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The fi lter assembly will only release if the button is pushed. 3. Remove the pre-fi lter (see “cleaning the prefi lter”), and set aside. to clean the IFD™ fi lter 1. DO NOT USE WATER OR OTHER LIQUIDS TO CLEAN THE IFD FILTER. 2. After removing the IFD Filter assembly from the air purifi er, gently tap the fi lter onto a fi rm surface within a trash receptacle to release the captured particles. Should the IFD fi lter(s) dislodge from the frame, just place back in gently. NOTE 3. To clean the fi l