This is the 2nd year in a row that I have tiny pin holes on my direct vent pipe. This is the OEM pipe that comes with the direct vent setup for an Alaska Channing 3 stove. The pipe seems very thin. There are maybe 5 pin holes. Last year I had many more. I was thinking of just taping the whole pipe with a thick aluminum pipe. I can buy a doubled wall pipe but I'm not sure if I can bend it like the thinner pipe I have now. Am I getting pin holes because I didn't clean out the pipe as soon as I shut it off? Does anyone have a source for direct vent piping?