Your booth will be 12.25 cu ft, so a 125 CFM blower, will evacuate the entire contents of the booth a little over 10 times every minute, and I'd think that would be more than adequate. My own booth, at 18 cu ft, and with two blowers running in tandem, drawing a combined 424 CFM at a guesstimated 0.300-in SP (static pressure), will evacuate all air volume of paint booth 23.55 times per minute.