DuraVent FasNSeal Insulated Wall Thimble with Adjustable Vent Length: an insulated wall sleeve with room to adjust
The DuraVent FasNSeal Insulated Wall Thimble with Adjustable Vent Length is a sleeve that carries the vent through an outside wall made of materials that can burn. Its adjustable pipe section lets the installer position the run without cutting pipe. Insulation keeps cold outdoor air from coming in around the vent. FasNSeal is DuraVent’s stainless steel vent for high efficiency gas boilers, furnaces, and water heaters, built to carry pressurized exhaust and its acidic condensate outside. Choose a 3 to 16 inch size. The 3 to 5 inch sizes fit walls 4 1/4 to 8 1/2 inches thick. Larger sizes fit walls 5 3/4 to 11 1/2 inches thick.
The outside vent end must sit at least 12 inches above both ground and the snow line, or higher if the appliance maker requires it. Unless the appliance has its own drain, a FasNSeal drain belongs near the appliance to collect acidic condensate. Your installer must also account for drainage along the run and distances from nearby openings. Need the double wall version? See the DuraVent FasNSeal W2 Insulated Wall Thimble with Adjustable Vent Length. The DuraVent FasNSeal Insulated Wall Thimble with Adjustable Vent Length ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.








Commercial projects may require custom parts and unique system designs. Duravent offers complete project assistance:








































