I have a 2000 sq. ft. barn/workshop with a mezzanine running the 60 ft. length and about 1/3 the width of the space. Because of the mezzanine the center peak is about 30 ft. high. I have a couple of workshop type air cleaners to install. Would it be better to install them high toward the peak or below the mezzanine? There are two gable end vents. Would it be a good idea to exhaust the cleaners out through them?