Using a box fan like that for intermittent air flow works just fine. Folks should be careful, however, about running these long-term/constantly in a dusty environment. There are a lot of folks in the equestrian world who have done that for summer stall cooling because of cost and suffered tragedy when their barns burned down with loss of equine life. Our woodworking shops are easily as dusty as a barn can be, if not more sometimes, even with good DC. Consumer grade box fan motors are not particularly well suited to the conditions. For a little more investment, one can buy a very nice fan that's rated for the environment and they are even available designed for ceiling and wall mount.