{"product_id":"superior-vrt3136-36-vent-free-firebox","title":"Superior VRT3100 36\" Vent-Free Firebox (VRT3136)","description":"\u003cp\u003eThe Superior VRT3136 is a 36\" vent-free gas firebox (Innovative Hearth Products). It offers a 36\" × 24\" opening, with a 20\" installed depth.\u003c\/p\u003e\u003cp\u003eThis listing covers 2 variants — Interior liner. Use the selectors above to configure your unit.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eNeed a different size? This series is also available in 42\" and 32\" — use the size selector above to compare all sizes.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired to complete:\u003c\/strong\u003e vent-free gas log set \/ burner (sold separately, choose from the options on this page) — see Installation \u0026amp; Planning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e 20\" depth, hearth extension not required; optional (appearance only).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety listed:\u003c\/strong\u003e Listed by PFS Corporation to ANSI Z21.91 (Ventless Firebox Enclosures for Gas-Fired Unvented Decorative Room Heaters); approved for use with appliances listed to ANSI Z21.11.2 (report F14-168).\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eVRT3136WS, VRT3136F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCatalog Numbers\u003c\/td\u003e\n\u003ctd\u003eF3306 \/ F3309\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign Style\u003c\/td\u003e\n\u003ctd\u003eTraditional clean-face, heat-circulating universal firebox; WS models with refractory liner and floor, F models with ceramic fiber liner and black metal floor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eUniversal vent-free firebox (built-in enclosure for a listed vent-free gas log room heater)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size\u003c\/td\u003e\n\u003ctd\u003e36\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel Type\u003c\/td\u003e\n\u003ctd\u003eNatural Gas or Propane — determined by the vent-free gas log set installed (the firebox has no burner of its own)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation Type\u003c\/td\u003e\n\u003ctd\u003eIndoor built-in (zero-clearance framing with factory top stand-off spacers); may be set directly on a combustible floor or on a raised platform; not for recreational vehicles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoom Use Restrictions\u003c\/td\u003e\n\u003ctd\u003eMay be installed in a bedroom only when equipped with a listed vent-free log set of 10,000 BTU input or less; do not install in a bathroom or in recreational vehicles; Massachusetts: not in bedrooms or bathrooms, 527 CMR 30 applies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Log Set Input\u003c\/td\u003e\n\u003ctd\u003e40,000 BTU\/hr maximum — for use only with a listed gas-fired unvented decorative room heater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApproved Log Sets \/ Burners\u003c\/td\u003e\n\u003ctd\u003eVent-free gas log room heaters listed to ANSI Z21.11.2 only (input not to exceed 40,000 BTU\/hr); log set sold separately — required to complete\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical\u003c\/td\u003e\n\u003ctd\u003eNo electrical connection required for the firebox itself; optional FBK-100 \/ FBK-200 blower kits require a 3-wire 120 VAC, 60 Hz, 1 ph supply roughed in before framing plus the separately sold Junction Box \/ Electrical Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFireplace Opening (W × H)\u003c\/td\u003e\n\u003ctd\u003e36\" × 24\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterior Firebox Dimensions\u003c\/td\u003e\n\u003ctd\u003eFront width 35\", rear width 23-1\/4\", depth 17-3\/8\", height 24\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Width\u003c\/td\u003e\n\u003ctd\u003e41-3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Height\u003c\/td\u003e\n\u003ctd\u003e37-1\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Depth\u003c\/td\u003e\n\u003ctd\u003e20\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHood\u003c\/td\u003e\n\u003ctd\u003eHeat-deflection hood included and required on all VRT3100 models in all installations; use only the factory hood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScreens\u003c\/td\u003e\n\u003ctd\u003eMesh fire screens (2) with rods, factory-fitted; screens must be closed before operating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eDurable textured black powder-coat face and hood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eListed by PFS Corporation to ANSI Z21.91 (Ventless Firebox Enclosures for Gas-Fired Unvented Decorative Room Heaters); approved for use with appliances listed to ANSI Z21.11.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eListing Report No.\u003c\/td\u003e\n\u003ctd\u003eF14-168\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eShipping Information\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e188 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions (L × W × H)\u003c\/td\u003e\n\u003ctd\u003e44.5\" × 22.5\" × 41.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Volume\u003c\/td\u003e\n\u003ctd\u003e24.046 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cem\u003eShipping figures describe the packed carton, not the installed fireplace.