The HEPA, activated carbon, and zeolite are combined into one large cartridge witch weighs about 19 pounds. Natural zeolite is mined from the earth. It is a cream-colored mineral. Zeolite has exceptional abilities for capturing small molecules such as ammonia, formaldehyde, and sulfides. Under normal circumstances, the Austin Air Cleaner filter is guaranteed for five years.
Air flow becomes restricted through the clean air exhaust outlet.
It's very simple. Just turn the unit upside down and remove the four retaining screws holding the bottom on. Lift off the bottom panel and lift out the old filter cartridge. Replace it with the new filter and screw the bottom panel back on. The entire body of the Austin Air Cleaner is solid steel, which has been welded together to prevent any rattle caused by motor vibration.