The drain tube kit can be used with the category 3 Drip tees that we offer (Not compatible with the 5" drain fitting). The condensate tube is made of 3/8" (I.D.) high temperature rated silicone to prevent corrosion and should be filled with water to prevent gases from coming out of the tubing. The tubing should be fed into either a drain or a collection bucket through some form of piping or tubing. Each kit includes 3/8" silicone tubing, clamp to attach to pipe fitting and zip tie to form the loop. 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.
Features
- 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