We have recently installed high efficiency natural gas condensing stoves and they use PVC pipes for inlet and outlet instead of chimney ventilation. I was worried about wasps, critters etc so I wanted to keep them away. You have done a great job. The key was to install them with a flange on the inside and some clear silicone to stick on. They are ideal for 2" PVC elbows (i.e. not true 2" pipe). Turn the oven up (I have a two-tier setup) and they stayed in place. Recommend it for this app.
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