Nilfisk AERO 21 Wet & Dry Vacuum CleanerNilfisk AERO 21 Wet & Dry Vacuum Cleaner is a compact vac cleaner with filter cleaning and simple features The AERO 21 is the smallest model in the AERO Wet & Dry vac series with compact design and easy to use features such as Push&Clean filter cleaning system and convenient accessory storage. The 20 litre machine has efficient suction performance, robust trolley and lifting handle. The AERO 21 is a lightweight machine for workers within industry,