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Heating Appliances


Furnaces, Steam Boilers, Water Boilers, Water Heaters, Pool Heaters, Laundry/Dryer Exhaust, Building Heating Equipment, Gas Fireplaces, etc.
Appliance Vent Categories
  Negative pressure venting Positive pressure venting
noncondensing 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
condensing 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)
                         Corr/Guard - Special Gas Vent (CG, FCS)
Category IV -   Corr/Guard - Special Gas Vent (CG, FCS)
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