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 standard wye features the branch, trunk, and base diameter with the same size.
The reduction wye features a branch and/or base with a smaller diameter than the trunk size, and provides a convenient double-wall connection to furnace or water heater in a common connector.
Model | Size | A | B | C | D |
4EY | 4" | 4 1/2" | 4 1/2" | 4 1/2" | 9" |
4EY-3 | 4" | 4 1/2" | 3 1/2" | 4 1/2" | 9 |
5EY-3 | 5" | 5 1/2" | 3 1/2" | 5 1/2" | 9" |
5EY-4 | 5" | 5 1/2" | 4 1/2" | 5 1/2" | 10 1/2" |
5EY-33 | 5" | 5 1/2" | 3 1/2" | 3 1/2" | 12" |
5EY-34 | 5" | 5 1/2" | 3 1/2" | 4 1/2" | 12" |
5EY-43 | 5" | 5 1/2" | 4 1/2" | 3 1/2" | 13 1/2" |
5EY-44 | 5" | 5 1/2" | 4 1/2" | 4 1/2" | 13 1/2" |
6EY-3 | 6" | 6 1/2" | 3 1/2" | 6 1/2" | 9" |
6EY-4 | 6" | 6 1/2" | 4 1/2" | 6 1/2" | 10 1/2" |
6EY-5 | 6" | 6 1/2" | 5 1/2" | 6 1/2" | 12" |