I did something dumb and just realized to today. I sealed all of my joins on my simpson duravent pipe with black high temp silicone. I have an Englander BTW. I also sealed around the exhaust motorwhere it goes into the pipe. Now I realize that is dumb because Im going to have to remove it to clean the exhaust motor. Has anyone else sealed around there or is the a collar that fits tight to that? Mine seems to have a large gap around there. Or should I let that gap go because the draft sucks the smoke out?