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Filter For Heater Vent . Vent filters are useful for more than just air conditioners; The vent filter is an essential. Order HVAC Furnace Register Vent Charcoal Carbon Filters 4" x 12" from www.airfilterllc.com The accord vent replacement filter. Getting the ductwork checked and repaired is the best. It should face the unit (away from the return vent).