Metrohm 921 NIRS Vial Heater - Manual (Page 14)

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5.3 Fan filter maintenance
Inspect the fan filter at least once per month. It must be kept clean for the unit to operate properly. If
dirty, remove AC power and follow these steps:
1. To open the fan filter, grasp the outer black
cover and gently pull it away from the module.
The filter material is inside the cover.
2. Remove the filter material and blow it clean
with laboratory compressed air.
3. Reinstall the filter material in the cover and
snap it back on to the fan housing. Apply AC
power to resume normal operation.