On a project that we are finishing up the AHU has two sets of filters - MERV 8 prefilter then a MERV 13 main filter. Are the prefilters required to be MERV 13 as well? I'm assuming that the MERV 8 prefilter is fine since the main filter is a MERV 13 but from what I can tell in IEQ 5 it just says all filters and doesn't differentiate between the two.
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