Originally Posted By: anatol polillo
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Had an inspection today. Forced hot air/cooling system. The hot water heater and furnace were in an enclosed room in the basement. There was an open duct terminating over the waterheater. When the furnace was blowing, there was no flow I could detect. No idea if it was a return or supply duct. If it is a return, it is way to close, in my opinoin to the water heater and furnace. Lack of flow makes me feel it is not a supply.
I wrote it up as a possible hazard if it is a return duct. Any other ideas???
Also, the exaust fan was turning when the furnace was not firing. It was not on, just freewheeling, and counter to the direction it turns when the furnace is on. Is this an example of backdraft?