System 636 PVC flue gas venting system offers regular and increaser couplings to help meet manufacturers recommended installation practices.
- Suitable for use on appliances with flue gas temperatures up to and including 65°C
- Suitable for most residential installations
- When retrofitting existing water heaters, furnaces or boilers, do not connect System 636 certified vent systems to existing, non-certified appliance vent materials
- Certified to ULC S636
- Defined as Type BH Class II A 65°C venting
- 3 x 2" reducer coupling H x H