We are currently working on an EBOM Retail project which is undergoing fit out works to the common mall and tenant areas. In order to comply with the credit requirements for building flush out, we would like to run our smoke spill fans before occupancy to meet the 3500ft3/ft2 requirement with the space ventilated at a minimum 0.3cfm/sqft and continue the process during occupancy (after operational hours). Since we will be using the smoke spill system for this flush out purpose, the cooling systems will not be operating during flush out. However, this will lead to higher indoor temperature and RH that exceeds the 60% requirement.

My question is, does the LEED requirement for "maintaining a relative humidity no higher than 60% where cooling mechanisms are operated" generally apply to any spaces that are typically cooled during operational hours, or does this mean the RH can be higher than 60% if the cooling systems are not operated during the flush out?

Also, it appears that LEED EBOM V4 allows IAQ Testing to be carried out as an option, so I was wondering if it might be possible for our LEED EBOM 2009 project to adopt this IAQ Test option? We will be doing a flush out at lower quantities in compliance to our local green building certification, after which we are quite certain the indoor air quality will be acceptable and can be justified through air quality test reports.

Appreciate any guidance/ answers on this.

Thank you!!