{"product_id":"osburn-3500-wood-insert","title":"Osburn 3500 Wood Insert","description":"\u003cp\u003e\u003cb\u003eThe Osburn 3500 insert (OB03510) is a high-output non-catalytic wood insert for an existing masonry fireplace, rated for 1,000 to 2,700 sq ft with a maximum heat output of 110,000 BTU\/h.\u003c\/b\u003e Its 3.5 cu ft firebox takes logs up to 22\" long, loads across the width or the depth and burns up to 10 hours, behind a 19\" x 11 3\/4\" ceramic glass door. A 144 CFM blower is included.\u003c\/p\u003e\n\u003ch2\u003eAt a glance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e110,000 BTU\/h\u003c\/strong\u003e: Maximum heat output, dry cordwood\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1,000 to 2,700 sq ft\u003c\/strong\u003e: Recommended heating area\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEPA 2020 approved\u003c\/strong\u003e: 1.6 g\/h particulate emissions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e144 CFM blower\u003c\/strong\u003e: Included with the insert\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eOsburn 3500 wood insert, OB03510\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeat output\u003c\/th\u003e\n\u003ctd\u003e110,000 BTU\/h maximum (dry cordwood); overall 17,200 to 57,800 BTU\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeating area\u003c\/th\u003e\n\u003ctd\u003e1,000 to 2,700 sq ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEfficiency\u003c\/th\u003e\n\u003ctd\u003e71% average overall (HHV), 76% (LHV); 77% optimum overall\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEmissions\u003c\/th\u003e\n\u003ctd\u003e1.6 g\/h average particulate, non-catalytic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTest standard\u003c\/th\u003e\n\u003ctd\u003eEPA 2020 approved; tested to ASTM E3053-17 under 40 CFR Part 60, Subpart AAA; efficiency by the CSA B415.1-10 stack loss method\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFirebox\u003c\/th\u003e\n\u003ctd\u003e3.5 cu ft overall (2.88 cu ft EPA loading volume); 12 7\/8\" H x 22 7\/8\" W x 20 1\/8\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBurn time and logs\u003c\/th\u003e\n\u003ctd\u003eUp to 10 hours; logs up to 22\" long, loaded across the width or the depth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall size\u003c\/th\u003e\n\u003ctd\u003e24 7\/8\" H x 30 3\/8\" W x 29\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMinimum fireplace opening\u003c\/th\u003e\n\u003ctd\u003e26 1\/4\" H x 31\" W x 18 3\/8\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlue\u003c\/th\u003e\n\u003ctd\u003e6\" outlet; continuous 6\" liner to the top of the chimney (UL 1777)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClearances (US)\u003c\/th\u003e\n\u003ctd\u003eSide mantle 9\", top mantle 27\", side wall 19\", 84\" to the top from the platform\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping weight\u003c\/th\u003e\n\u003ctd\u003e540 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eOsburn (SBI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eMasonry fireplaces only.\u003c\/strong\u003e Osburn forbids installing the 3500 insert in a factory-built fireplace. It goes only inside a masonry fireplace with a lined masonry chimney, and it is not approved for mobile homes. A certified installer or your local building official should check the installation before the first fire.\u003c\/p\u003e\n\u003ch2\u003eQuestions people ask us\u003c\/h2\u003e\u003ch3\u003eWhat do I need to order with the 3500 insert?\u003c\/h3\u003e\u003cp\u003eOsburn lists three required accessories, sold separately: a \u003cb\u003edoor overlay\u003c\/b\u003e (black or brushed nickel), a \u003cb\u003efaceplate\u003c\/b\u003e (Medium 32\" x 44\" or Large 32\" x 50\") and matching \u003cb\u003efaceplate trims\u003c\/b\u003e. See the \u003ca href=\"\/collections\/osburn-fireplace-trims-fronts\"\u003etrims and fronts\u003c\/a\u003e collection.\u003c\/p\u003e\u003ch3\u003eHow much wood does it hold?\u003c\/h3\u003e\u003cp\u003eLogs up to \u003cb\u003e22\"\u003c\/b\u003e long, loaded across the width or the depth, in a 3.5 cu ft firebox with burns of up to \u003cb\u003e10 hours\u003c\/b\u003e.\u003c\/p\u003e\u003ch3\u003eCan the 3500 insert go in a factory-built fireplace?\u003c\/h3\u003e\u003cp\u003eNo. Osburn states that its wood-burning inserts must only be installed inside an \u003cb\u003eexisting masonry fireplace\u003c\/b\u003e with a lined masonry chimney, never in a factory-built (zero clearance) fireplace or any wooden or combustible structure.\u003c\/p\u003e\u003ch3\u003eWhat chimney liner does it need?\u003c\/h3\u003e\u003cp\u003eA continuous \u003cb\u003e6\"\u003c\/b\u003e liner from the insert to the top of the chimney, listed to UL 1777 in the US. Liner adapters are in the \u003ca href=\"\/collections\/osburn-chimney-venting-systems\"\u003eventing collection\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eWill it fit my fireplace?\u003c\/h3\u003e\u003cp\u003eThe minimum opening is \u003cb\u003e26 1\/4\" H x 31\" W x 18 3\/8\" D\u003c\/b\u003e. Send us your measurements and we will check it with you. \u003ca href=\"\/pages\/contact-us\"\u003eAsk us here\u003c\/a\u003e.\u003c\/p\u003e","brand":"Osburn","offers":[{"title":"Default Title","offer_id":67630652260626,"sku":"OB03510","price":3819.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/osburn-3500-wood-insert.jpg?v=1792563043","url":"https:\/\/www.aquaterrabackyard.com\/products\/osburn-3500-wood-insert","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}