New installation with Simpson Duravent PV. Smoke leaks out of the factory seams only - none from my joints where I put red High Temp RTV silicone sealant. On the first install I got a small amount of smoke leaking only at the factory seams in the elbow. I put some RTV sealant on it, and got it mostly fixed, but having paid $38 I wasn't satisfied with it and returned the elbow to the store as defective. I picked up another one off the shelf. This one leaks worse. It's very noticeable on start up, with a smaller stream once the heat gets going, but still plainly evident with a flashlight. My thought is that there should be NO smoke leaking from any where in the pipe. With 2 successive problems I'm willing to think I'm either doing something wrong or expecting too much. Setup: Whitfield Quest. 3" Duravent PV pipe. Cleanout T at stove to 3' vertical to 6" vertical to 90 degree elbow to 2' horizontal to horiz. cap. Pipe support on vertical to stabilize. Vertical confirmed plumb with a level. In the first install I had a 1/2" rise on the horizontal as it went through the wall between the elbow and cap. On the second install I have it very close to no rise (to insure that the 90 degree elbow is not being "stretched" to 95 degrees due to pipe angles). The smoke is coming mainly from the angled shoulders. Is it normal to get some leakage from the elbow at startup? What are the chances that I got 2 defective elbows in a row? Any advice would be greatly appreciated. Thanks.