Designed for 6” ducts, the WhisperSupply-Wall FV-04WS1 ventilation model may be set to either 20 or 40 CFM and is ideal for weatherization efforts and addressing combustion appliance zone depressurization. Vented combustion appliances need to exhaust combustion by-products outside the home, and the 20/40 CFM model installed near the appliance will help supply fresh air in case CAZ depressurization back drafting occurs. It can be wired to work simultaneously with a furnace blower to supply air when it is needed.
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