Category 3 Venting System

Category iii refers to positive vent pressure which is created by exhaust blowers in unit heaters.

Category 3 venting system.

These vent systems must be constructed of al29 4c stainless steel contain gaskets for sealing and have a built in mechanical locking band among other requirements. In other words in a category i venting system if there is a leak in the venting system air from the space will flow into the flue pipe and no flue gas will flow into the space. Zflex cat 3 stainless flue pipe 4 inch. Category iii refers to positive vent pressure which is created by exhaust blowers in unit heaters.

In short it is a us standard for gas venting systems required in category iii applications. Heatfab nbsp is the leading manufacturer of high quality venting systems for special gas vent applications specified by oems for nbsp over 20 years. Boilers water heaters and furnaces. Z vent was developed in the early 1980s and has thousands of field installations to date.

Time tested installations throughout north america and globally. Ansi category i ii ii and iv appliances. Z vent is now manufactured utilizing a fail safe gasket connection. Category iii vent pipe al29 4c for use in boilers tankless water heaters pool heaters and other appliances requiring category iii stainless vent pipe or category 3 vent pipe.