We had an Enviro Mini A installed about a month ago, and it's seems to be working good. However, a couple of days ago, at night, we noticed we could see sparks coming out of the exhaust pipe. The sparks float around in the outside air for a few seconds and then blink out. There seems to be five or six sparks a minute -- not a lot, but enough to make it seem dangerous. It is normal for sparks to come out the exhaust pipe? We had the stove professionally installed by the dealer. The pipe comes away from the house by a couple feet and terminates at a 45 degree bend. More sparks come out when the flame in the stove is tall, and less sparks come out (or no sparks) when the flame is small. Our house is wooden, and there are some trees around -- not a problem with sparks during the rainy season, but we can't have sparks if we happen to run the stove on a cool fall night, when it's dry. Thanks for any advice.