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EBOM-2009 IEQp1:Minimum IAQ Performance

Public Corridors Lack Ventilation

I’m dealing with a building that generally meets ASHRAE 62.1, however several public corridors are unconditioned and unventilated. The corridors do not have the minimum 0.06 cm/sf required per ASHRAE 62.1. I want to ensure the building meets prereq requirements, but I also want to avoid suggesting unnecessary and costly changes in the air distribution system. I have the following questions: 1) All AHUS could comply through Case B by providing at least 10 cfm per person. However, I’m unclear on the circumstances in which a reviewer will accept Case B in place of Case A. Would the reviewers come back and say we need to add supply registers in the corridor? 2) Several corridors are flanked on both sides by offices with outdoor air flow rates that exceed ASHRAE 62.1. Could I claim “credit” for air mixing from adjacent rooms? Thanks in advance!

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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Fri, 04/11/2014 - 19:49

1) I don't think the reviewer would require that you add ductwork or diffusers to a system to comply with Case A. 2) If there are no closed doors between the offices and the corridors, it might be reasonable to divide the corridors into parts to be included in the same ventilation zone with an adjacent office. In this case the square footage area of the office zone would be increased but the population would not be increased; the entire area would be defined as "office" for purposes of the ventilation calculations. This would model the air supplied to the office as being shared between the office and its adjacent circulation corridor.

Mon, 02/22/2016 - 00:39

1)We have a similar case in a 20-story building in Mexico. Lift lobbies lack ventilation but the UMAs serving each floor provide more than 10cf per person. Will this be accepted by the LEED reviewer to comply with case B? Thank you
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Ben Stanley
Senior Sustainability Manager
WSP - Built Ecology
LEEDuser Expert
188 thumbs up

Thu, 03/03/2016 - 22:43

Somehow, you'll need to show that those lift lobbies receive ventilation air. One possibility would be if there's a pressure differential between the lift lobby and adjacent ventilated spaces, and there's a path for mixed/ventilated air to travel between the two spaces, you could show that it's reasonable to expect that ventilated air would reach those spaces.

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