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.

Category 3 venting system.

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. Z vent was developed in the early 1980s and has thousands of field installations to date. In short it is a us standard for gas venting systems required in category iii applications. Time tested installations throughout north america and globally.

Zflex cat 3 stainless flue pipe 4 inch. Z vent is manufactured using al29 4c advanced ferritic stainless steel with unmatched corrosion resistance for use with condensing furnaces and boilers. 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. Category iii refers to positive vent pressure which is created by exhaust blowers in unit heaters.

Category iii refers to positive vent pressure which is created by exhaust blowers in unit heaters. 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. Boilers water heaters and furnaces. Ansi category i ii ii and iv appliances.