{"product_id":"sheet-metal-products-inc-421-161616-duct-transition","title":"Sheet Metal Products Inc 421-161616 Duct Transition","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SHEET METAL PRODUCTS INC 421-161616 is a square-to-round duct transition designed to connect a 16 x 16 inch square duct section to a 16 inch round duct section. This fitting is a standard component in low-pressure supply and return air distribution systems. HVAC technicians and sheet metal installers use this transition when a trunk line or plenum with a square or rectangular opening needs to feed into a round branch duct or flexible duct run. The part is sold as a single unit and is fabricated for direct field installation.\u003c\/p\u003e\u003cp\u003eThis transition is suited for residential and light commercial forced-air systems where square-to-round connections are required at air handlers, furnaces, or inline duct junctions. It is appropriate for installations where a 16 x 16 inch square collar mates to a 16 inch round duct, flex duct connector, or round takeoff fitting. No listed compatible model numbers or system families were provided in the product data.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSquare-to-round configuration allows connection between square and round duct sections\u003c\/li\u003e\n\u003cli\u003e16 x 16 inch square end matches standard trunk and plenum collar sizes\u003c\/li\u003e\n\u003cli\u003e16 inch round end accepts standard round duct and flex duct connections\u003c\/li\u003e\n\u003cli\u003eSold as a single unit for individual fitting replacement or new installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style sheet metal fitting for residential and light commercial forced-air duct systems requiring a 16 x 16 inch square-to-16 inch round transition.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by a licensed HVAC technician or qualified sheet metal mechanic. Power down the air handling unit and verify the system is de-energized before cutting into or modifying ductwork. Secure the fitting using sheet metal screws and seal all joints with UL 181-rated foil tape or mastic sealant per local mechanical code requirements. Do not compress or restrict the round end opening during installation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type\u003c\/strong\u003e: Square-to-Round Duct Transition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare End Size\u003c\/strong\u003e: 16 x 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound End Size\u003c\/strong\u003e: 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelling Unit\u003c\/strong\u003e: Single\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SHEET METAL PRODUCTS INC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 421-161616\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"METALS","offers":[{"title":"Default Title","offer_id":68079728197938,"sku":"421-161616","price":47.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d4283c883c2c50600a0294c292a51f8d_0ad58f0c-94cb-49ab-8ea9-8f546f0805ea.jpg?v=1793126435","url":"https:\/\/voomisupply.com\/products\/sheet-metal-products-inc-421-161616-duct-transition","provider":"Voomi Supply","version":"1.0","type":"link"}