This really clears well. I whipped it up when I was busy and really should have reduced the fan some as it would have saved some heat. I painted some big dump trucks, semi tractor in it and it really worked well. I am glad I didn't build something more dedicated etc, my paint goes in spurts and I use the space for winter parking mostly as there is floor drain in that part of the shop. The downdraft whooshes any dirt right out, I don't even really fuss over sweeping for paint. Having a long booth is good, I painted out a tractor and move stuff in behind the next day to paint, overspray on the intake end not a problem.
I simply duct taped the top of the long sheet to the roof purlin, had a little come loose about 10 yrs in, taped it again and is still fine.
A couple of these I painted the whole tractor parts and all in one shot. Booth is about 39 ft long and 15=16 ft wide.