Thanks for the replies on the variable speed fan question. It might not be economical to make the vent fan variable speed.
The next question is, if a 20 in. fan with a 1/3 hp 1750 rpm motor is being installed for a 9 x 12 chicken coop. Is it going to be too much ventilation? I don't want to be sucking chickens out the wall!
Bird numbers will vary, but probably a couple dozen in summer and half that in winter. Wisconsin climate, with windows and vents for air entry.
The next question is, if a 20 in. fan with a 1/3 hp 1750 rpm motor is being installed for a 9 x 12 chicken coop. Is it going to be too much ventilation? I don't want to be sucking chickens out the wall!
Bird numbers will vary, but probably a couple dozen in summer and half that in winter. Wisconsin climate, with windows and vents for air entry.