I can't see an easy way to remove and clean the air filters in a Lasko 5566 tower ceramic heater, without taking the entire unit apart. There are no "doors", hinges, slots, etc. The filters are right behind a plastic faceplate which runs the height of the tall unit, and which appears to be permanently attached. Any ideas how I can access these filters? Or must I dis-assemble the entire unit?

Heating & Cooling - Lasko - 5520 Ceramic Compact Heater