{"product_id":"duravent-8dp-cs11-8-x-11-duraplus-black-square-ceiling-support-box","title":"DuraVent 8DP-CS11 8\" x 11\" DuraPlus Black Square Ceiling Support Box","description":"\u003cp data-path-to-node=\"1\"\u003e\u003cspan\u003eBuild the perfect custom venting system for your heating appliance with the DuraVent 8\" x 11\" DuraPlus Black Square Ceiling Support Box.\u003c\/span\u003e\u003cspan\u003e Designed for exceptional performance and long-lasting durability,\u003c\/span\u003e\u003cspan\u003e this versatile structural component is expertly engineered for use with flat,\u003c\/span\u003e\u003cspan\u003e vaulted,\u003c\/span\u003e\u003cspan\u003e or cathedral ceilings (always refer to the DuraPlus Ceiling Pitch table to determine the exact support box size needed for your roof slope).\u003c\/span\u003e\u003cspan\u003e Featuring an 8-inch inside diameter and an 11-inch box height (A),\u003c\/span\u003e\u003cspan\u003e this heavy-duty square support box is capable of securely supporting up to 35 feet of triple-wall DuraPlus chimney pipe and comes with a convenient built-in starter section.\u003c\/span\u003e\u003cspan\u003e Painted in a sleek black finish and packaged with matching trim included right in the box,\u003c\/span\u003e\u003cspan\u003e it pairs effortlessly with a compatible adapter to attach DVL or DuraBlack interior stove pipe directly to the unit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003e\u003cspan\u003eEngineered for professional hearth contractors and dedicated DIY homeowners,\u003c\/span\u003e\u003cspan\u003e this premium square ceiling support box (model 8DP-CS11) guarantees a fast,\u003c\/span\u003e\u003cspan\u003e reliable assembly for a fully code-compliant installation.\u003c\/span\u003e\u003cspan\u003e Tested and listed to strict UL 103 HT safety standards and backed by a limited-lifetime warranty,\u003c\/span\u003e\u003cspan\u003e it provides dependable,\u003c\/span\u003e\u003cspan\u003e long-term structural bracing for your high-temperature all-fuel venting system.\u003c\/span\u003e\u003cspan\u003e As with all DuraPlus installations,\u003c\/span\u003e\u003cspan\u003e always remember to maintain a strictly mandatory 2-inch minimum airspace clearance to all combustible materials throughout your main chimney run.\u003c\/span\u003e\u003cspan\u003e Complete your residential wood stove or fireplace exhaust setup safely today with this indispensable DuraPlus support component!\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"station-tabs-tabtitle\"\u003e\u003cspan id=\"station-tabs-tab_ht-i0-t9\" class=\"station-tabs-tab is-active\" aria-controls=\"station-tabs-tabpanel_ht-i0-t9\" data-slug=\"whats-included\" role=\"button\" aria-expanded=\"true\" tabindex=\"0\"\u003e\u003cspan class=\"station-tabs-tabtext\"\u003eIncluded\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"station-tabs-tabpanel is-active\" id=\"station-tabs-tabpanel_ht-i0-t9\" aria-labelledby=\"station-tabs-tab_ht-i0-t9\" role=\"region\" aria-hidden=\"false\"\u003e\n\u003cdiv class=\"station-tabs-tabcontent\"\u003e\n\u003cul\u003e\n\u003cli\u003eCeiling Support Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"station-tabs-tabtitle\"\u003e\u003cspan id=\"station-tabs-tab_ht-i0-t13\" class=\"station-tabs-tab is-active\" aria-controls=\"station-tabs-tabpanel_ht-i0-t13\" data-slug=\"features\" role=\"button\" aria-expanded=\"true\" tabindex=\"0\"\u003e\u003cspan class=\"station-tabs-tabtext\"\u003eFeatures\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"station-tabs-tabpanel is-active\" id=\"station-tabs-tabpanel_ht-i0-t13\" aria-labelledby=\"station-tabs-tab_ht-i0-t13\" role=\"region\" aria-hidden=\"false\"\u003e\n\u003cdiv class=\"station-tabs-tabcontent\"\u003e\n\u003cul\u003e\n\u003cli\u003eUse with flat, vaulted, or cathedral ceilings.