Safety is a big concern when operating large equipment like this that is why Bissell added in special safety features:

Despite its comprehensive air-cleaning ability

10 Speed Settings

Color/Finish: Black/green chrome

and there is a lifetime warranty on the reinforced fan

Bissell 21-inch Scrub Pad for Commercial Floor Machines SG21 Miele Irons & Presses Safety is a big concern[custom_html] The Bissell Commercial 21 Scrub Pad quickly removes surface dirt and deep scuff when use in combination with a cleaning solution. If properly maintained, the scrub pad will last for up to 25 uses. To maintain the Bissell Commercial 21 Scrub Pad it will need to be removed from the floor machine and be thoroughly washed. Do not place it back on the floor machine if not in use. Specification: MPN: SG21 Pad Width: 21 Color: Green [