Can we now fully ignore how many floors an air handling unit (AHU) serves when determining how many air quality testing samples are required?
For instance, I have an AHU that serves approximately 40,000 square feet which is split evenly between four floors (i.e., 10,000 square feet per floor). Would I need only 2 tests since my total floor area is less than 50,000 square feet?
Here is the old language for quick reference (emphasis is my own): "For each portion of the building served by a separate ventilation system, the number of sampling points must not be less than 1 per 25,000 square feet or for each contiguous floor area, whichever is larger. Include areas with the least ventilation and greatest presumed source strength."
Her is the new language: "The number of sampling locations must include the entire building and all representative situations."
By the way, the "25,000 square feet" language was also removed but I assume that still applies because I see it in the Implementation section of my Reference Guide hard copy. I'm also aware that the v4 Step-by-Step Guidance seems to explain the phase "include the entire building and all representative situations". However, my project is under v2009 so I'm assuming that v4 information doesn't strictly apply.