{"product_id":"duravent-duraplus-7-inner-diameter-square-ceiling-support-box","title":"DuraVent DuraPlus 7\" Inner Diameter Square Ceiling Support Box","description":"\u003cdiv class=\"product__title\"\u003e\n\u003ch3 style=\"text-align: center;\"\u003eDuraVent DuraPlus 7\" Square Ceiling Support Box\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDuraVent DuraPlus 7\" Square Ceiling Support Box\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a durable \u003c\/span\u003etriple-wall chimney system component designed to provide secure structural support for wood stove chimney installations and all-fuel venting systems passing through ceilings. Built with advanced refractory blanket insulation and an air-space barrier, this ceiling support box helps maintain safe clearances while reducing heat transfer to surrounding building materials. Its square design ensures a clean, professional finish for interior chimney installations while improving overall chimney venting system efficiency and safety.\u003c\/p\u003e\n\u003cp\u003eEngineered for continuous operation at flue gas temperatures up to 1000°F, the DuraVent DuraPlus ceiling support box meets strict UL 103HT standards, including one hour at 1400°F and three 2100°F chimney fire tests. This reliable chimney support system component delivers long-lasting durability, code-compliant installation, and dependable performance in residential all-fuel chimney systems.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eVersatile Ceiling Installation Support:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Designed for \u003c\/span\u003e7\" DuraPlus triple-wall chimney systems, the square ceiling support box is ideal for flat, vaulted, and cathedral ceiling chimney installations in wood stove and all-fuel venting systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eBuilt-In Starter Section Design:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Includes an integrated \u003c\/span\u003estarter section, simplifying installation and ensuring a secure connection in residential chimney venting systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHigh Load Capacity Performance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Engineered to support up to \u003c\/span\u003e35 feet of DuraPlus chimney pipe, providing reliable structural support for extended chimney runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eClean Aesthetic Finish:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The \u003c\/span\u003esquare ceiling support box is painted black\u003cspan\u003e, delivering a sleek and professional appearance for visible interior installations.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAdapter Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Works with\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003eDVL and DuraBlack chimney components\u003cspan\u003e when using appropriate adapters for flexible system integration.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eComplete Installation Package:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Includes a\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003etrim kit for finished appearance\u003cspan\u003e, ensuring a clean ceiling transition and proper sealing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProper Sizing Guidance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Always refer to the \u003c\/span\u003eCeiling Pitch Table\u003cspan\u003e to determine the correct support box size for safe and compliant chimney installation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7DP-CS11, 7DP-CS24, 7DP-CS36\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\" (inner)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimension\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e11\" (A) x 18.25\" (W)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClearances\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2\" clearance to combustible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eListings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL Listed to UL 103HT (MH7399)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLimited-lifetime warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003e\u003cstrong\u003eDownloads\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0100\/7917\/4734\/files\/DuraPlus_Brochure.pdf?v=1648525242\" target=\"_blank\"\u003e\u003cstrong\u003eDownload Product Brochure\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0100\/7917\/4734\/files\/DuraPlus_Catalog.pdf?v=1648525281\" target=\"_blank\"\u003e\u003cstrong\u003eDownload Product Catalog\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0100\/7917\/4734\/files\/DuraPlus_Installation_Manual.pdf?v=1648525317\" target=\"_blank\"\u003e\u003cstrong\u003eDownload Installation Manual\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0100\/7917\/4734\/files\/DuraPlus_Installation_Guide.pdf?v=1648525300\" target=\"_blank\"\u003e\u003cstrong\u003eDownload Installation Guide\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0100\/7917\/4734\/files\/DuraPlus_Typical_Installation.pdf?v=1648525356\" target=\"_blank\"\u003e\u003cstrong\u003eDownload Typical Installation\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCalifornia PROP 65:\u003c\/strong\u003e\u003cspan\u003e This product can expose you to Lead \u0026amp; Chromium, which is known to the State of California to cause cancer and birth defects, or other reproductive harm. See \u003c\/span\u003e\u003ca href=\"https:\/\/usfireplacestore.com\/pages\/ca-prop-65-warning\" target=\"_blank\"\u003eWARNING\u003c\/a\u003e\u003c\/p\u003e","brand":"DuraVent","offers":[{"title":"Square Ceiling Support Box \u0026 Trim Collar - 11\" tall","offer_id":53631905693987,"sku":"7DP-CS11","price":428.0,"currency_code":"USD","in_stock":true},{"title":"Square Ceiling Support Box \u0026 Trim Collar - 24\" tall","offer_id":55293332914467,"sku":"7DP-CS24","price":520.0,"currency_code":"USD","in_stock":true},{"title":"Square Ceiling Support Box \u0026 Trim Collar - 36\" tall","offer_id":55293332947235,"sku":"7DP-CS36","price":605.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/6926\/8771\/files\/DuraVent-DuraPlus-7_-Inner-Diameter-Square-Ceiling-Support-Box-DuraVent-Dreamwood-Living-26088049.jpg?v=1783009931","url":"https:\/\/www.dreamwoodliving.com\/products\/duravent-duraplus-7-inner-diameter-square-ceiling-support-box","provider":"Dreamwood Living","version":"1.0","type":"link"}