DuraVent FasNSeal Termination Box: a box shaped ending for a vent through the wall
The DuraVent FasNSeal Termination Box is a small box that finishes a vent outside a wall. It directs exhaust to the side and keeps debris out. Choose a 3 or 4 inch size to match your 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.
Location matters. The outlet must sit at least 12 inches above ground and the snow line, and 7 feet above a public walkway or driveway. Keep it 6 feet from any appliance air intake and 3 feet from a gas meter or other building opening. Doors and windows need 4 feet below or beside them, or 1 foot above. The appliance instructions may call for more space. The pipe also needs support, with hangers every 6 feet horizontally. Wall brackets go after a turn into a vertical run of 10 feet or more, every 12 feet vertically, and after any offset, or change in the pipe’s path. Each floor or ceiling crossing needs a firestop. Need another size? See the DuraVent FasNSeal Termination Tee wall ending. The DuraVent FasNSeal Termination Box 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:








































