{"product_id":"builder-s-best-wmf621-foil-duct","title":"Builder's Best WMF621 Foil Duct","description":"\u003cul\u003e\n\u003cli\u003eWire helix multi ply foil duct designed for low to medium operating pressures in HVAC systems\u003c\/li\u003e\n\u003cli\u003eClass 1 Air Connector label meeting NFPA (90A and 90B).\u003c\/li\u003e\n\u003cli\u003eTear and Puncture Resistant\u003c\/li\u003e\n\u003cli\u003eEncapsulated wire helix does not unravel when cut to length\u003c\/li\u003e\n\u003cli\u003eAir tight construction and smooth inner core\u003c\/li\u003e\n\u003cli\u003eSteel Wire Support Note: Not for use to vent appliances for cooking, heating, and clothes drying unless approved and recommended by the appliance manufacturer\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e \u003cstrong\u003ePRODUCT SPECIFICATIONS\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eWire helix duct with steel wire support\u003c\/li\u003e\n\u003cli\u003eMulti-ply design of aluminum\/polyester laminate and metalized polyester\u003c\/li\u003e\n\u003cli\u003ePRO Performance LevelUL® 181, Class 1 air connector label;\u003c\/li\u003e\n\u003cli\u003eUL® sticker every 10 feet\u003c\/li\u003e\n\u003cli\u003e3\" dia. has ¾\" pitch; 4–12\" dia. has 1\" pitch\u003c\/li\u003e\n\u003cli\u003eMaximum velocity rating 5000 fpm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Builders Best","offers":[{"title":"4'' x 5'","offer_id":51310346862823,"sku":"17316308","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0672\/1536\/0231\/files\/product-media-453320.webp?v=1756021537","url":"https:\/\/fletcherlawnandgarden.com\/products\/builder-s-best-wmf621-foil-duct","provider":"Fletcher Lawn \u0026 Garden Hardware","version":"1.0","type":"link"}