Ceiling Fans in Garage

I didn't have the headroom in my garage for a ceiling fan. I have a 7' tall ceiling that is open to the 'attic' above, my trusses are 4' apart. I ended up buying a box fan and attached it to the joist so it is blowing down. In the winter it made a HUGE difference while working in the garage. It hasn't been hot enough this summer to really need it, but the airflow it provides it pretty nice.