Hello I recently installed a fresh air intake pvc pipe on my high efficiency furnace this past summer because I made my basement air tight by installing glass block windows well plus to have fresh air would be better option i thought as well but I have a cold air return in each room of my house that has a heater vent now that i have a fresh air intake pvc pipe installed can I block the cold air returns so I just have fresh air coming in? Here is pics of what looks like below before after install
https://photos.app.goo.gl/Q8XhmxWppJFtm7WKA
https://photos.app.goo.gl/j44vnV7Rn4eeLyL16
https://photos.app.goo.gl/xFjeBd1HYo9w3EBeA
https://photos.app.goo.gl/Q8XhmxWppJFtm7WKA
https://photos.app.goo.gl/j44vnV7Rn4eeLyL16
https://photos.app.goo.gl/xFjeBd1HYo9w3EBeA
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