The heater adapter has a silicone gasket and locking band on one end to connect to the category 3 piping and a universal screw mount on the opposite end for connecting to the heater. Heater adapters are required to secure the category 3 venting to a gas unit heater. Adapters fit most standard gas unit heaters including: Modine, Sterling, Mr. Heater, Reznor, ADP, and Dayton brands (other heater brands may need some minor modifications for assembly). 3" and 4" universeal adapters include 3 oz. of high temp silicone for sealing the adapter at the heater. The 5" adapter has gaskets on both ends and is made for Sterling gas heaters. The stainless steel heater vent pipe and fittings feature patented built-in mechanical locking band and triple-lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90° from mechanical locking bands. All pipe and fittings are UL1738 approved for category II, III and IV venting applications.
What is UL 1738? In short, it is a US standard for gas venting systems required in category 3 applications. Category 3 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. All category 3 vent pipe and fittings offered are single wall.
- Made of AL29-4C® super-ferritic stainless steel
- Built-in high temp silcone gaskets for air tight seal
- Built-in locking band to insure a secure fit (no hardware needed)
- UL1738 approved for category 3 venting applications
- Limited lifetime warranty
Item # VF 4650170, 4650175, 4650176, 4651175, 4651176, 4651315