The hvac system cleaning Diaries
WG stands for Water Gauge. WG is part in the measurement device for the pressure of enthusiast and pump. IN.WG which means inch h2o gauge may be the Imperial device for stress. By way of example, ducts are Usually designed with 0.one in.wg of stress reduction for every one hundred ft of duct size.BDD means Backdraft Damper. BDD is applied to ensure