The extremely quiet T 15/1 dry vacuum cleaner has a big 15 litre container for long periods of uninterrupted operation in contract cleaning. The accessory stowage facilities on the unit also comply with the professional criteria required for the target group: the suction hose can be locked in position and the floor tool can be parked in two different positions. The rugged housing protects machine components from knocks. Suction power is adjustable directly on the rotary controller with its sophisticated aperture geometry without any noticeable increase in noise level.