{"product_id":"southwark-metal-17_20x8-16x8-trunk-duct-transition-20x8-to-16x8","title":"Southwark Metal 17_20X8-16X8 Trunk Duct Transition 20x8 to 16x8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOUTHWARK METAL 17_20X8-16X8 is a sheet metal trunk duct transition reducer designed to step down a rectangular duct from 20 inches x 8 inches to 16 inches x 8 inches. Fabricated from hot dip galvanized steel, this fitting provides a tapered-to-one-side offset reduction, keeping one face of the duct flush while the taper occurs on the opposing side. This geometry is common in residential and light commercial forced-air systems where trunk duct runs must reduce in cross-section as supply air is distributed downstream. HVAC sheet metal installers and mechanical contractors use this fitting during new construction and retrofit duct fabrication work.\u003c\/p\u003e\n\u003cp\u003eThis transition fits into rectangular trunk duct systems sized at 20 inches x 8 inches on the inlet side, reducing to 16 inches x 8 inches on the outlet side. The tapered-to-one-side design is particularly useful in tight ceiling or floor joist cavities where a centered concentric reducer would not clear obstructions. It is appropriate for low-pressure supply or return trunk applications in residential and light commercial forced-air HVAC installations. Fabrication meets ACCA and SMACNA standards, which govern duct construction quality and dimensional consistency across the trade.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eReduces trunk duct from 20 inches x 8 inches to 16 inches x 8 inches in a single fitting\u003c\/li\u003e\n  \u003cli\u003eTapered to one side, keeping one duct face flush for easier installation in confined spaces\u003c\/li\u003e\n  \u003cli\u003eConstructed from hot dip galvanized steel for corrosion resistance in HVAC duct environments\u003c\/li\u003e\n  \u003cli\u003eFabricated to ACCA and SMACNA standards for consistent dimensional quality\u003c\/li\u003e\n  \u003cli\u003eSuited for residential and light commercial rectangular trunk duct systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style sheet metal fitting for rectangular trunk duct systems with a 20 inches x 8 inches inlet and a 16 inches x 8 inches outlet. Compatible with standard rectangular duct sections and accessories that conform to SMACNA dimensional specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or sheet metal contractor following SMACNA duct construction guidelines. Shut down the air handling unit and de-energize the system before connecting or disconnecting duct sections. Secure the fitting to adjacent duct with sheet metal screws and seal all joints with UL 181-listed foil tape or mastic to maintain system pressure integrity. Verify that the tapered side is oriented correctly within the available clearance before finalizing fasteners.\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\u003eInlet Size (Size A)\u003c\/strong\u003e: 20 inches x 8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutlet Size (Size B)\u003c\/strong\u003e: 16 inches x 8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTaper Type\u003c\/strong\u003e: Tapered to One Side\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: 17_20X8-16X8\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51284136526130,"sku":"17_20X8-16X8","price":77.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309277222.jpg?v=1781069476","url":"https:\/\/voomisupply.com\/products\/southwark-metal-17_20x8-16x8-trunk-duct-transition-20x8-to-16x8","provider":"Voomi Supply","version":"1.0","type":"link"}