{"product_id":"westinghouse-903660-furnace-roof-jack-27-47-in-aluminized-steel","title":"Westinghouse 903660 Furnace Roof Jack 27-47 in Aluminized Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe WESTINGHOUSE 903660 is an aluminized steel furnace roof jack designed for venting residential gas furnaces through the roof. This non-transit unit provides an adjustable length range of 27 to 47 inches, allowing installers to accommodate varying roof depths and rafter configurations without cutting to a fixed dimension. The included flat flashing with a 12-inch rise is integrated into the assembly, creating a weather-tight seal at the roof deck penetration. Licensed HVAC technicians and sheet metal contractors typically handle this type of B-vent termination hardware during new installations and replacements.\u003c\/p\u003e\u003cp\u003eThis roof jack is specified for use with MG, MB, MS, MM, and M1 series furnace applications. Its adjustable length makes it well suited for residential installations where attic depth or rafter spacing varies from one structure to the next. The flat flashing profile is appropriate for low-slope or flat roof installations where the 12-inch rise provides adequate clearance and drainage diversion at the penetration point. The aluminized steel construction resists the high-temperature flue gases and condensation common in residential forced-air gas furnace venting systems.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAdjustable length from 27 to 47 inches to fit varying roof depths and rafter configurations\u003c\/li\u003e\n\u003cli\u003eAluminized steel construction for resistance to heat and flue gas condensation\u003c\/li\u003e\n\u003cli\u003eIntegrated flat flashing with 12-inch rise for a weather-tight roof penetration seal\u003c\/li\u003e\n\u003cli\u003eNon-transit design for permanent installation applications\u003c\/li\u003e\n\u003cli\u003eCompatible with MG, MB, MS, MM, and M1 series furnace venting configurations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eSpecified for MG, MB, MS, MM, and M1 series furnace applications requiring a roof jack termination assembly with flat flashing.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation of this roof jack must be performed by a qualified HVAC technician or licensed contractor in accordance with the International Fuel Gas Code (IFGC) and local amendments. Shut down and lock out the furnace before beginning any work on the venting system. The flashing must be properly integrated with the roofing material to prevent water infiltration at the penetration point. Confirm that the final installed length, flue clearances, and termination height meet the appliance manufacturer specifications and local code requirements before returning the system to service.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Length\u003c\/strong\u003e: 27 to 47 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Aluminized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlashing Type\u003c\/strong\u003e: Flat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlashing Rise\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Type\u003c\/strong\u003e: Non-Transit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: WESTINGHOUSE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 903660\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WESTINGHOUSE","offers":[{"title":"Default Title","offer_id":51268903338290,"sku":"903660","price":258.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/308912812.jpg?v=1780709251","url":"https:\/\/voomisupply.com\/products\/westinghouse-903660-furnace-roof-jack-27-47-in-aluminized-steel","provider":"Voomi Supply","version":"1.0","type":"link"}