We have a project with 3 lobbies located in basement parking. The lobbies are not regularly occupied spaces, but are circulation spaces connecting to the main reception and lobby on the Ground floor via lifts and a staircase. The main reception and lobby are being supplied with outdoor air. Do we need to supply outdoor air to the basement lobbies?

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Andrew Mitchell, P.E.

Principal

Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

97 thumbs up

Wed, 04/15/2015 - 15:10

Your description does not really illustrate how the basement lobby is connected to the ground floor or to the parking garage itself. Based on the description above though, you should comply with ASHRAE 62.1-207 requirements for lobby ventilation.

Marni Punt

Associate

Aurecon

LEEDuser Basic Member

0 thumbs up

Mon, 04/20/2015 - 12:11

Hi Andrew, thank you for your reply. The lobbies in question are linked with a communication staircase that leads all the way up to the roof so there will be adequate ventilation of these lobbies through the upper ventilated levels,also these basement lobbies have self-closing doors installed on each basement level .The basements are being CO2 monitored to ensure that there is no build-up of toxic gasses and is ventilated accordingly. The basements where the small lift lobbies are located are purely for parking and as I understand ASHREA only addresses occupied spaces. So in essence we are debating the definition of Lobbies?

Devendra Chaughule

Senior Manager - Sustainable Services

Surmount

LEEDuser Basic Member

29 thumbs up

Fri, 04/28/2023 - 05:27

Dear Marni, How were you able to address this issue to the reviewer? were you able to explain him that basement lobbies are going to not a occupied space and doest not required fresh air requirement as well as MERV filters for credit compliance? Please let me know Regards Devendra C.

Andrey Kuznetsov

ESG consultant, LEED AP BD+C

Self Employed

LEEDuser Basic Member

36 thumbs up

Sat, 04/29/2023 - 20:07

According to ASHRAE you need or to pressurize this lobbies in order to prevent parking lot air with contaminants to leak further into the main space of the building, or make vestibule with air lock, or any other means to prevent exhaust gases to migrate from garage into a building. Refer to para 5.16 at ASHRAE 62.1-2007 or para 5.15 at ASHRAE 62.1-2010.

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