{"product_id":"southwark-metal-28_3-1-4x12x8-duct-wall-stack-end-boot","title":"Southwark Metal 28_3-1\/4X12X8 Duct Wall Stack End Boot","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOUTHWARK METAL 28_3-1\/4X12X8 is a sheet metal duct wall stack end boot that transitions a rectangular duct opening to a round collar. The rectangular inlet measures 3.25 inches by 12 inches, and the round outlet measures 8 inches in diameter. Fabricated from hot-dip galvanized steel, this fitting resists corrosion in typical residential and light commercial forced-air duct systems. HVAC installers and sheet metal mechanics use this fitting where a wall stack duct terminates and connects to a round branch or flex runout. The rectangular-to-round geometry makes it a standard component in floor-to-wall and wall-stack supply duct layouts.\u003c\/p\u003e\n\u003cp\u003eThis end boot is suited for residential and light commercial HVAC duct systems where a wall stack supply outlet must transition to an 8-inch round connection. It fits into framed wall cavities as a stack duct termination, connecting the flat rectangular duct chase to a round collar that feeds a register boot, flex duct, or hard-pipe runout. It is appropriate for new construction and replacement work in forced-air heating and cooling systems built to ACCA and SMACNA standards.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eRectangular inlet measures 3.25 inches by 12 inches for standard wall stack applications\u003c\/li\u003e\n  \u003cli\u003e8-inch round outlet connects to round duct, flex duct, or branch fittings\u003c\/li\u003e\n  \u003cli\u003eHot-dip galvanized steel construction provides corrosion resistance in conditioned air environments\u003c\/li\u003e\n  \u003cli\u003eRectangular-to-round transition geometry suits floor-to-wall and wall-stack duct layouts\u003c\/li\u003e\n  \u003cli\u003eFabricated to ACCA and SMACNA applicable standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style sheet metal fitting for residential and light commercial forced-air duct systems using wall stack configurations with a 3.25-inch by 12-inch rectangular inlet and an 8-inch round outlet.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or sheet metal mechanic in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handler or furnace before accessing or modifying duct connections. Secure all joints with sheet metal screws and seal with listed duct sealant or metal-backed tape per applicable code. Do not compress or deform the fitting during installation, as this will restrict airflow and affect system balance.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Hot-Dip Galvanized Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRectangular Inlet (Size A)\u003c\/strong\u003e: 3.25 inches x 12 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRound Outlet (Size B)\u003c\/strong\u003e: 8 inches diameter\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Stack, Rectangular to Round\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplicable Standards\u003c\/strong\u003e: ACCA, SMACNA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SOUTHWARK METAL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 28_3-1\/4X12X8\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51284109459762,"sku":"28_3-1\/4X12X8","price":26.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309277036.jpg?v=1781068747","url":"https:\/\/voomisupply.com\/products\/southwark-metal-28_3-1-4x12x8-duct-wall-stack-end-boot","provider":"Voomi Supply","version":"1.0","type":"link"}