{"product_id":"southwark-metal-73c1012191216-rectangular-to-round-transition-10-5-inches-x-19-5-inches-x-16-inches","title":"Southwark Metal 73C1012191216 Rectangular to Round Transition 10.5 Inches X 19.5 Inches X 16 Inches","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Southwark Metal 73C1012191216 is a rectangular to round transition fitting designed for use in residential and commercial HVAC ductwork systems. This fitting connects a rectangular duct opening measuring 10.5 inches by 19.5 inches to a round collar with a 16-inch diameter. It is part of Southwark's 73C product family, a well-known line of galvanized sheet metal transitions widely used by HVAC installers, sheet metal contractors, and mechanical contractors across the trade. The fitting is manufactured from hot dipped galvanized steel conforming to ASTM A653 CS Type B standards, ensuring resistance to corrosion and long service life in both supply and return air duct applications. The 28-gauge steel construction provides the structural rigidity needed for secure installation in air handling systems while remaining workable for field fitting and adjustment. The collar height on this fitting is approximately 3 inches, consistent with Southwark's standard collar height specification for fittings with 18-inch diameter and above. This transition is sold individually and is made in the USA. Rectangular to round transitions like this one are essential components when connecting rectangular trunk ducts or plenum boxes to round branch ducts or flex duct. They allow airflow to change cross-section geometry smoothly, helping maintain system static pressure and airflow efficiency. HVAC technicians rely on fittings like this during new construction, retrofit, and replacement jobs. The 73C1012191216 fits within a range of sizes from 6 inches by 6 inches through 20 inches by 20 inches available in the 73C line, making it easy to source matching fittings for a full duct system. This product is subject to California Proposition 65 requirements and is manufactured in the United States.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRectangular to round transition connects a 10.5 inches by 19.5 inches rectangular opening to a 16-inch round collar\u003c\/li\u003e\n\u003cli\u003eConstructed from 28-gauge hot dipped galvanized steel per ASTM A653 CS Type B for corrosion resistance and durability\u003c\/li\u003e\n\u003cli\u003eMade in the USA and sold individually, suitable for residential and commercial HVAC ductwork installations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Southwark Metal 73C1012191216 rectangular to round transition delivers reliable, corrosion-resistant performance in HVAC duct systems. Its 28-gauge galvanized steel construction and ASTM A653-compliant material make it a dependable choice for professional installers.\u003c\/p\u003e\u003ch3\u003eProduct Information\u003c\/h3\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 73C1012191216\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Family\u003c\/strong\u003e: 73C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Galvanized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGauge\u003c\/strong\u003e: 28 GA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuct Size\u003c\/strong\u003e: 10.5 inches x 19.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollar Diameter\u003c\/strong\u003e: 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 19.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 10.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.5 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanized Coating\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e: USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit of Measure\u003c\/strong\u003e: Each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProp 65\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51120878649650,"sku":"73C1012191216","price":77.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304885198.webp?v=1777742160","url":"https:\/\/voomisupply.com\/products\/southwark-metal-73c1012191216-rectangular-to-round-transition-10-5-inches-x-19-5-inches-x-16-inches","provider":"Voomi Supply","version":"1.0","type":"link"}