I plan to install a couple of air filtration units tomorrow and haven't decided whether to use chains or steel cable for hanging. I was going to use 3/4" channel strut or angle iron suspended from 3/8" rod but decided that was overkill. Based on a previous discussion here I plan to install the units below some rafter ties that are about 10 ft. high. Apparently that would be better than to installing them higher toward the 30 ft. open peak. Since the units will be closer to one wall the drop from the rafters will be about 4 to 5 ft. Should I be concerned with the units moving around suspended that distance?