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WG means H2o Gauge. WG is an element with the measurement device for the tension of admirer and pump. IN.WG which stands for inch h2o gauge would be the Imperial device for tension. One example is, ducts are Generally designed with 0.1 in.wg of stress decline for each a hundred ft of duct duration.MFD means Motorized Hearth Damper. MFD is usually a