{"title":"B-Vent Gas Fireplaces","description":"\u003cp\u003eB-vent gas fireplaces use a vertical chimney or flue to vent exhaust outside while pulling air from inside your home for combustion. They provide realistic flames and a cozy ambiance with a traditional style.\u003c\/p\u003e","products":[{"product_id":"empire-keystone-37-deluxe-b-vent-fireplace-natural-gas","title":"Empire Keystone 37\" Deluxe B-Vent Fireplace (Natural Gas)","description":"\u003cp\u003eThe Keystone 37 is the honest classic of the vented budget tier: a B-vent gas fireplace that uses simple 4-inch vertical venting - the same pipe logic as a water heater - instead of expensive coaxial systems, and prices accordingly. Empire rates it plainly as supplemental room heat and ambience, 21,000 BTU of it, with your choice of millivolt or intermittent-pilot ignition and a louvered or flush face, all under this listing.\u003c\/p\u003e\u003cp\u003eThe shallow 14-7\/8-inch chassis is the practical star: it frames into walls too thin for most direct-vent boxes, with zero clearance to combustibles on every casing surface.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eThis product is part of the Keystone Deluxe B-Vent family - use the selector above to compare sizes and control options.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple 4\" B-vent:\u003c\/strong\u003e vertical venting without coaxial pipe - the budget-honest route to a real vented flame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e21,000 BTU supplemental heat:\u003c\/strong\u003e rated as room heat and ambience, never as a furnace substitute.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour variants:\u003c\/strong\u003e millivolt or IP ignition, louvered or flush face - the flush version tiles in like masonry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShallowest vented Empire fireplace:\u003c\/strong\u003e 14-7\/8\" deep; frames at just 14-3\/8\" of cavity depth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePropane path:\u003c\/strong\u003e the \u003ca href=\"\/products\/empire-natural-gas-to-propane-conversion-kit-for-keystone-b-vent-fireplaces\"\u003ecertified BVCK conversion kit\u003c\/a\u003e converts the millivolt valve; IP valves use factory kits.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e37\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput (Natural Gas)\u003c\/td\u003e\n\u003ctd\u003e21,000 BTU max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel\u003c\/td\u003e\n\u003ctd\u003eNatural Gas (certified propane conversion kit available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVenting\u003c\/td\u003e\n\u003ctd\u003eB-Vent, 4\" diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Class\u003c\/td\u003e\n\u003ctd\u003eSupplemental room heat \/ decorative appliance (not a primary heat source)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl\u003c\/td\u003e\n\u003ctd\u003eMillivolt or Intermittent Pilot; louvered or flush face (by variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit (measured)\u003c\/td\u003e\n\u003ctd\u003e32-3\/4\" H x 37\" W x 14-7\/8\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming (measured)\u003c\/td\u003e\n\u003ctd\u003e35-3\/4\" H x 37-3\/8\" W x 14-3\/8\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance to Combustibles\u003c\/td\u003e\n\u003ctd\u003e0\" back, sides, floor, top stand-off; 1\" top framing edge; 36\" to ceiling; 6\" sidewall\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas Connection\u003c\/td\u003e\n\u003ctd\u003e1\/2\" NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime (glass, combustion chamber, heat exchanger); 3-yr parts; 1-yr accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eInstallation \u0026amp; Planning\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraming:\u003c\/strong\u003e 35-3\/4\" H x 37-3\/8\" W x 14-3\/8\" D in ordinary 2x4 lumber, with the face extending 1\/2\" proud for finishing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearances:\u003c\/strong\u003e 0\" at back, sides, floor and top stand-off; 1\" at the top framing edge; 6\" to a sidewall; 36\" to the ceiling; only non-combustible material over the black front\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFacing:\u003c\/strong\u003e the mantel chart starts combustible trim 1\/4\" above the top edge at 3\/4\" projection; a flush mantel base adds 3-3\/4\" to framed height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVenting:\u003c\/strong\u003e 4\"-diameter B-vent run vertically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas:\u003c\/strong\u003e 1\/2\" NPT connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl:\u003c\/strong\u003e millivolt or intermittent-pilot valve; the \u003ca href=\"\/products\/empire-remote-control-accessory\"\u003eFRBC battery remote\u003c\/a\u003e and \u003ca href=\"\/products\/empire-on-off-wall-switch-accessory\"\u003eFWS-1 wall switch\u003c\/a\u003e are the two factory-listed options\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCold-climate installs against exterior walls should be insulated to code.