The Sterilizair is our brand new HEPA air filtration device that is outperforming the competition by up to 30%. The Sterilizair is patented in the way that it filters the air. It takes in the air from the top of the unit and disperses it throughout all 4 sides of the machine. The louvers on the bottom of the unit can be positioned however the owner likes to maximize efficiency. Each exhaust can be lay-flat ducted in order to create negative pressure and can also be blocked off the same way. In filtering the air from top to bottom and placing the AFD in the middle of the room it eliminates the stratification of air which lowers the particulates lower and faster than its competitors. The unit comes with a HEPA and pre-filter installed but has the optional charcoal filter to be able to be used with it as well.