{"product_id":"southwark-metal-mc-84l-d-8-duct-board-collar-damper-8-in","title":"Southwark Metal mc-84l-d-8 Duct Board Collar Damper 8 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOUTHWARK METAL mc-84l-d-8 is an 8-inch long-style duct board collar with an integrated damper, designed for use in forced-air distribution systems. This collar provides a transition point between the duct board and branch takeoffs or register boots, with the built-in damper allowing airflow to be adjusted or shut off at the zone level. It carries a dark bronze baked enamel finish that resists corrosion and blends with standard duct system aesthetics. HVAC installers and sheet metal contractors are the primary trades who work with this component during new construction or renovation duct system builds.\u003c\/p\u003e\n\u003cp\u003eThis collar is used in residential and light commercial forced-air HVAC applications where duct board is the primary trunk or branch material. The long-style design provides additional insertion depth into the duct board, improving the seal and structural connection at the penetration point. It is a common component in supply-side duct systems where zone damping at the collar level is preferred over downstream balancing dampers.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eIntegrated damper allows airflow adjustment directly at the collar without a separate balancing component\u003c\/li\u003e\n  \u003cli\u003eLong-style design provides deeper insertion into duct board for a more secure and airtight fit\u003c\/li\u003e\n  \u003cli\u003eDark bronze baked enamel finish for corrosion resistance and a clean appearance\u003c\/li\u003e\n  \u003cli\u003e8-inch nominal size fits standard 8-inch round duct board openings\u003c\/li\u003e\n  \u003cli\u003ePart of the 84STLWD series, consistent with Southwark Metal duct board accessory product line\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting for duct board systems requiring an 8-inch collar with integral damper in long-style configuration.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by licensed HVAC technicians or qualified sheet metal contractors. The forced-air system should be fully powered down and the air handler or furnace shut off before cutting into or modifying the duct board. Proper duct board knife technique and foil tape or mastic sealant should be used at the collar perimeter to maintain system airtightness per applicable mechanical codes. Do not overtighten or force the collar into undersized openings, as this can compromise the duct board face and reduce seal integrity.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 84STLWD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize\u003c\/strong\u003e: 8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: Long\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Dark Bronze Baked Enamel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDamper\u003c\/strong\u003e: Integrated\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: mc-84l-d-8\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51138598535474,"sku":"MC-84L-D-8","price":22.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305532683.jpg?v=1778259806","url":"https:\/\/voomisupply.com\/products\/southwark-metal-mc-84l-d-8-duct-board-collar-damper-8-in","provider":"Voomi Supply","version":"1.0","type":"link"}