DuraVent FasNSeal W2 Stepped Reducer: a short size change where a tapered fitting won’t fit
The DuraVent FasNSeal W2 Stepped Reducer is a short double wall stainless steel fitting that connects a larger vent section to a smaller one. It narrows the exhaust passage in one step rather than through a longer taper. That makes it useful where there isn’t enough room for a tapered reducer. 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. The 1/2 inch air space helps shield heat, allowing the vent to sit closer to materials that can burn.
Choose the size change your run calls for: 7 to 5 inch or 12 to 10 inch. These measurements describe the inside vent sizes, not the outer jacket. The outside is 1 inch larger than the vent size, which matters in a wall or between floor joists. An experienced professional fits the run using FasNSeal parts throughout. Need the single wall fitting? See the DuraVent FasNSeal Stepped Reducer single wall fitting. The DuraVent FasNSeal W2 Stepped Reducer 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:








































