1. What dimensions would you use for a booth-type hood if you wanted an exhaust rate of 1,000 cubic feet per minute and a capture rate of 100 feet per minute to capture organic vapors from a paint spray operation? Be sure to show your work. If you wanted to clean the air that you are capturing before exhausting it outside, what type of air cleaning device would you recommend and why

For an emission source of  one duct diameter and having duct velocity of  1,000 feet per minute we find that the expected capture velocity (Vc) to be 100 fpm. 

For the case of 2- duct diameter the story is different where the capture velocity decreases by a factor of 10, to 10 fpm. But rate velocity x area

Duct diameters: this is obtain through calculation of areas...