Andreae 813 Concertina Extract Filter 0.9m x 9.14mThe universal industrial spraybooth filter, supplied in 0. 9m x 9. 14m lengths. Andreae concertina perforated cardboard paint filters provide lower air flow resistance to maintain high airflow. With a high holding capcity these usually last many times longer than fibreglass filters. Commonly used in spray booths these will capture a wide range of wet particles including any wet solids or liquid particles including high solid paints, oils, stains,