It 's been very windy here in SE Massachusetts this weekend. For the first time since the insert was installed in Sept. 2008, I'm getting noise from what I think is the chimney. It's a sort of humming, buzzing vibration when the wind picks up. We have a stainless steel liner inside a 2-story brick chimney, with about 6 inches of pipe above the top of the brick with a metal cap on top. I'm guessing that the top of the pipe or the cap is vibrating in the wind and the liner is conducting the sound down into the stove. I've never had this sound before (that I'm aware of) and I'm concerned that something may be loose on top. Has anyone experienced this kind of noise and is it anything to be concerned about? It's kind of annoying, to be honest.