I have a Napolean BDG34NT installed in my basement. I hadn't ran it much up until now, but I did run it a few times to test it out. Now that I have finished the enclosure and the drywall I get some pretty bad noises after the fireplace goes off - they sound like duct expansion noises. Is this common in a fireplace? Does anyone have any ideas about how I might reduce or eliminate the noise? It is funny that it didnt happen before I finished the enclosure so I could have addressed it then
Any help is appreciated, even comments on how frequent this occurs...