area to floor area is 15.5%, but we do not meet the prescriptive requirement of all spaces being within 25 ft. of the openings. Questions: 1) Are we required to calculate ventiltion for an apparatus bay? 2) Is the AM10CalcToolV5 considered sufficient for these calcultions? 3) WHat is required to establish the air change rate required in the tool? 4) Are there any instructions on use of this spreadsheet tool? All help greatly appreciated!

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Roger Chang

Principal, Energy and Engineering Leader

DLR Group | Westlake Reed Leskosky

LEEDuser Expert

267 thumbs up

Thu, 10/11/2012 - 18:01

Chris, Does the vehicle exhaust system function when the apparatus bay doors are closed? If so, it seems like it would make sense to provide some mechanical ventilation to the bay. The AM10 tool is meant to assist with sizing openings to maintain thermal comfort in a space. A designer would estimate the heat load in a space and determine the number of air changes per hour needed to keep the temperature from exceeding a certain value. In your case, ventilation is only meant to control pollutants - you could select an air change rate that corresponds to the current requirement for exhaust from enclosed parking garages in the International Mechanical Code (0.75 cfm/sf).

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