The one I have came with instructions on how to remove the blade assembly and turn it over to reverse the flow. I just reversed the polarity to make it spin in the other direction. As it is a radiator fan for a car, it's designed to "suck, not blow", and I wanted it blowing under the coop.
It...
@Ragfrey , yes, that is just a piece of Romex I happened to have. It was a classic case of “what do I have laying around I can use to see if this will even work? If it does. I’ll make it nice later.”
Three years and two coops later…
The birds like it.
I direct wired one of these fans:
https://www.amazon.com/gp/product/B00MJO4CRC/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1
to one of these panels:
https://www.amazon.com/gp/product/B018BLW1R4/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
about three years ago and it's been going strong...