
Dose anyone have experience testing high velocity duct systems? I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts). I designed & installed a hydronic high velocity system a few years ago. It had 25' of 12" return flex duct, and 15-20' of 6+8" sheet metal ducting, 2 + 2-1/2" branch ducting. I sealed everything with mastic. I installed the duct tester at the return, a…
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