{"product_id":"southwark-metal-55nc_18in-duct-end-cap-18-inch-round","title":"Southwark Metal 55NC_18IN Duct End Cap 18 Inch Round","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SOUTHWARK METAL 55NC_18IN is an 18-inch round sheet metal duct end cap designed to seal the open terminus of round duct runs in forced-air HVAC systems. Fabricated from hot-dipped galvanized steel, it provides corrosion resistance suited for both supply and return air applications. The plain, non-crimped design allows it to slip over or cap off duct sections cleanly without requiring a pre-formed crimp for fitment. HVAC sheet metal mechanics and duct installers typically specify this cap during new construction, renovation, or system modification work where a duct run must be capped, blanked, or temporarily sealed.\u003c\/p\u003e\u003cp\u003eThis end cap is used in residential and light commercial forced-air HVAC duct systems. It is well suited for capping unused branch takeoffs, sealing duct ends during construction phases, or terminating runs that are no longer in service. The round profile and 18-inch diameter make it appropriate for main trunk caps or larger branch duct terminations. It meets ACCA and SMACNA fabrication and installation standards, which are the governing specifications for sheet metal duct construction across most jurisdictions.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e18-inch diameter round profile for use on standard round duct\u003c\/li\u003e\n\u003cli\u003eHot-dipped galvanized steel construction for corrosion resistance\u003c\/li\u003e\n\u003cli\u003ePlain end design without crimp for straightforward fitment\u003c\/li\u003e\n\u003cli\u003eMeets ACCA and SMACNA applicable standards\u003c\/li\u003e\n\u003cli\u003eSuitable for sealing, capping, or blanking round duct terminations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style sheet metal fitting for use with 18-inch round galvanized duct systems installed and fabricated to ACCA and SMACNA standards.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by licensed HVAC mechanics or sheet metal workers. Before capping any duct section, confirm the system is powered down and airflow to the affected branch is isolated. Secure the end cap with sheet metal screws and seal all joints with UL 181-rated duct sealant or foil tape per SMACNA guidelines to maintain system pressure integrity. Do not leave unsealed gaps that could allow conditioned air loss or contaminant ingress.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize\u003c\/strong\u003e: 18 inches diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape\u003c\/strong\u003e: Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Hot-Dipped Galvanized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Plain (no crimp)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplicable Standards\u003c\/strong\u003e: ACCA, SMACNA\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: 55NC_18IN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51284131283250,"sku":"55NC_18IN","price":47.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309277504.jpg?v=1781069363","url":"https:\/\/voomisupply.com\/products\/southwark-metal-55nc_18in-duct-end-cap-18-inch-round","provider":"Voomi Supply","version":"1.0","type":"link"}