Heating Appliances
Furnaces, Steam Boilers, Water Boilers, Water Heaters, Pool Heaters, Laundry/Dryer Exhaust, Building Heating Equipment, Gas Fireplaces, etc.
Suggested Products:
Category I - Type-B Gas Vent
Category II - Corr/Guard - Special Gas Vent (CG, FCS)
Category III - Pressure Industrial Chimney (PSW, PIC, IPIC-1, -2, -4)
| Appliance Vent Categories | ||
| Negative pressure venting | Positive pressure venting | |
 |
Category I Combustion Efficiency 83% or less Use standard venting Masonry or Type B Vent |
Category III Combustion Efficiency 83% or less Use only pressurizable vent as specified by manufacturer |
 |
Category II Combustion Efficiency Over 83% Use only special condensing service vent as specified by manufacturer |
Category IV Combustion Efficiency Over 87% Use only pressurizable special condensing service vent as specified by manufacturer |
Suggested Products:
Category I - Type-B Gas Vent
Category II - Corr/Guard - Special Gas Vent (CG, FCS)
Category III - Pressure Industrial Chimney (PSW, PIC, IPIC-1, -2, -4)
