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.
Model | Size | Dim. A | Dim. B |
---|---|---|---|
4OBC | 4" | 3" | 11 1/2" |
5OBC | 5" | 3" | 12 7/8" |