S1-7900A6111 80% Furnace Accessory Roof Jack and Accessories 11" Interior Extension Description 11" Interior roof jack extension Product Specifications Description 11" Interior Extension Wt. Lbs. 27 Shipping Weight 28.35 Shipping Width 8.40 Shipping Length 8.40 Shipping Height 14.30 OEM Roof Jack Accessory | 11‑Inch Interior Extension | For 80% Mobile Home Furnaces The 7900A6111 is an OEM interior extension section designed for use with Coleman / York 80% furnace roof jack systems. This 11‑inch extension increases the interior length of the roof jack assembly, ensuring proper vent alignment, safe exhaust clearance, and correct installation height for manufactured and mobile home applications. Key Features OEM Coleman / York roof jack accessory 11" interior extension for 80% furnaces Ensures proper vent height and alignment Heavy‑gauge galvanized construction Designed for mobile and manufactured home installations Direct‑fit component for compatible roof jack assemblies Function & Application This interior extension is used to adjust the total length of the roof jack assembly inside the home. Proper roof jack height is critical for: Safe venting of combustion gases Maintaining correct draft Preventing condensation and backdraft issues Meeting installation code requirements The 7900A6111 is commonly used when replacing or installing 80% furnaces where ceiling height or roof pitch requires additional interior length. Product Details Part Number: 7900A6111 Component Type: Interior roof jack extension Length: 11 inches Application: 80% mobile home furnaces OEM Brand: Coleman / York
