DuraVent FasNSeal W2 Double Wall Wye: a 45 degree branch for an approved shared vent
The DuraVent FasNSeal W2 Double Wall Wye is a stainless steel fitting that joins a branch to a shared vent run. Its branch enters at 45 degrees rather than 90 degrees, giving exhaust from a second boiler a path with less resistance. Appliances can share the vent only when the appliance maker approves it. FasNSeal W2 is DuraVent’s double wall stainless steel vent for high efficiency gas boilers, furnaces, and water heaters, with an air space between its two walls.
Choose a 6, 7, 8, 9, 10, 12, 14, or 16 inch size on this page. Each of the three connections has the same diameter. The 1/2 inch air gap helps shield nearby wood framing from heat, allowing the vent to sit closer to materials that can burn. DuraVent recommends this construction for commercial and apartment buildings, as well as house vent runs within walls or between floor joists. Need the single wall fitting? See the DuraVent FasNSeal Single Wall Wye fitting. The DuraVent FasNSeal W2 Double Wall Wye 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:








































