I have a main Fresh Aish Handling Unit (FAHU) that supplies fresh air to all FCUs. I need to know if I should calculate flush out on zone by zone basis, in which flushing the whole building will take the time needed by the zone with the highest needed time. Or I can just add all zone areas together, keep them open during flush-out, and calculate the time based on the FAHU capacity for the whole floor area.
Advise would be highly appreciated,
Tien Duong
LEED AP BD+C, PM / Energy Modeler1 thumbs up
March 31, 2020 - 4:48 am
It should be one by one, because the intent of this credit to provide sufficient fresh air into each space, then ensure the contaminant no longer exist in each space via each square footage.
Susan Di Giulio
Senior Project ManagerZinner Consultants
152 thumbs up
March 23, 2022 - 1:54 pm
I am confused about this. While I always understood that the requirement was as Mr Duong described, the example given in the LEED BD+C v4 guidebook clearly states that you only need to use the total GSF and a default air input of 0.7 cubic feet/minute. I don't want to continue making GCs and engineers do extra work. Exactly what are LEED reviewers looking for?