I want to add a gable fan in my garage to help cool it and help to let out the humidity in the winter. My garage doesn't have a high peak, so there is about 24" of height at the peak on the gable and about 12" between the 2x4 vertical supports. It would seem that I would need to cut out a support in order to fit in a fan. Is this correct and what is the proper way to support the roof if a 2x4 needs to be removed in order to fit in the fan? Would it make more sense to do a roof mounted fan instead?