That is a really nice setup you have there! My only thing is those darned box fans...I have experienced two of them burning up before. One in my house. One at work. Both were in low dust situations with no sign of going bad. The one in my house was actually recalled for fire hazard later...
People do not realize how easy a fan catches fire when dust gets in the motor! I have a ton of ventilation in a large coop. I don't need the fan either but my birds love it. I don't mind it either since my coop is a walk in and I can step in to slow the sweat down lol.
I grew up one block from...
Last month, I picked up this fan https://www.walmart.com/ip/Hyper-Tough-Sealed-Motor-Drum-Fan-with-Wall-Mount-20-Inches/334273417 from Walmart. Its a sealed motor shop fan, so it's much safer for in a dusty coop, than a standard motor fan. This thing moves a TON of air! Possibly a negative for...