Tempest LIZA - Manual (Page 11)

LIZA Enclosure User Manual page 11
3.3 LIZA Operation
The LIZA Fan Controller monitors current going to the projector inside the LIZA enclosure, and also heat inside the
enclosure. When it detects that the projector is on and/or the internal temperature is getting warm, LIZA starts to
run its fan(s), increasing speed as power and/or heat increases, and reducing fan speed (and therefore noise)
whenever possible with a safe margin of error.
LIZA Operation is completely automatic.