Garage Ceiling Fan I Will Be Installing A Solar Powered Attic Fan. Attic Access Is Through A 3'x3' Opening In Garage Ceiling.?

I will be installing a solar powered attic fan. attic access is through a 3'x3' opening in garage ceiling.? - garage ceiling fan

I conclude this opening to provide ventilation openings loom? or are kept open during the winter or summer vacation? The opening is on the opposite side of the attic fan garage is not heated. Thank you!