MAKE SURE THE UNIT IS TURNED OFF AND DISCONNECTED FROM THE POWER PLUG BEFORE CLEANING

Clean your Pre-filter by following the steps below (typically between 2-4 weeks depending on usage / when PRE LED light appears):
Open the back cover and gently pull it.
Press down on the side clips of the pre-filter to remove it.

Carefully wash with water or vacuum the pre-filter as needed.

MAKE SURE THE PRE-FILTER IS COMPLETELY DRY BEFORE INSTALLATION

Once clean, dry and ready for installation then gently put the pre-filter back into its designated slot and attach the back cover.