{"title":"Firestops","description":"","products":[{"product_id":"4mfs-firestop-4-inch","title":"4MFS - Firestop - 4 Inch","description":"\u003cp\u003e\u003cstrong\u003eMetal-Fab 4MFS - Type B Gas Vent Firestop - 4\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMetal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe outer wall is constructed of galvanized steel, .018\" thick G-90 for sizes 3\" to 14\" diameter, and .024\" thick G-90 for sizes 16\" to 30\" diameter. The inner wall is constructed of aluminum alloy, .012\" thick for sizes 3\" to 8\" diameter and .018\" thick for sizes 10\" to 30\" diameter. The vent includes an integral, annular insulating air space, ¼\" thick for sizes3\" to 6\" diameter and 1\/2\" thick for sizes 7\" to 30\" diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType B Gas Vent\u003c\/li\u003e\n\u003cli\u003eFor use with approved gas furnaces, heaters, fireplaces and boilers\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds all recognizes gas venting codes\u003c\/li\u003e\n\u003cli\u003eUL listed to adapt to identified competing B-Vent brands.\u003c\/li\u003e\n\u003cli\u003e1\" Minimum clearance to combustibles for 3\" through 24\" diameters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSurelock B-Vent Locking System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe design of the SureLock B-Vent Locking System is unique. The male end of the pipe features a square dimple, positioned in the exact location to match the tab that is located on the female end of the pipe. When the pipe is joined and twisted until it stops, the SureLock tab can be pushed into the square dimple, therefore creating a positive twist lock that cannot be twisted apart.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: right;\"\u003e\u003cspan style=\"color: #999999;\"\u003eHSS1810247\u003c\/span\u003e\u003c\/p\u003e","brand":"Metal-Fab","offers":[{"title":"Default Title","offer_id":43580125151477,"sku":"4MFS","price":13.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/6150\/2518\/files\/metalfab_type-b_mfs-firestop.jpg?v=1755627667"},{"product_id":"metal-fab-3mfs-type-b-gas-vent-firestop-3-inch","title":"3MFS - Type B Gas Vent Firestop - 3\"","description":"\u003cp\u003e\u003cstrong\u003eMetal-Fab 3MFS - Type B Gas Vent Firestop - 3\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMetal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe outer wall is constructed of galvanized steel, .018\" thick G-90 for sizes 3\" to 14\" diameter, and .024\" thick G-90 for sizes 16\" to 30\" diameter. The inner wall is constructed of aluminum alloy, .012\" thick for sizes 3\" to 8\" diameter and .018\" thick for sizes 10\" to 30\" diameter. The vent includes an integral, annular insulating air space, ¼\" thick for sizes3\" to 6\" diameter and 1\/2\" thick for sizes 7\" to 30\" diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType B Gas Vent\u003c\/li\u003e\n\u003cli\u003eFor use with approved gas furnaces, heaters, fireplaces and boilers\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds all recognizes gas venting codes\u003c\/li\u003e\n\u003cli\u003eUL listed to adapt to identified competing B-Vent brands.\u003c\/li\u003e\n\u003cli\u003e1\" Minimum clearance to combustibles for 3\" through 24\" diameters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSurelock B-Vent Locking System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe design of the SureLock B-Vent Locking System is unique. The male end of the pipe features a square dimple, positioned in the exact location to match the tab that is located on the female end of the pipe. When the pipe is joined and twisted until it stops, the SureLock tab can be pushed into the square dimple, therefore creating a positive twist lock that cannot be twisted apart.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: right;\"\u003e\u003cspan style=\"color: #999999;\"\u003eHSS1810122\u003c\/span\u003e\u003c\/p\u003e","brand":"Metal-Fab","offers":[{"title":"Default Title","offer_id":44178840060149,"sku":"3MFS","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/6150\/2518\/files\/metalfab_type-b_mfs-firestop_4e6902a3-6c4f-4046-86cc-6c3986f52829.jpg?v=1755627102"},{"product_id":"metal-fab-5mfs-type-b-gas-vent-firestop-5-inch","title":"5MFS - Type B Gas Vent Firestop - 5\"","description":"\u003cp\u003e\u003cstrong\u003eMetal-Fab 5MFS - Type B Gas Vent Firestop - 5\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMetal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection?