Type B Gas Vents are for venting listed natural gas or liquid propane Category I appliances. The appliances listed below typically, but not always, use Type B gas vent systems:
• Furnaces • Water Heaters
• Boilers • Room Heaters
• Decorative Gas Appliances
• Floor Furnaces • Unit Heaters
M&G Dura-Vent Type B gas vent systems may be used on other gas-burning appliances, provided the manufacturer of the appliance states in their installation instructions that Type B gas vent is acceptable. DO NOT use Type B gas vent for Category II, III, or IV gas appliances.