The S-4 which is produced in series, is a very compact mobile suction unit. Its convincing suction performance makes it possible to convey suction material at considerable conveying rates over long distances with diameter 80 or 100 flexible hoses. The high-tech filter system with three serial separation steps and pneumatic AirShock® filter cleaning device guarantees a continuously high suction power even for difficult types of dust. The collection container is lifted hydraulically in its working position and discharges the suction material into BigBags or open containers. Special versions with explosion protection according to Atex and with nitrogen cooler for catalyst handling are available. S-4, the compact unit with extremely high suction power manufactured in series production quality.