The Atem will indicate a necessary filter change with a double red flash accompanied by a sound.
Disconnect the Atem from the power source before changing the filter!
Step 1: Remove the air purifier from the stand and place it face down on a cloth surface with the back facing up.
Step 2: On the back cover, note the direction indicators on the locking ring. Grasp the locking ring firmly and rotate in a counter-clockwise direction until the back cover releases. You should be able to easily lift the back away.
Step 3: Remove the old filter by pulling on the tabs and then dispose of it. Replace with a new IQAir Atem HyperHEPA® filter and firmly press into place.
Step 4: Put the back cover on and gently rotate until the lock pins align into place. Grasp firmly and press down on the locking ring and turn clockwise to lock. The back cover should now be closed securely. Attach the air purifier to the stand for use.