Parking garage exhaust air rate - LEED CS v3

Francesco Allaix

L Arkkitehdit

LEEDuser Basic Member

10 thumbs up

March 27, 2015

Hello, Our project has an underground parking garage. It is a non-occupied space since no one is working there. I could not find any parking or similar space in the Space Matrix (Oct 2013) table, so I'm not sure how to go about it. But, the Space Matrix states in Allowed Exclusions column, for IEQp1/IEQ2: "Nonoccupied spaces and restrooms are excluded from the Ventilation Rate Procedure (or natural ventilation) requirements". Does it mean than our parking garage is excluded from any calculation in IEQp1 and IEQ2? ASHRAE 62.1 defines a minimum exhaust air rate for parking garages, but the above statement overrides it in case of non-occupied parking garages, right? Thanks for your help!

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Dave Hubka

Practice Leader - Sustainability

EUA

LEEDuser Expert

510 thumbs up

Thu, 04/02/2015 - 21:08

enclosed parking garages will need to comply with the exhaust rate listed in table 6-4 of ASHRAE 62.1.

Francesco Allaix

L Arkkitehdit

LEEDuser Basic Member

10 thumbs up

Fri, 04/10/2015 - 09:26

Could you elaborate? Why the Space Matrix would not apply to parking garage?

Dave Hubka

Practice Leader - Sustainability

EUA

LEEDuser Expert

510 thumbs up

Fri, 04/10/2015 - 12:41

The requirements of EQp1 outlined within the LEED reference guide require the project team to meet the minimum requirements of Sections 4 through 7 of ASHRAE 62.1. Section 6.2.8 of the standard requires exhaust per Table 6-4. Parking Garages are listed in this table and require an exhaust rate of 0.75 cfm/square foot. Similar to restrooms, parking garages are excluded from the ventilation rate procedure. However they are not excluded from the exhaust requirements outlined in Table 6-4. I hope this provides better guidance.