Second Public Comment Period for LEED® NC 2.2

WASHINGTON, D.C.—The U.S. Green Building Council (USGBC) is soliciting comments on the second draft of the LEED for New Construction Rating System (LEED-NC), version 2.2. The second public comment period will be open until July 30 at 5 p.m. Pacific Daylight Time.

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LEED IAQ - Part II

In the LEED-NC Version 2.2 EQ Credit 3.2: Construction IAQ Management Plan - Before Occupancy (which is in public review) the requirements for the 2-week flush-out are being more defined. Now during the flush-out, the user has to deliver a certain volume of air per square foot of floor area while maintaining an internal temperature and relative humidity.

Below are the actual requirements (remember this is from the LEED-NC version 2.2 which is under public draft at the time of this post)

After construction ends, prior to occupancy and with all interior finishes installed, install new filtration media and perform a building flush-out by supplying a total air volume of 14,000 ft3 of outdoor air per ft2 of floor area while maintaining an internal temperature of at least 60 degrees F and, where mechanical cooling is operated, relative humidity no higher than 60%.
OR
If occupancy is desired prior to completion of the flush-out, the space may be occupied following delivery of a minimum of 3,500 ft3 of outdoor air per ft2 of floor area to the space, and provided the space is ventilated at a minimum rate of 0.30 cfm/ft2 of outside air or the design minimum outside air rate, whichever is greater, a minimum of three hours prior to occupancy and during occupancy, until a total of 14,000 ft3/ft2 of outside air has been delivered to the space.