I have not experienced the yellow spots yet. BUT I do leave my bathroom vent open very little year round for the condensation. I have maxxair roof vent covers so this helps. BUT I have always kept the vent in the bathroom cracked. I would do the kitchen but need a 12 foot ladder to get to that one
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Speaking of kitchen vent. Why did Cougar only put a vent cover over the kitchen vent and not the bathroom vent or bedroom before I added second AC?
randy