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eWhat's Included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVent-free gas firebox with factory-fitted liner (refractory panels on WS models, ceramic fiber panels on F models) and mesh fire screens\u003c\/li\u003e\n\u003cli\u003eHeat-deflection hood (required on all installations)\u003c\/li\u003e\n\u003cli\u003eInstallation and operation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation \u0026amp; Planning\u003c\/h2\u003e\u003ch3\u003eFraming \u0026amp; Installation Dimensions\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming Width (minimum opening)\u003c\/td\u003e\n\u003ctd\u003e42-1\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming Height\u003c\/td\u003e\n\u003ctd\u003e40-1\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming Depth\u003c\/td\u003e\n\u003ctd\u003e20-1\/2\" to back wall of chase\/enclosure including finishing materials\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming Rear Width\u003c\/td\u003e\n\u003ctd\u003e23-5\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas Line Access\u003c\/td\u003e\n\u003ctd\u003e1\/2\" min. to 1-1\/2\" max. inside-diameter approved gas line; gas line access both sides; junction-box knock-out right side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlatform \/ Hearth Requirements\u003c\/td\u003e\n\u003ctd\u003eMay be installed directly on a combustible floor or raised on a platform; on carpet, vinyl tile (other than ceramic) or other combustible flooring a metal or wood panel covering the full width and depth is required; hearth extension not required (optional raised hearth extension: combustibles allowed, no carpet or vinyl; firebox floor max 5-3\/4\" above base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHearth Extension\u003c\/td\u003e\n\u003ctd\u003eNot required; optional (appearance only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorner Installation\u003c\/td\u003e\n\u003ctd\u003eSupported — see the installation manual corner-framing table\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFraming Note\u003c\/td\u003e\n\u003ctd\u003eDo not fill spaces around the firebox with insulation or other materials; do not notch framing or alter the top spacers; headers may contact the top spacers but must not be supported by them; framed depth is measured from the finished rear-wall surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eClearances to Combustibles\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTop Standoffs\u003c\/td\u003e\n\u003ctd\u003e0\" — headers may be in direct contact with the factory top stand-off spacers (4 places)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFloor\u003c\/td\u003e\n\u003ctd\u003e0\" — may sit directly on a combustible surface on a fully supported base the full width and depth of the unit (panel required on carpet\/vinyl)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCeiling Clearance\u003c\/td\u003e\n\u003ctd\u003e40\" minimum from the top of the firebox opening to the ceiling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible Side Wall\u003c\/td\u003e\n\u003ctd\u003e16\" minimum from the side of the firebox opening to a combustible side wall; combustible material protruding from the wall plane (mantel legs, bookshelves) must be kept outside the 45° safe zone (e.g. a 5\" projection needs 6\" clearance); no combustible material closer than 3\" to the firebox opening\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible Mantel\u003c\/td\u003e\n\u003ctd\u003eMinimum height above the firebox opening increases with mantel projection per the manufacturer chart (with hood installed: e.g. a 5\" projection must be ≈13\" or more above the opening); non-combustible material (≥1\/2\" thick) required in the 3\" zone directly above the opening\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustible Material Restrictions\u003c\/td\u003e\n\u003ctd\u003eOnly non-combustible materials (marble, stone, tile, brick, etc.) may overlap the black front face; no combustible material may overlap or contact the front painted face; seal facing-to-surround joints with non-combustible caulk; keep curtains, furniture and other flammables at least 42\" from the front of the installed heater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eRequired Components \u0026amp; Compatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVent-free gas log set \/ burner (required to complete, sold separately):\u003c\/strong\u003e any ANSI Z21.11.2-listed vent-free gas log room heater with an input not exceeding 40,000 BTU\/hr (10,000 BTU\/hr or less for bedroom installations); check the log set's minimum firebox size against the interior dimensions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas supply:\u003c\/strong\u003e 1\/2\" to 1-1\/2\" ID approved gas line with sediment trap; external regulator on propane systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional:\u003c\/strong\u003e FBK-100 single-speed or FBK-200 variable-speed blower kit (each needs a Junction Box \/ Receptacle Kit and 120 VAC roughed in before framing); FWSK on\/off wall switch; OAK-UVFRC outside air gate \u0026amp; duct kit; ASD3224-TI \/ ASD3624-TI \/ ASD4224-TI decorative arch screen door panel kits; SCTPSAB touch-up paint\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Superior Fireplaces","offers":[{"title":"Stacked Refractory","offer_id":50497405354223,"sku":"VRT3136WS","price":949.0,"currency_code":"USD","in_stock":true},{"title":"Back Bay Brown Fiber Liner","offer_id":50497405386991,"sku":"VRT3136F","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/5633\/8415\/files\/VRT3100-1_9da0b9c0-7f70-4405-ad14-dfaf637638f1.jpg?v=1786631421","url":"https:\/\/hearthdepot.com\/products\/superior-vrt3136-36-vent-free-firebox","provider":"Hearth Depot","version":"1.0","type":"link"}