{"product_id":"southwark-metal-21r8201612-model-21-end-cap-r8-insulation","title":"Southwark Metal 21r8201612 Model 21 End Cap R8 Insulation","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SOUTHWARK METAL 21r8201612 is a Model 21 rectangular duct end cap with R8 insulation, measuring 20 inches by 16.5 inches. Constructed from hot-dipped galvanized steel meeting ASTM A653 CS Type B at 26 gauge, this end cap provides a durable, corrosion-resistant closure for insulated rectangular ductwork. The S-Lock drive-type connection ensures a secure fit during installation. It is sold as a single unit and is intended for use by licensed HVAC technicians on commercial and residential forced-air duct systems requiring insulated end terminations.\u003c\/p\u003e\u003cp\u003eThis end cap is suited for insulated rectangular duct assemblies in both residential and light commercial HVAC applications. It is typically installed at duct termination points where a sealed, insulated closure is required to maintain system efficiency and meet energy code requirements. The R8 insulation level makes it appropriate for unconditioned spaces such as attics, crawlspaces, and mechanical rooms where higher thermal resistance is specified.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHot-dipped galvanized steel construction per ASTM A653 CS Type B for corrosion resistance\u003c\/li\u003e\n\u003cli\u003e26 gauge steel for structural rigidity in duct termination applications\u003c\/li\u003e\n\u003cli\u003eR8 insulation rating suitable for unconditioned space installations\u003c\/li\u003e\n\u003cli\u003eS-Lock drive-type connection for secure duct attachment\u003c\/li\u003e\n\u003cli\u003eCompatible with S-cleat fastening method\u003c\/li\u003e\n\u003cli\u003eAvailable in R4, R6, and R8 insulation options within the Model 21 product line\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and standard fit for Model 21 insulated rectangular duct systems using S-Lock drive and S-cleat connections.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified HVAC technician in accordance with SMACNA duct construction standards and applicable local mechanical codes. Disconnect and lock out power to the air handling system before beginning duct work. S-Lock drive connections should be fully engaged and sealed per project specifications. Sheet metal gloves and appropriate hand tools are recommended when handling 26 gauge galvanized steel components.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\u003c\/strong\u003e: 21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: End Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 20 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 16.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Rating\u003c\/strong\u003e: R8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGauge\u003c\/strong\u003e: 26\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Hot-Dipped Galvanized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Standard\u003c\/strong\u003e: ASTM A653 CS Type B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Type\u003c\/strong\u003e: S-Lock Drive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit of Measure\u003c\/strong\u003e: Each\u003c\/li\u003e\n\u003c\/ul\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: 21r8201612\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51383271522610,"sku":"21R8201612","price":30.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312674488.webp?v=1782591778","url":"https:\/\/voomisupply.com\/products\/southwark-metal-21r8201612-model-21-end-cap-r8-insulation","provider":"Voomi Supply","version":"1.0","type":"link"}