OWNER’S MANUAL AAS800 AIR SCRUBBER
Page 7
MAINTENANCE
WARNING
Use extreme caution when changing the HEPA lter as hazardous material could be trapped in the media.
Always make sure to dispose of lters in the appropriate way. If you are unsure of how to safely dispose of
any lter-consult an industrial hygienist to ensure that all hazardous materials are contained and disposed
of properly.
Air Filters
The standard Air Scrubber HEPA System is equipped with two lters that progressively lter out smaller particles. An
optional activated carbon/potassium permanganate lter can be also added. These lters must be checked regularly.
Operating the unit with dirty lters will reduce the airow, but will do no harm to the unit. The unit can be run indenitely
with dirty lters. The two standard lters used are listed below (as installed in the unit from top to bottom):
A. 25 to 30% ecient (per ASHRAE 52.1-1992), MERV-7, pleated fabric pre-lter.
B. 99.97% DOP ecient HEPA lter.
Filter replacement
When the amber “lter change light” illuminates. It may be time to replace one or both lters.
To check airow accurately, an airow meter or anemometer must be used:
When the lter change light illuminates; remove all ducting and run on high speed. if the lter light remains lit;
replace the pre-lter and run on high again. If the light remains; it is time to replace the HEPA lter for full 500 CFM
performance.
Airow on high speed with all lters clean and no ducting is slightly over 500 CFM. The unit can be run with very dirty
lters and virtually no ow without harming the unit. The operator’s decision to change lters should be based on lter
cost vs. the unit’s ltering eectiveness. If airow is 250 CFM vs. 500 CFM, the unit will lter particles from a space at
half the rate. The operator must judge if that is acceptable. If the operator determines the lters should be changed
due to low airow, it is most economical to change them in the following order:
Change the pre-lter (top) rst. This is the least expensive lter. Recheck the airow. If the airow is acceptable, no
other lters need to be changed. If the airow is still too low, the HEPA lter must be changed. To remove the HEPA
lter, follow these steps:
1. Loosen the eight screws one revolution
2. Rotate all eight clips out of the way.
3. Remove old lter.
4. Installing the new lter is the reverse of these instructions
