On ours we have an 1/8 inch gap all the way around the damper and with the vacuum created by the thrust of those two big blowers all kinds of humid outside air will be sucked in. The consensus is that any air that is allowed to leak in at this point will hurt the performance of the A/C and that is no good. Right ED?
A humidifier is usually only required in the winter I would turn it down or off in the summer.
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