I am planning to install an insulated exterior grade door on a finished furnace room in my basement. The room will have a hot air supply register but i read that I cannot put in a return because i can cause a back-draft. This scenario will cause a positive pressure. Is positive pressure bad for a furnace room?

  • Will that room have any gas appliances in it? You would need a fresh air intake then, which would prevent any pressure differential. – Dotes Apr 22 '19 at 3:42

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