{"product_id":"superior-outside-air-kit-less-duct-combustion-air-kit-for-brt40st-gas-fireplace","title":"Superior 4\" Outside Air Kit for BRT40ST See-Through Gas Fireplace","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe Superior FOAK-4LD is listed in the manufacturer's price book as Material #81L88, described there as \"Outside Air Kit Less Duct (4\")\", and is grouped under the Outside Air Kits section of the catalog alongside the other parts sold for this line of fireplaces. Some fireplace and log set installations draw their combustion air from indoors rather than through a sealed direct-vent system, and an outside air kit is what lets that same appliance instead pull its combustion air from outdoors, through a dedicated duct run. That matters most in tightly sealed, well-insulated homes, where an appliance drawing combustion air from the room can compete with other exhaust appliances - range hoods, clothes dryers, bathroom fans - for the same limited supply of indoor air.\u003c\/p\u003e\n\u003cp\u003eThe FOAK-4LD is priced as a standalone factory part, separate from any fireplace it is ordered with, and it is listed as fitting BRT40ST Gas Fireplace. An outside air kit installs at the collar built into the back or side of the appliance, with the flexible duct run to the exterior sized and routed according to the installation manual for that specific fireplace. Local code in many jurisdictions requires an outside air supply on solid-fuel and some gas appliances installed in tightly sealed new construction, so it is worth checking local requirements before deciding whether this kit is optional or required. Because the kit is sized to a specific appliance's air intake collar, confirm the exact model number of the fireplace or stove it will be installed on before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOne Superior FOAK-4LD - Outside Air Kit Less Duct (4\")\u003c\/li\u003e\n\u003cli\u003eMaterial #81L88, supplied in the manufacturer's packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Superior air kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding-right: 16px;\"\u003eModel #\u003c\/th\u003e\n\u003ctd\u003eFOAK-4LD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding-right: 16px;\"\u003eMaterial #\u003c\/th\u003e\n\u003ctd\u003e81L88\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding-right: 16px;\"\u003eDescription\u003c\/th\u003e\n\u003ctd\u003eOutside Air Kit Less Duct (4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding-right: 16px;\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCombustion Air Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding-right: 16px;\"\u003ePrice Book Section\u003c\/th\u003e\n\u003ctd\u003eOutside Air Kits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding-right: 16px;\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSuperior\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Superior","offers":[{"title":"Default Title","offer_id":48312886165662,"sku":"FOAK-4LD","price":68.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/9542\/9022\/files\/FOAK-4.webp?v=1791177570","url":"https:\/\/usfireplaceshop.com\/products\/superior-outside-air-kit-less-duct-combustion-air-kit-for-brt40st-gas-fireplace","provider":"US Fireplace Shop","version":"1.0","type":"link"}