jp buchanan
10-16-2009, 08:20 AM
A newly installed gas hot water heater I inspected recently had a small blower fan installed at the base of the vent stack that had a horizontal run of approximately 3 ft. before it exited the adjacent wall, which then had a vertical stack of approx. 5 ft. before it exited the roof. This is the first time I've seen this condition (Florida) but I was informed by a local HVAC company that this was an acceptable method of facilitating the exhaust of the combustion air. Has anyone seen this condition before and if so what state and what are the pros and cons.