3M clean walk framed mat 5840 is used in removing dirt and other contaminates from the bottom of shoes, wheels or any passing objects. Removal of particulate prevents contamination in sensitive operations such as clean room or paint area. Reduces maintenance and replacement costs due to premature wear of flooring surfaces. Movable frame allows for positioning on carpets and other surfaces. Portability is an important feature if used in static sensitive areas because them at can be removed from the area to isolate static charge that may be occur when sheets are removed.