I played at an American Legion in Havre de Grace, MD for six years that had a pair of them--they were worthless. The cost was about $3000 apiece, the place was about 2000 square feet in size, and there were times when I came in to set up that you would have throught the building was on fire because of all the smoke coming out thte doors.

The eventually put in a large exhaust fan that did a much better job of smoke removal, but nothing short of a smoking ban solves the problem.

Gary