{"product_id":"southwark-metal-21r82016-end-cap-r8-20x16-in","title":"Southwark Metal 21r82016 End Cap R8 20x16 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SOUTHWARK METAL 21r82016 is a Model 21 duct end cap with R8 insulation, sized at 20 inches by 16 inches. It is fabricated from hot-dipped galvanized steel conforming to ASTM A653 CS Type B at 26 gauge. The S-Lock drive-type connection provides a secure mechanical fit for rectangular ductwork terminations. This end cap is used to seal the open end of an insulated duct run and is installed by sheet metal workers and HVAC technicians during new construction or duct modification work.\u003c\/p\u003e\u003cp\u003eThis end cap is suited for residential and light commercial HVAC ductwork applications where insulated rectangular duct systems require a sealed termination. The R8 insulation rating makes it appropriate for installations in unconditioned spaces such as attics, crawlspaces, and exterior wall chases where thermal performance requirements are higher. It connects using an S-Lock drive-type joint and is also available with S-cleat fastening. Insulation options of R4 and R6 are available in the same model family for applications with different thermal requirements.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eHot-dipped galvanized steel per ASTM A653 CS Type B for corrosion resistance\u003c\/li\u003e\n\u003cli\u003e26 gauge steel construction for rigid, durable duct termination\u003c\/li\u003e\n\u003cli\u003eR8 insulation rating suitable for unconditioned space installations\u003c\/li\u003e\n\u003cli\u003eS-Lock drive-type connection for a secure mechanical fit\u003c\/li\u003e\n\u003cli\u003eAvailable with S-cleat fastening as an alternative connection method\u003c\/li\u003e\n\u003cli\u003eCompatible insulation options include R4 and R6 in the same model family\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and standard component for Model 21 insulated rectangular ductwork systems using S-Lock drive connections. Also available in R4 and R6 insulation variants within the same product family.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by licensed sheet metal workers or HVAC technicians. Shut down the air handling system before making duct modifications or installing end caps. Ensure the S-Lock or S-cleat connection is fully seated and sealed per applicable SMACNA ductwork standards. Follow local mechanical codes for duct insulation continuity requirements at termination points.\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\u003eDimensions\u003c\/strong\u003e: 20 inches x 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Rating\u003c\/strong\u003e: R8\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\u003eGauge\u003c\/strong\u003e: 26\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: 21r82016\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51383805804850,"sku":"21R82016","price":30.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312674487.webp?v=1782607879","url":"https:\/\/voomisupply.com\/products\/southwark-metal-21r82016-end-cap-r8-20x16-in","provider":"Voomi Supply","version":"1.0","type":"link"}