Using tables from the National Fuel Gas Code or our Sizing & Application Guide, determine the diameter of venting required. The Sizing & Application Guide also offers tips on good design including multi-appliance system sizing and design. The System Design and Installation Guide is an additional resource.
The reducing tee features a branch with a smaller diameter than its trunk size, and provides a convenient connection of the furnace and water heater to a common vent.
Model | Tee | Branch |
---|---|---|
4ET-3 | 4" | 3" |
5ET-3 | 5" | 3" |
5ET-3 | 5" | 4" |
6ET-3 | 6" | 3" |
6ET-4 | 6" | 4" |
6ET-5 | 6" | 5" |