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.
Listed Length | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Diameter | 14" | 16" | 18" | 20" | 22" | 24" | 26" | 28" | 30" | |
3' | 14R3 | 16R3 | 18R3 | 20R3 | 22R3 | 24R3 | 26R3 | 28R3 | 30R3 | |
24" | 14R24 | 16R24 | 18R24 | 20R24 | 22R24 | 24R24 | 26R24 | 28R24 | 30R24 | |
18" | 14R18 | 16R18 | 18R18 | 20R18 | 22R18 | 24R18 | 26R18 | 28R18 | 30R18 | |
12" | 14R12 | 16R12 | 18R12 | 20R12 | 22R12 | 24R12 | 26R12 | 28R12 | 30R12 |