{"product_id":"broan-4-in-duct-collar-with-backdraft-damper-for-models-636-636al","title":"Broan 4 in. Duct Collar with Backdraft Damper for Models 636\/636AL","description":"\u003ch1\u003eBroan 4 in. Duct Collar with Backdraft Damper for Models 636\/636AL\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eThis Broan 4 in. duct collar with backdraft damper is a replacement part for Broan models 636 and 636AL residential exhaust ventilation units. Sold as a single piece, it connects 4 in. ductwork to the fan while the built-in damper helps stop backdrafts when the fan is off.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackdraft damper:\u003c\/strong\u003e Built-in damper helps prevent outside air from flowing back through the duct when the fan is off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 in. duct size:\u003c\/strong\u003e Fits standard 4 in. duct connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel-specific fit:\u003c\/strong\u003e Designed for Broan models 636 and 636AL.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine replacement:\u003c\/strong\u003e Broan-NuTone residential exhaust ventilation and air quality part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy swap:\u003c\/strong\u003e Direct replacement collar for service and repair work.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch2\u003eSpecifications Table:\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBroan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSell unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuct Collar Backdraft Damper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible models\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBroan 636 \/ 636AL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuct collar with backdraft damper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eResidential exhaust ventilation duct connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack quantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eMade for Broan models 636 and 636AL exhaust ventilation units with 4 in. duct connections; not listed for other fan models.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is included?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One Broan 4 in. duct collar with backdraft damper.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Which fans does it fit?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is specified for Broan models 636 and 636AL.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What duct size does it accept?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is sized for 4 in. duct.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What does the damper do?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The backdraft damper helps keep outside air from entering through the duct when the fan is not running.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eWhen servicing a 636 or 636AL exhaust fan, replacing a worn or missing duct collar is a quick way to restore proper airflow control and stop backdrafts. Verify the 4 in. duct match before ordering, and make sure the damper swings freely after installation so it can seat closed. Keep the connection sealed where the collar meets the duct.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eDisconnect power to the ventilation unit before installing or servicing the duct collar.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eGet the Broan 4 in. duct collar with backdraft damper to restore your 636\/636AL ventilation unit.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Broan","offers":[{"title":"Default Title","offer_id":67804815556822,"sku":"BRO4DC","price":18.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0778\/5244\/2838\/files\/ProductImage_Broan_BRO4DC.jpg?v=1793125022","url":"https:\/\/buildsupplyus.myshopify.com\/products\/broan-4-in-duct-collar-with-backdraft-damper-for-models-636-636al","provider":"Buildsupply","version":"1.0","type":"link"}