I have a garage full, a 20' bass boat, an Enclave, golf cart, etc. I had a ceiling fan installed above my workbench. I don't open the attic panel/step for ventilation, I took a hole saw and sawed many holes in the attic panel and this is full time ventilation. I use the garage screen door whenever possible for ventilation. I lower the main garage door to about a foot short of closing, it keeps the rain out and also ventilates at the same time.
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