This is a medium to large workshop filter unit which has the advantage that it can be positioned anywhere in the workshop, either on a bench, a shelf or suspended from the ceiling. The unit is easy to operate and has three speeds simply activated by the push of a button or by using the convenient remote control. It should be mounted away from ventilation and heating vents and is only suitable for non-metallic dust particles. The unit can be positioned either vertically or horizontally to best utilise the space available. It is fitted with a pleated cloth main filter and an electrostatically charged pre-filter. An optional charcoal filter is available which can (a) neutralise odours and harmful organic fumes and (b) refresh the air by removing smoke, dust, bacteria, pollen and other harmful microscopic particles. Supplied as standard with main filter and electrostatically charged pre-filter. For best results leave the AFS-500 running for a few minutes to clean the air after your machines have been switched off, or use the built in 2,4 or 8 hour timer options to run the filter after you leave the workshop.