\u003c\/p\u003e","brand":"Empire Comfort Systems","offers":[{"title":"Millivolt \/ Louver","offer_id":50213172773103,"sku":"BVD34FP30LN","price":1589.0,"currency_code":"USD","in_stock":true},{"title":"Millivolt \/ Flush Face","offer_id":50213172805871,"sku":"BVD34FP30FN","price":1589.0,"currency_code":"USD","in_stock":true},{"title":"Intermittent Pilot \/ Louver","offer_id":50213172838639,"sku":"BVD34FP70LN","price":1829.0,"currency_code":"USD","in_stock":true},{"title":"Intermittent Pilot \/ Flush Face","offer_id":50213172871407,"sku":"BVD34FP70FN","price":1829.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/5633\/8415\/files\/BVD-1_33056aad-470e-43c5-b8a5-a6393e3f5e6c.jpg?v=1784549984"},{"product_id":"empire-keystone-39-deluxe-b-vent-fireplace-natural-gas","title":"Empire Keystone 39\" Deluxe B-Vent Fireplace (Natural Gas)","description":"\u003cp\u003eThe 39 steps the Keystone formula up a size: 25,000 BTU through a 36-inch-wide firebox, venting through 6-inch B-vent pipe, still priced and engineered as the sensible vented fireplace. Millivolt and intermittent-pilot valves, louvered and flush faces - four SKUs, one listing, all natural-gas standard with a certified propane conversion path.\u003c\/p\u003e\u003cp\u003eEmpire's candor is part of the appeal here: it is classified as supplemental room heat or a decorative appliance, not primary heating. Buy it for the nightly fire and the honest math.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eThis product is part of the Keystone Deluxe B-Vent family - use the selector above to compare sizes and control options.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25,000 BTU, 6\" B-vent:\u003c\/strong\u003e the larger Keystone burner breathing through conventional vertical pipe.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36\"-wide firebox:\u003c\/strong\u003e unit measures 34-3\/4\" H x 39\" W - mantel-classic proportions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLouvered or flush + MV or IP:\u003c\/strong\u003e all four factory variants selectable above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-clearance framing:\u003c\/strong\u003e 37-3\/4\" x 39-3\/8\" x 17-7\/8\" cavity in ordinary lumber; 1\" top framing edge is the only gap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWireless control:\u003c\/strong\u003e \u003ca href=\"\/products\/empire-remote-control-accessory\"\u003eFRBC remote\u003c\/a\u003e and \u003ca href=\"\/products\/empire-on-off-wall-switch-accessory\"\u003eFWS-1 switch\u003c\/a\u003e; propane via the \u003ca href=\"\/products\/empire-natural-gas-to-propane-conversion-kit-for-keystone-b-vent-fireplaces\"\u003eBVCK kit program\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e39\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput (Natural Gas)\u003c\/td\u003e\n\u003ctd\u003e25,000 BTU max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel\u003c\/td\u003e\n\u003ctd\u003eNatural Gas (certified propane conversion kit available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVenting\u003c\/td\u003e\n\u003ctd\u003eB-Vent, 6\" diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Class\u003c\/td\u003e\n\u003ctd\u003eSupplemental room heat \/ decorative appliance (not a primary heat source)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl\u003c\/td\u003e\n\u003ctd\u003eMillivolt or Intermittent Pilot; louvered or flush face (by variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit (measured)\u003c\/td\u003e\n\u003ctd\u003e34-3\/4\" H x 39\" W x 18-3\/8\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming (measured)\u003c\/td\u003e\n\u003ctd\u003e37-3\/4\" H x 39-3\/8\" W x 17-7\/8\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance to Combustibles\u003c\/td\u003e\n\u003ctd\u003e0\" back, sides, floor, top stand-off; 1\" top framing edge; 36\" to ceiling; 6\" sidewall\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas Connection\u003c\/td\u003e\n\u003ctd\u003e1\/2\" NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime (glass, combustion chamber, heat exchanger); 3-yr parts; 1-yr accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eInstallation \u0026amp; Planning\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraming:\u003c\/strong\u003e 37-3\/4\" H x 39-3\/8\" W x 17-7\/8\" D with the face 1\/2\" proud; a flush mantel base adds 3-3\/4\" to framed height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor:\u003c\/strong\u003e set on a full-footprint panel over carpet or tile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearances:\u003c\/strong\u003e zero everywhere except the 1\" top framing edge, 6\" to a sidewall and 36\" to the ceiling; only non-combustible material over the black front, and never block the louvers with finishing material\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVenting:\u003c\/strong\u003e 6\" B-vent run vertically\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas:\u003c\/strong\u003e 1\/2\" NPT connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl:\u003c\/strong\u003e millivolt or intermittent-pilot valve (by variant)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eJoints seal with 300 F sealant if sealed at all.