How To Replace Air Scrubber Filters

Taken from the user manual (Abatement Technologies, Pred750, page 11-12)

How to change pre-filter

1. 
   With the unit operating, turn the two latches on the pre-filter access door counterclockwise (approx ½ turn), swing the latches outward, and open the door. Remove the first-stage filter located inside the door itself and replace it with a new one.
2. Close the door and lock it in position by swinging the latches inward and turning the latch clockwise. Make sure the door is flush against the unit’s cabinet before closing the latch
3. If the Filter Change Indicator light remains “ON” after changing the first-stage filter, the second- stage filter should be replaced

How to change second-stage filter

1. Open the pre-filter access door by turning the two latches counterclockwise (approximately 1 /2 turn), swing the latches outward, and open the door.
2. Remove the second-stage pleated filter and replace it with a new one. The pleats on the air filter should be oriented so that they are vertical and the air flow directional arrow on the filter should point toward the control panel. 11 Note: If an alternate VAPOR-LOCK® filter is being used, be sure to remove it from its poly bag before installing it in the unit. VAPOR-LOCK® filters are packaged in poly bags to preserve the integrity of the carbon granules.
3. Close the door and lock it in position by swinging the latches inward and turning the latch clockwise. Make sure the door is flush against the unit’s cabinet before closing the latch.
4. If the Filter Change Indicator light remains “ON” after changing the second-stage filter, the HEPA filter should be replaced.

How to change HEPA filter

1. Turn the unit “OFF” and disconnect the unit’s power cord from the electrical outlet.
2. Open the pre-filter access door by turning the two latches counterclockwise (approximately 1 /2 turn), swing the latches outward, and open the door.
3. Remove the second-stage pleated filter. The HEPA filter is located behind the pleated pre-filter.
4. The HEPA filter is held into place by two metal brackets. Remove the two screws from each bracket and then remove the HEPA filter from the machine.
5. Insert the new HEPA filter with the pleats oriented vertically and the air flow directional arrow on the filter pointing towards the control panel (the gasketed side of the HEPA filter will be against the internal wall). Note: The HEPA filter is delicate and should be handled with care. When removing or reattaching the HEPA filter retaining brackets, do not touch the filter media; otherwise, damage to the filter and leakage of contaminated air could result.
6. Replace the two metal brackets and secure the brackets with the screws. Important: Do not use a power screw driver or drill to tighten the screws down as this may strip the screw head; tighten with a manual screw driver only.
7. Insert the second-stage pleated filter into the machine. The pleats on the air filter should be oriented so that they are vertical and the air flow directional arrow on the filter should point toward the control panel.
8. Close the door and lock it in position by swinging the latches inward and turning the latch clockwise. Make sure the door is flush against the unit’s cabinet before closing the latch. Note: The HEPA filter is not designed to be cleaned and using methods such as compressed air in an attempt to clean the filter can cause damage to the filter and comprise the HEPA filter efficiency rating.

The user manual can be found on manualslib.com.