Locate the tabs on either side of the purifier. Insert your fingers into the tabs and pull the front grill off of the device.
Insert the HEPA filter into the filter opening on the front of the device. Apply pressure to each corner of the filter to ensure that it is properly seated.
Examine the back side of the front grill and confirm that the pre-filter is covering all the vents. Replace the front grill onto the device; insert the bottom of the grill first, then push the top into place.
Plug the air purifier into an electrical outlet and press the button labeled with an arrow pointing up (located on top of the device).
Use the arrow buttons to adjust the device's blower to the desired speed.