DuraVent FasNSeal Tall Cone Flashing: a 12 inch seal around a flat roof vent
The DuraVent FasNSeal Tall Cone Flashing is a roof flashing that seals the opening where a vent passes through a flat roof. Its cone stands 12 inches tall. For a single wall vent, DuraVent requires a tall cone roof jack inside the flashing as a heat shield, plus a storm collar above it. Both are sold separately. A FasNSeal W2 double wall vent needs only the storm collar and uses flashing the same size as 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 your vent size on this page, from 3 to 16 inch. The vent pipe has welded stainless steel seams. An experienced professional handles the installation, and DuraVent calls for a qualified inspector to check the complete vent each year. Planning a single wall roof exit? See the DuraVent FasNSeal Tall Cone Roof Jack heat shield. The DuraVent FasNSeal Tall Cone Flashing 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:








































