You might try hanging a small towel with the bottom in a bucket of water adjacent to the air intake. It will wick up the water as it drys out. If that doesn’t work add a humidifier to the setup. If that doesn’t work put your exhaust fan on a timer. The timer is a last ditch effort because I think the fresh air is very important for your plants.
Add a few ounces of H2O2 to your water bucket to keep any microbes from brewing up.
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