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Check out this article from the HPBA (Hearth, Patio, and Barbeque Association....

It seems obvious to most people that the chimney of a wood-burning fireplace is going to need annual cleaning because of the buildup of soot and creosote. A gas fireplace, on the other hand, burns nice and neat. So, why is it important to get the chimney for a gas appliance inspected and cleaned annually? Gas-burning fireplaces are a real convenience and, compared to wood burning, have a low maintenance factor. But there are several potential problems that can occur with gas and with a chimney used for any type of heating system, all of which can become a danger if not resolved.

Buildup

Gas fireplaces sometimes have a buildup of debris. For example, ceramic logs can deteriorate and clog vents.If the exterior chimney has a cracked crown or if th...

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The smell is due to creosote deposits in the chimney, a natural byproduct of woodburning. The odor is usually worse in the summer when the humidity is high and the air conditioner is turned on. A good sweeping will help but usually won't solve the problem completely. There are commercial chimney deodorants that work pretty well, and many people have good results with baking soda or even kitty litter set in the fireplace. The real problem is the air being drawn down the chimney, a symptom of overall pressure problems in the house. Some make-up air should be introduced somewhere else in the house. A tight sealing, top mounted damper will also reduce this air flow coming down the chimney.