Gas Appliance Categories
Gas Appliance Categories : Vented gas appliances are classified for venting purposes into four categories as follows: (1) Category I - An appliance that operates with a non-positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent; (2) Category II - An appliance that operates with a non-positive vent static pressure and with a vent gas temperature that may cause excessive condensate production in the vent; (3) Category III - An appliance that operates with a positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent; (4) Category IV - An appliance that operates with a positive vent static pressure and with a vent gas temperature that may cause excessive condensate production in the vent
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