DuraVent FasNSeal W2 Adjustable Vent Length: a sliding section for the inches between fixed lengths
The DuraVent FasNSeal W2 Adjustable Vent Length is an 18 inch sliding section of double wall stainless steel vent pipe. It slides inside a plain W2 length to fill the gap that fixed lengths leave. This is how a professional fine tunes the fit, since W2 pipe cannot be cut to length. 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. At least 4 inches must remain inside the plain length to keep the seal, allowing up to 12 inches of adjustment.
Used upright, this section also helps set the horizontal run’s rise of 1/4 inch per foot toward the drain. Choose a size from 3 to 16 inch on this page to match your planned vent. The joints seal with a gasket and hold together with a locking band built into the wider end. Allow for 2 inches of overlap at each joint when planning the run. Need the single wall part? See the DuraVent FasNSeal Adjustable Vent Length single wall section. The DuraVent FasNSeal W2 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:








































