I purchased this to create negative pressure in my spray shop 16‘ x 16‘ with 8’ ceilings.I have a 3” x 30” rectangular air inlet cut into the door and this 12 inch outlet on the other side of the room blowing to outside. Very easy to pull the fan out the door turn on no officers or the cabinet shop have any odor of the lockers that we’re spraying when the fan is on seems to do a phenomenal job pulling out the proper amount of CFM’s to keep the shop clean and from dust settling on the paint and all owners are dischargedStebI have a 3“ x 30“ rectangle or air inlet cut into the door and this 12 inch outlet on the other side of the room blowing outside. Very easy to pull the fan out the door turn on no offices or the cabinet shop have any other of the lockers that were spraying when this fan is on seem to do a phenomenal job pulling out the proper manner CFM‘s to keep the shop clean and from dust selling on the paint and all owners are dischargedSteve WrightSouthwest PA