AQS/3

the AQS/3 has 8 fans total (see below).
to service:
UNPLUG power supply
1. the AQS/3 has a tray which slides out for easy service (see service manual below)
2. remove 4 small screws in the back
3. remove 6 small screw on AQS/3 power face plate and pull gently.
4. the plate with its power supply will pull out and can dangle off to the side.
5. pull the tray out from the front.

service_manual - service manual can be found here.

original_fan - original AQS/3 fans - FD121225MG (12Vdc, 0.29A, 3.5W, 88CFM, 119x119x38mm, 3 wire) Y.S. Tech, need 8

aqs/3_fan_replacement - AQS/3 fan replacement, NMB, 11925SA-12N-AL-00 , 119x119x25mm, 12Vdc, 4.5W, 0.38A, 91CFM, 3 wire ($14/each)

AQS3