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Re: quick question on a fan and spray booth.
Ensure that your reducer is no less than 12 inches long and this should prevent undo amounts of backpressure.
Is your 4 inch line flex duct. Long runs of flex duct can build up a great deal of friction in the airflow, enough friction to overwhelm the power of a 10 inch fan. Also make sure that any bends in your 4 inch line is no tighter than the duct width. Make an 8 inch diameter circle out of cardboard and place this on the inside of any bends in your 4 inch line. If it does not fit then the bend is too tight creating more backpressure.
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