{"product_id":"builders-best-110224-ul-181-flexible-foil-ventilation-duct-4-x-8-aluminum-polyester","title":"Builder's Best UL 181 Flexible Foil Ventilation Duct, 4\" x 8', Aluminum\/polyester","description":"\u003cp\u003eThis wire helix product features steel wire support with a multi-ply design of metalized polyester and aluminum\/polyester laminate. It is UL® 181 listed and labeled as a Class 1 Air Connector.\u003c\/p\u003e\n\u003cp\u003eUL® 181, Class 1 air connector label\u003cbr\u003eMulti-ply design of metalized polyester and aluminum\/polyester laminate\u003cbr\u003eSteel wire support\u003cbr\u003e3″ dia. has ¾” pitch\u003cbr\u003e4–12″ dia. has 1″ pitch­\u003cbr\u003eUL® sticker every 10 feet\u003cbr\u003eMaximum velocity rating 5000 fpm\u003c\/p\u003e","brand":"Builders Best","offers":[{"title":"4\" x 8'","offer_id":44040373633263,"sku":"17316316","price":21.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0650\/9720\/3951\/files\/product-media-333922.jpg?v=1772874146","url":"https:\/\/burtslumber.com\/products\/builders-best-110224-ul-181-flexible-foil-ventilation-duct-4-x-8-aluminum-polyester","provider":"Burt's Lumber \u0026 Building Supply","version":"1.0","type":"link"}