The vents are usually installed when an exhaust fan is placed in the garage ceiling. The fan pulls air in through the vents and exhausts into the attic. Air for the fan operation needs to come from somewhere, either those vents or an open window. Not all garages have windows, thus the vents.
As for the effectiveness of the ceiling fan, your milage will vary.
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Gratitude! The daily practice of finding at least 3 things to be grateful about makes for a happier life.
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