Description Cardboard concertina filters are commonly used in wet paint spraybooths to capture overspray preventing it from entering the extract ventilation system. Cardboard Concertina Overspray Filter for Spray Booths Size: 9m x 900mm /720 The Cardboard Concertina Filter can be used in both wet and dry paint spray booths to remove excess over spray before it enters the extraction system. Maximum Recommended Face Velocity : 0.25 to 1m/s  Clean Pressure Drop : 55Pa at 1m/s  Recommended Max Pressure Drop: 128Pa