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9. Replace the front access cover. Secure the service door by inserting the service key into
each lock, pressing in against the spring, then turning the key 90°.
10. Clean the exterior of the unit using a spray disinfectant and a soft cloth.
11. Plug the unit back in.
12. Test the unit's operation as follows: Turn the unit on by inserting the operator's key into the
key switch and turning it to LOW. Run at LOW for 60 seconds, then at HIGH for 60
seconds. Listen for smooth operation and check for free airflow from the clean air discharge
grille at the top.
13. Dispose of the old pre-filter properly (as contaminated waste, for example), observing all
pertinent disposal protocols and procedures.
14. Record the completion of these procedures.
