DuraVent FasNSeal Branch Tee: a smaller side opening for a larger vent run
The DuraVent FasNSeal Branch Tee is a stainless steel vent fitting with a side opening smaller than its main passage. It lets a smaller appliance outlet join a larger vent run without a separate fitting to increase the size. It can also connect several boilers to a shared vent, but only when the appliance maker allows that arrangement. 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. The tee can be fitted with a cap or a drain.
Choose a 4 inch main passage with a 3 inch branch, a 5 inch main passage with a 3 inch branch, or a 6 inch main passage with a 5 inch branch. Each connection has a gasket and a locking band built into its wider end. Every joint takes up 2 inches of pipe length, so account for that overlap when planning the run. Need matching openings instead? See the DuraVent FasNSeal Standard Tee with three equal openings. The DuraVent FasNSeal Branch Tee 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:








































