Williams 9304 Vent Extension 320074-702 Combustion Precision: Includes factory-calibrated LP

Combustion Precision: Includes factory-calibrated LP conversion orifices to maintain proper air-to-fuel ratios

Optimized Airflow Control: Features adjustable blower-off delay settings to maximize heat exchanger efficiency and residential comfort

Contractor Grade Durability: Built to OEM specifications for long-cycle reliability in outdoor environments subjected to extreme temperature fluctuations

providing sufficient length for standard blower wheel hubs

Williams 9304 Vent Extension 320074-702 Combustion Precision: Includes factory-calibrated LPThe Williams 9304 Vent Extension is a critical component for completing through the wall installations of Direct Vent (DV) Wall Furnaces. This 15 inch extension is engineered specifically for the Williams 14038 Series (14,000 BTU models), including compatible Mfr. Nos. 1403821 and 1403822. When standard vent lengths are insufficient due to structural depth, this kit accommodates wall thicknesses from 9 inches up to 15 inches. Constructed from heavy