{"product_id":"southwark-metal-att_18in-duct-takeoff-18-inch-air-tite","title":"Southwark Metal ATT_18IN Duct Takeoff 18 Inch Air-tite","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SOUTHWARK METAL ATT_18IN is an 18-inch diameter Air-Tite sheet metal duct takeoff fabricated from hot dip galvanized steel. Duct takeoffs connect branch ducts to a main trunk line, directing conditioned air through the distribution system. This fitting meets ACCA and SMACNA standards, confirming dimensional accuracy and construction quality appropriate for engineered duct systems. The galvanized steel construction resists corrosion in both supply and return applications. HVAC installers and sheet metal contractors use this fitting in new construction and retrofit projects where a reliable, airtight branch connection is required at the trunk.\u003c\/p\u003e\u003cp\u003eThis takeoff is suited for residential and light commercial forced-air systems where an 18-inch diameter branch tap is specified. It is used in low-pressure supply air distribution systems and is appropriate for applications where duct leakage control is a design priority. The Air-Tite designation indicates the fitting is designed to minimize air leakage at the connection point, supporting system efficiency and Manual D compliance in ducted HVAC installations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e18-inch diameter opening for large-volume branch duct connections\u003c\/li\u003e\n\u003cli\u003eHot dip galvanized steel construction for corrosion resistance in HVAC environments\u003c\/li\u003e\n\u003cli\u003eAir-Tite design reduces duct leakage at the takeoff connection\u003c\/li\u003e\n\u003cli\u003eMeets ACCA and SMACNA applicable standards for duct fittings\u003c\/li\u003e\n\u003cli\u003eSuitable for low-pressure forced-air supply distribution systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation fitting for 18-inch diameter branch connections in residential and light commercial sheet metal duct systems built to SMACNA and ACCA specifications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handler and close the system before cutting into the main trunk. Secure the takeoff with sheet metal screws and seal all joints with UL 181-listed mastic or foil tape to maintain system airtightness. Do not exceed the pressure class rating of the surrounding duct system.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Hot Dip Galvanized Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Air-Tite\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: ATT_18IN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51284079018290,"sku":"ATT_18IN","price":37.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309278223.jpg?v=1781067978","url":"https:\/\/voomisupply.com\/products\/southwark-metal-att_18in-duct-takeoff-18-inch-air-tite","provider":"Voomi Supply","version":"1.0","type":"link"}