Category 3 Venting System

Zflex cat 3 stainless flue pipe 4 inch.

Category 3 venting system.

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

Category iii refers to positive vent pressure which is created by exhaust blowers in unit heaters. Ansi category i ii ii and iv appliances. Z vent is manufactured using al29 4c advanced ferritic stainless steel with unmatched corrosion resistance for use with condensing furnaces and boilers. 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.

Z vent is now manufactured utilizing a fail safe gasket connection. Heatfab nbsp is the leading manufacturer of high quality venting systems for special gas vent applications specified by oems for nbsp over 20 years. 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. In short it is a us standard for gas venting systems required in category iii applications.