These universal heater exhaust kits come complete with everything needed to vent a gas heater up to 3' (additional pipe and/or a drip tee may be required for some units). These 3' stainless steel, gas tight, category 3 vent systems are approved for horizontal installation in residential and commercial applications for gas unit heaters. Most durable, longest lasting, and lowest maintenance vent system available for Mr. Heater, Modine Hot Dawg, Dayton, Reznor, and other brands of gas unit heaters.

4" Garage / Shop Heater Vent Kit Includes
For structures with an exterior wall 4" to 7" thick.
(1) heater adapter, (1) 36" vent pipe, (1) wall thimble, and (1) termination cap

4" Greenhouse Heater Vent Kit Includes
For greenhouses and structures with walls less than 4" thick.
(1) heater adapter, (1) 36" vent pipe, (1) firestop flashing, (1) storm collar, and (1) termination cap

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 corrosion resistant 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 316L corrosion resistant 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

Item # 46501, 4650109, 4650108C