For an appliance designed for a special venting system, what venting is permitted?

For an appliance designed for a special venting system, what venting is permitted?

• A. It may be vented using Type L vent.
• B. It may be vented using BH vent.
• C. It may be vented using B vent.
• D. It cannot be vented using B vent.

Answer: (C)

Venting must match what the appliance is listed to use. If an appliance is designed for a special venting system, you can only vent it with that listed system. In this case, the unit is listed for B vent, which is a double-wall metal vent designed for natural-draft gas appliances. Using B vent ensures the combustion products are exhausted safely and the draft, temperature, and clearances are appropriate for the appliance. Other vent types (such as Type L or BH) are not listed for this unit and could lead to improper venting, backdrafting, condensation, or CO risks. So, venting with B vent is permitted as long as it follows the manufacturer’s listing and local code requirements.

Venting must match what the appliance is listed to use. If an appliance is designed for a special venting system, you can only vent it with that listed system. In this case, the unit is listed for B vent, which is a double-wall metal vent designed for natural-draft gas appliances. Using B vent ensures the combustion products are exhausted safely and the draft, temperature, and clearances are appropriate for the appliance. Other vent types (such as Type L or BH) are not listed for this unit and could lead to improper venting, backdrafting, condensation, or CO risks. So, venting with B vent is permitted as long as it follows the manufacturer’s listing and local code requirements.