DuraVent FasNSeal Weil McLain CG Series and Williamson Thermoflo GWI Series Appliance Adapter: connects FasNSeal to the listed CG and GWI appliances
The DuraVent FasNSeal Weil McLain CG Series and Williamson Thermoflo GWI Series Appliance Adapter is a 3 inch adapter that connects a FasNSeal vent to an appliance’s exhaust outlet. DuraVent lists it for Weil McLain CGi, CGs, and CGt boilers and the Williamson Thermoflo GWI. 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 vent uses FasNSeal parts all the way from the appliance to the outdoors. Do not mix in another vent maker’s pipe, fittings, or joining methods, since their connections and seals differ. The pipe also needs separate support from hangers and wall brackets. Each floor or ceiling crossing needs a firestop, a barrier around the pipe at the opening. Looking for the GV Series connection? See the DuraVent FasNSeal Weil McLain GV Series Appliance Adapter. The DuraVent FasNSeal Weil McLain CG Series and Williamson Thermoflo GWI Series Appliance Adapter 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:








































