Williams 9303 Extension 326070-701 including models like F4807

including models like F4807

ensuring your HVAC control system receives accurate data for staging and modulation

Energy Efficiency: Enables the control board to make micro-adjustments to fan speed and staging

you must replace the existing 3/8" nut for 1/4" tubing with the included 7/16" nut to ensure a leak-proof seal

ensuring a clean break even after thousands of cycles

Williams 9303 Extension 326070-701 including models like F4807The Williams 9303 Extension is a professional grade 24 inch vent extension kit engineered specifically for direct vent gravity wall furnaces. This heavy duty galvanized steel vent extension is the standard solution for HVAC installers dealing with deep wall penetrations where standard venting falls short. It is designed for use with wall thicknesses ranging from 15 inches to 24 inches, ensuring a secure and code compliant flue path from the furnace to