\u003c\/li\u003e\n\u003cli\u003eSquare Ceiling Support Box is painted black.\u003c\/li\u003e\n\u003cli\u003eRefer to Ceiling Pitch table to determine size of support box needed.\u003c\/li\u003e\n\u003cli\u003eSupports up to 35’ of DuraPlus Chimney. Starter Section built-in.\u003c\/li\u003e\n\u003cli\u003eFor adapters, see DVL and DuraBlack section.\u003c\/li\u003e\n\u003cli\u003eTrim included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"station-tabs-tabtitle\"\u003e\u003cspan id=\"station-tabs-tab_ht-i0-t21\" class=\"station-tabs-tab is-active\" aria-controls=\"station-tabs-tabpanel_ht-i0-t21\" data-slug=\"specifications\" role=\"button\" aria-expanded=\"true\" tabindex=\"0\"\u003e\u003cspan class=\"station-tabs-tabtext\"\u003eSpecifications\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"station-tabs-tabpanel is-active\" id=\"station-tabs-tabpanel_ht-i0-t21\" aria-labelledby=\"station-tabs-tab_ht-i0-t21\" role=\"region\" aria-hidden=\"false\"\u003e\n\u003cdiv class=\"station-tabs-tabcontent\"\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"50%\"\u003eItem Number\u003c\/td\u003e\n\u003ctd width=\"50%\"\u003e8DP-CS11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"50%\"\u003eSeries\u003c\/td\u003e\n\u003ctd width=\"50%\"\u003eDuraPlus (6\"-8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eCeiling Support Box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInside Diameter\u003c\/td\u003e\n\u003ctd\u003e8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA\u003c\/td\u003e\n\u003ctd\u003e11”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical Dimensions\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0718\/5022\/9802\/files\/DTDP_-_Square_Ceiling_Support_Box_2e45b8f3-559a-4d08-af53-3fe1f1940bd6.png?v=1792929268\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWarranty\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.2979%;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0718\/5022\/9802\/files\/ChatGPT_Image_Jun_18_2026_02_25_23_PM.png?v=1781771144\" alt=\"\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 54.3543%;\"\u003eDuravent, Inc. (“Duravent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, Duravent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"color: rgb(255, 128, 0);\"\u003e\u003cspan style=\"color: rgb(48, 48, 48); font-size: 0.875rem;\"\u003eAbout The Manufacturer\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(48, 48, 48); font-size: 0.875rem;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0718\/5022\/9802\/files\/Duravent_Logo.png?v=1789738697\" alt=\"\" width=\"411\" height=\"124\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eDuraVent is a leading manufacturer of high-quality chimney and venting systems for residential and commercial applications. The company provides reliable solutions for wood, gas, pellet, and oil-burning appliances. Its products are rigorously tested to meet strict safety standards in the United States and Canada. DuraVent systems are engineered for durability, dependable performance, and long-term protection. Innovative features such as twist-lock connections help make installation faster, easier, and more secure. Trusted by homeowners and industry professionals, DuraVent is a recognized leader in venting technology.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"DuraVent","offers":[{"title":"Default Title","offer_id":53133765902623,"sku":"8DP-CS11","price":282.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/5022\/9802\/files\/DuraVent_8DP-CS36_8_x_36_DuraPlus_Black_Square_Ceiling_Support_Box.jpg?v=1792929699","url":"https:\/\/ridgeflame.com\/products\/duravent-8dp-cs11-8-x-11-duraplus-black-square-ceiling-support-box","provider":"Ridge Flame","version":"1.0","type":"link"}