\u003c\/p\u003e\n\u003cp\u003eThe Metal-Fab 5MFS Firestop is designed for use with 5\" Type B gas vent systems, maintaining the required clearance to combustibles when the vent passes through a floor or ceiling. It provides a secure, code-compliant installation point while supporting proper vent alignment and thermal separation. Built from durable galvanized steel, this firestop ensures long-lasting safety and performance for residential and light commercial gas appliance venting systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eManufacturer: Metal-Fab\u003c\/li\u003e\n\u003cli\u003ePart Number: 5MFS\u003c\/li\u003e\n\u003cli\u003eType: Type B Gas Vent Firestop\u003c\/li\u003e\n\u003cli\u003eApplication: Maintains 1\" clearance to combustibles where vent passes through a floor or ceiling\u003c\/li\u003e\n\u003cli\u003eSize: 5\" nominal diameter\u003c\/li\u003e\n\u003cli\u003eMaterial: Galvanized steel outer wall with aluminum inner wall\u003c\/li\u003e\n\u003cli\u003eDesign: Flat plate with centered spacer ring for clearance and support\u003c\/li\u003e\n\u003cli\u003eConnection Type: Compatible with Metal-Fab Type B gas vent systems\u003c\/li\u003e\n\u003cli\u003eCertification: UL 441 listed for Type B gas vent installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: right;\"\u003e\u003csup\u003e\u003cspan style=\"color: #999999;\"\u003eHSS1810393\u003c\/span\u003e\u003c\/sup\u003e\u003c\/p\u003e","brand":"Metal-Fab","offers":[{"title":"Default Title","offer_id":44192648298741,"sku":"5MFS","price":25.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/6150\/2518\/files\/metalfab_5MFS_2_wm.jpg?v=1760676015"},{"product_id":"metal-fab-6mfs-type-b-gas-vent-firestop-6-inch","title":"6MFS - Type B Gas Vent Firestop - 6\"","description":"\u003cp\u003e\u003cstrong\u003eMetal-Fab 6MFS - Type B Gas Vent Firestop - 6\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMetal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection?\u003c\/p\u003e\n\u003cp\u003eThe Metal-Fab 6MFS Firestop is designed for use with 6\" Type B gas vent systems, maintaining the required clearance to combustibles when the vent passes through a floor or ceiling. It provides a secure, code-compliant installation point while supporting proper vent alignment and thermal separation. Built from durable galvanized steel, this firestop ensures long-lasting safety and performance for residential and light commercial gas appliance venting systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eManufacturer: Metal-Fab\u003c\/li\u003e\n\u003cli\u003ePart Number: 6MFS\u003c\/li\u003e\n\u003cli\u003eType: Type B Gas Vent Firestop\u003c\/li\u003e\n\u003cli\u003eApplication: Maintains 1\" clearance to combustibles where vent passes through a floor or ceiling\u003c\/li\u003e\n\u003cli\u003eSize: 6\" nominal diameter\u003c\/li\u003e\n\u003cli\u003eMaterial: Galvanized steel outer wall with aluminum inner wall\u003c\/li\u003e\n\u003cli\u003eDesign: Flat plate with centered spacer ring for clearance and support\u003c\/li\u003e\n\u003cli\u003eConnection Type: Compatible with Metal-Fab Type B gas vent systems\u003c\/li\u003e\n\u003cli\u003eCertification: UL 441 listed for Type B gas vent installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: right;\"\u003e\u003csup\u003e\u003cspan style=\"color: #999999;\"\u003eHSS1810537\u003c\/span\u003e\u003c\/sup\u003e\u003c\/p\u003e","brand":"Metal-Fab","offers":[{"title":"Default Title","offer_id":44192890650869,"sku":"6MFS","price":26.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/6150\/2518\/files\/metalfab_5MFS_2_wm_677f9a7f-113d-49cf-89b1-d03621bdd034.jpg?v=1760676473"},{"product_id":"metal-fab-4mofs-type-b-gas-vent-oval-firestop-spacer-4-inch","title":"4MOFS - Type-B Gas Vent Oval Firestop Spacer - 4\"","description":"\u003cp\u003e\u003cstrong\u003eMetal-Fab 4MOFS - Type-B Gas Vent Oval Firestop Spacer - 4\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMetal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection?\u003c\/p\u003e\n\u003cp\u003eMetal-Fab 4MOFS - Type B Gas Vent Oval Firestop Spacer - 4\"\u003c\/p\u003e\n\u003cp\u003eThe Metal-Fab 4MOFS is a 4-inch oval firestop spacer designed for use with Type B gas vent systems. It provides the required firestop and clearance to combustibles when the vent passes through a wall, floor, or ceiling. Built to fit standard 2x4 stud walls, this spacer centers and secures the oval vent pipe while maintaining proper clearances. It’s constructed from durable galvanized steel and aluminum materials, ensuring long-lasting performance and compliance with UL 441 standards for gas venting systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eManufacturer: Metal-Fab\u003c\/li\u003e\n\u003cli\u003ePart Number: 4MOFS\u003c\/li\u003e\n\u003cli\u003eType: Type B Gas Vent Oval Firestop Spacer\u003c\/li\u003e\n\u003cli\u003eMaterial: Galvanized steel outer wall, aluminum inner wall\u003c\/li\u003e\n\u003cli\u003eVent Size: 4 inch (oval)\u003c\/li\u003e\n\u003cli\u003eApplication: Provides firestop and clearance through walls, floors, or ceilings\u003c\/li\u003e\n\u003cli\u003eDesign: Fits standard 2x4 stud wall framing (16\" on center)\u003c\/li\u003e\n\u003cli\u003eClearance to Combustibles: 1 inch minimum\u003c\/li\u003e\n\u003cli\u003eListing: UL 441 certified for Type B gas vent systems\u003c\/li\u003e\n\u003cli\u003eAdditional Features: Centers oval vent and maintains system integrity for safe venting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: right;\"\u003e\u003csup\u003e\u003cspan style=\"color: #999999;\"\u003eHSS1811195\u003c\/span\u003e\u003c\/sup\u003e\u003c\/p\u003e","brand":"Metal-Fab","offers":[{"title":"Default Title","offer_id":44193926971637,"sku":"4MOFS","price":18.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/6150\/2518\/files\/metalfab_4MOFS_1_wm.jpg?v=1761069448"}],"url":"https:\/\/www.supplystop.com\/collections\/firestops\/metal-fab.oembed","provider":"SupplyStop.com","version":"1.0","type":"link"}