DuraVent FasNSeal Adjustable Vent Length: a sliding section that fills gaps without cutting pipe
The DuraVent FasNSeal Adjustable Vent Length is a sliding section of stainless steel vent pipe. This 18 inch piece slides inside a plain length to reach an elbow or appliance without cutting pipe. At least 4 inches must remain inside for the seal, leaving up to 12 inches of adjustment. Choose a 3 to 16 inch size on this page. 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.
DuraVent favors this adjustable piece over trimming plain pipe. A professional can cut single wall FasNSeal only at its narrower end, leaving at least 2 inches for the seal, cutting straight, and sanding away rough edges. Cutting plain pipe does not make it adjustable. Each label has an arrow showing exhaust direction. Horizontal pipe must rise away from the appliance at least 1/4 inch per foot so the liquid condensate returns to the drain. Need double wall pipe? See the DuraVent FasNSeal W2 Adjustable Vent Length, the double wall version. The DuraVent FasNSeal Adjustable Vent Length ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

















































