I am building a 18x40 garage right now. You think one on each side of middle facing the ends would work good? I have garage doors on both ends. I been debating wall fans or floor fans. How loud are they?
First, congratulations on the build! Here's my experience... I run my fan in a 20x20 attached garage. I'm very happy with the range of oscillation and 3 speeds, it moves a lot of air and Global Industries had great prices. Operating on "high," which it does a lot, I've never found it distracting loud. It doesn't overpower my music and I can have a conversation without yelling. (Although, the first time I turned it on I did joke that it sounds like an airplane is taking off in my garage. But it's a large fan)
PS
I did a quick look at Global's web site and in the FAQ it says... "58 decibels at its lowest setting." It didn't list decibels at medium or high - maybe you could give them a call.