I recently hooked up a Breckwell Big E with Simpson Duravent exhaust vent. I've sealed all the joints including the manufactured joints in the 90 degree elbow with silicone rated for pellet stove vent pipe. We are still getting smoke seeping out somewhere but cannot see it even with all lights out and using a flashlight. The room where the stove is located has a cathedral ceiling in it and when we put on the ceiling fan your eyes nearly begin to burn with the smoke the fan pushes back down on you. Any idea what I can do to eliminate the smoke seepage?