\u003c\/p\u003e","brand":"Empire Comfort Systems","offers":[{"title":"Millivolt \/ Louver","offer_id":50213173068015,"sku":"BVD36FP30LN","price":1969.0,"currency_code":"USD","in_stock":true},{"title":"Millivolt \/ Flush Face","offer_id":50213173100783,"sku":"BVD36FP30FN","price":1969.0,"currency_code":"USD","in_stock":true},{"title":"Intermittent Pilot \/ Louver","offer_id":50213173133551,"sku":"BVD36FP70LN","price":2199.0,"currency_code":"USD","in_stock":true},{"title":"Intermittent Pilot \/ Flush Face","offer_id":50213173166319,"sku":"BVD36FP70FN","price":2199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/5633\/8415\/files\/BVD-1_78689d9f-8002-4c50-8850-b2d9ab6bd734.jpg?v=1784549991"},{"product_id":"empire-keystone-43-premium-b-vent-fireplace-natural-gas","title":"Empire Keystone 43\" Premium B-Vent Fireplace (Natural Gas)","description":"\u003cp\u003eThe Keystone 43\" Premium is a natural-gas B-vent fireplace - a taller, more traditional firebox that vents vertically through a standard 6\" B-vent system rather than a sealed direct-vent pipe. B-vent draws room air for combustion and carries products of combustion up and out, giving a natural, atmospheric flame over its four-log set.\u003c\/p\u003e\u003cp\u003eIt is rated at 30,000 BTU\/hr on natural gas and is zero-clearance certified for close framing. Millivolt (standing-pilot) and Intermittent-Pilot control builds are offered. A propane conversion kit is available where a tank supply is used.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eThis is a distinctive multi-configuration model, sold as a single build - there is no size selector; confirm your rough opening against the framing data below before ordering.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e43\" B-vent firebox:\u003c\/strong\u003e Taller traditional proportions vented vertically through a 6\" B-vent system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30,000 BTU natural gas:\u003c\/strong\u003e Atmospheric B-vent flame over a four-log set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-clearance certified:\u003c\/strong\u003e Approved for close-framed enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl choice:\u003c\/strong\u003e Millivolt standing-pilot or Intermittent-Pilot builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePropane-convertible:\u003c\/strong\u003e A certified LP conversion kit is available for tank supply.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e43\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eB-Vent (atmospheric, vertical vent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput (Natural Gas)\u003c\/td\u003e\n\u003ctd\u003e30,000 BTU max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel\u003c\/td\u003e\n\u003ctd\u003eNatural Gas (certified LP conversion kit available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVenting\u003c\/td\u003e\n\u003ctd\u003e6\" diameter B-Vent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirebox (measured)\u003c\/td\u003e\n\u003ctd\u003eFace width 43\"; height 34-3\/4\" without standoff; depth 18-3\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLog Set\u003c\/td\u003e\n\u003ctd\u003eFour-log set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIgnition\u003c\/td\u003e\n\u003ctd\u003eMillivolt (standing pilot) or Intermittent Pilot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eZero-clearance \/ design-certified to the ANSI standard (UL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime (combustion chamber, heat exchanger, factory glass); 3-yr parts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Empire Comfort Systems","offers":[{"title":"Millivolt \/ Louver","offer_id":50213173231855,"sku":"BVP42FP30LN","price":2369.0,"currency_code":"USD","in_stock":true},{"title":"Millivolt \/ Flush Face","offer_id":50213173264623,"sku":"BVP42FP30FN","price":2369.0,"currency_code":"USD","in_stock":true},{"title":"Intermittent Pilot \/ Louver","offer_id":50213173297391,"sku":"BVP42FP70LN","price":2649.0,"currency_code":"USD","in_stock":true},{"title":"Intermittent Pilot \/ Flush Face","offer_id":50213173330159,"sku":"BVP42FP70FN","price":2649.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/5633\/8415\/files\/BVP42FP-1_5779422a-2769-41ce-a78a-77cde53f878a.jpg?v=1784549998"}],"url":"https:\/\/hearthdepot.com\/collections\/b-vent-gas-fireplaces.oembed","provider":"Hearth Depot","version":"1.0","type":"link"}