About hvac system cleaning
WG stands for Water Gauge. WG is an element on the measurement unit with the stress of fan and pump. IN.WG which stands for inch water gauge is definitely the Imperial unit for pressure. For instance, ducts are Commonly designed with 0.1 in.wg of pressure loss for each one hundred ft of duct length.MFD means Motorized Fireplace Damper. MFD can be a