It is prohibited to vent an appliance through a pipe chase.

It is prohibited to vent an appliance through a pipe chase.

• A. True
• B. False
• C. Not specified
• D. Sometimes

Answer: (A)

Venting combustion appliance exhaust must go through a dedicated vent system that terminates outdoors and is designed to prevent backdrafting and leakage of combustion byproducts. A pipe chase is an enclosed vertical shaft used for plumbing or electrical runs and is not designed or rated to carry exhaust gases. If exhaust is routed through a chase, it can back up into interior spaces, create a carbon monoxide hazard, and allow heat or fire to spread between building areas. It also introduces maintenance and blockage risks since chases can collect moisture, debris, or other systems’ materials. To ensure safe operation, vent directly to the outdoors with the proper vent materials, clearances, and termination details.

Venting combustion appliance exhaust must go through a dedicated vent system that terminates outdoors and is designed to prevent backdrafting and leakage of combustion byproducts. A pipe chase is an enclosed vertical shaft used for plumbing or electrical runs and is not designed or rated to carry exhaust gases. If exhaust is routed through a chase, it can back up into interior spaces, create a carbon monoxide hazard, and allow heat or fire to spread between building areas. It also introduces maintenance and blockage risks since chases can collect moisture, debris, or other systems’ materials. To ensure safe operation, vent directly to the outdoors with the proper vent materials, clearances, and termination details.