{"product_id":"southwark-metal-usbr81958215818-unit-support-box-r-8-insulation-19-5-8-inches-x-21-5-8-inches-x-18-inches","title":"Southwark Metal USBR81958215818 Unit Support Box R-8 Insulation 19 5\/8 Inches X 21 5\/8 Inches X 18 Inches","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Southwark Metal USBR81958215818 is a unit support box designed for use in residential and light commercial HVAC duct systems. It measures 19 5\/8 inches wide by 21 5\/8 inches deep by 18 inches tall. This support box features R-8 insulation built into its construction, helping to reduce heat loss and heat gain as conditioned air moves through the duct system. A higher R-value means better thermal resistance, which is critical in attic installations and other unconditioned spaces where temperature extremes can reduce system efficiency. HVAC installers and sheet metal contractors rely on unit support boxes like this one to create a stable, insulated transition point where an air handler or fan coil unit connects to the duct system. The box supports the weight of the unit above while maintaining a sealed, thermally efficient air path. Southwark Metal is a well-established manufacturer of sheet metal HVAC products, trusted by professionals for consistent quality and dimensional accuracy. The USBR81958215818 is a fixed, non-adjustable unit, meaning it is built to specific dimensions without telescoping or adjustable components. This makes it a reliable choice when exact sizing is already confirmed during the design or replacement phase of a project. The R-8 insulation rating meets energy code requirements common in many jurisdictions, making this box suitable for new construction and retrofit applications alike. Whether you are replacing a worn support box or installing a new system, this unit provides the structural support and insulation performance needed to keep the system running efficiently. Trade professionals will appreciate the precise fit and durable sheet metal construction.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eR-8 insulation rating for high thermal resistance in unconditioned spaces\u003c\/li\u003e\n\u003cli\u003eFixed dimensions of 19 5\/8 inches x 21 5\/8 inches x 18 inches for precise, confirmed installations\u003c\/li\u003e\n\u003cli\u003eDurable sheet metal construction from Southwark Metal, trusted by HVAC trade professionals\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Southwark Metal USBR81958215818 unit support box delivers R-8 insulated performance in a fixed, trade-ready form factor sized at 19 5\/8 inches x 21 5\/8 inches x 18 inches. It is built for reliable use in residential and light commercial HVAC duct system installations.\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: USBR81958215818\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulated\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Rating\u003c\/strong\u003e: R-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 19 5\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepth\u003c\/strong\u003e: 21 5\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51121071751474,"sku":"USBR81958215818","price":104.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304885091.webp?v=1777747562","url":"https:\/\/voomisupply.com\/products\/southwark-metal-usbr81958215818-unit-support-box-r-8-insulation-19-5-8-inches-x-21-5-8-inches-x-18-inches","provider":"Voomi Supply","version":"1.0","type":"link"}