{"product_id":"southwark-metal-21r82020-duct-end-cap-r8-20x20","title":"Southwark Metal 21r82020 Duct End Cap R8 20x20","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SOUTHWARK METAL 21r82020 is a Model 21 insulated duct end cap rated R8, sized at 20 inches x 20 inches. It is fabricated from hot-dipped galvanized steel conforming to ASTM A653 CS Type B at 26 gauge, providing corrosion resistance in both residential and light commercial duct systems. The end cap features an S-Lock drive-type connection and is compatible with S-cleat installation. HVAC sheet metal technicians and duct installers use this component to seal the terminal end of a rectangular duct run, maintaining thermal efficiency and preventing air leakage at duct terminations.\u003c\/p\u003e\u003cp\u003eThis end cap is suited for rectangular duct systems requiring a thermally insulated closure. The R8 insulation value makes it appropriate for unconditioned spaces such as attics, crawlspaces, and mechanical rooms where energy code requirements demand higher insulation performance. The 20 x 20 inch face dimension accommodates larger trunk line terminations typical in residential and light commercial forced-air systems. Southwark also offers this Model 21 end cap in R4 and R6 insulation variants for applications with different thermal requirements.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR8 insulation rating for high-performance thermal closure of rectangular duct ends\u003c\/li\u003e\n\u003cli\u003e26-gauge hot-dipped galvanized steel per ASTM A653 CS Type B for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eS-Lock drive-type connection for secure field assembly\u003c\/li\u003e\n\u003cli\u003eCompatible with S-cleat installation method\u003c\/li\u003e\n\u003cli\u003eAvailable in R4 and R6 insulation variants within the same Model 21 product line\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style end cap for 20-inch x 20-inch rectangular duct systems using S-Lock drive and S-cleat connections. Compatible with R4, R6, and R8 insulated duct assemblies in the Southwark Model 21 product line.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal worker. Shut down the air handling system and verify zero static pressure in the duct before fitting the end cap. S-Lock drive connections should be fully seated and secured with the appropriate S-cleat prior to system restart. Follow local mechanical codes and SMACNA duct construction standards for sealing and insulation requirements in the applicable climate zone.\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\u003eFace Dimensions\u003c\/strong\u003e: 20 inches x 20 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 gauge\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: 21r82020\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51383209689394,"sku":"21R82020","price":30.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312674527.webp?v=1782589758","url":"https:\/\/voomisupply.com\/products\/southwark-metal-21r82020-duct-end-cap-r8-20x20","provider":"Voomi Supply","version":"1.0","type":"link"}