Alok Verma
Apr 23, 2016, 06:14 PM
According to SMACNA -duct leakage test manual, It is not recommended that duct system constructed to 3" (750Pa) wg class or lower be tested. My question is "what is 3" (750Pa) wg class?"
ma0641
Apr 23, 2016, 09:20 PM
A Pascal is a metric pressure measurement. Based on your post, 3" water guage is equal to 750 pascals ( 1" is 250 Pa.) So any ductwork that is not constructed to these minimums 3" WG(water gauge) or 750 Pascals should not be tested. I would guess so as to not damage the duct work.