{"product_id":"southwark-metal-mc-84l-d-4-duct-board-collar-with-damper-4-in","title":"Southwark Metal mc-84l-d-4 Duct Board Collar with Damper 4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOUTHWARK METAL mc-84l-d-4 is a long style duct board collar with an integrated damper, sized for 4-inch round duct connections. It is designed to terminate ductboard supply trunks and transition to flexible or rigid branch runs in low-pressure residential and light commercial HVAC distribution systems. The long-style barrel provides additional insertion depth into ductboard, improving retention and reducing air bypass at the collar joint. Licensed HVAC installers and sheet metal mechanics typically install this fitting during new construction or duct replacement work.\u003c\/p\u003e\n\u003cp\u003eThis collar is suited for use in residential forced-air heating and cooling systems where ductboard is the primary trunk or plenum material. The built-in damper allows airflow balancing at the branch takeoff point without requiring a separate inline balancing damper. Typical installations include supply plenum penetrations, ductboard trunk-to-branch transitions, and air handler discharge assemblies where branch outlets need field-adjustable volume control.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLong-style barrel design provides deeper ductboard engagement for a secure, low-leakage fit\u003c\/li\u003e\n  \u003cli\u003eIntegrated damper enables airflow balancing directly at the collar without additional fittings\u003c\/li\u003e\n  \u003cli\u003e4-inch round connection size suits common residential branch duct runs\u003c\/li\u003e\n  \u003cli\u003ePart of the 84STLWD series, a recognized ductboard fitting product line\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and new-construction fitting for residential and light commercial ductboard systems using 4-inch round branch connections.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified HVAC technician or licensed sheet metal mechanic. Shut down the air handling unit and confirm the system is de-energized before cutting ductboard or inserting the collar. Secure the collar with foil-backed tape and mastic sealant per SMACNA and local mechanical code requirements to minimize air leakage at the joint. Adjust the integral damper after system startup during the air balancing phase.\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\u003eStyle\u003c\/strong\u003e: Long Style\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Size\u003c\/strong\u003e: 4 inches\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-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWARK METAL","offers":[{"title":"Default Title","offer_id":51138402615602,"sku":"MC-84L-D-4","price":19.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305532251.jpg?v=1778255403","url":"https:\/\/voomisupply.com\/products\/southwark-metal-mc-84l-d-4-duct-board-collar-with-damper-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}