https://www.amazon.com/gp/product/B0BMGSBJQT/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
I got this one last month for our coop. In case the link doesn't work it's blessny solar exhaust fan. We put this in the bottom of our duck coop. it doesn't have a battery so it only runs during the...