Yep i want to test the system on a night of good seeing. The reason Im trying pulling air from inside the scope is that the AAT used to blow air in from outside through a filter room, air from inside the dome exhausting out through the dome slit over the telescope. Then I heard that by reversing the fans and drawing air in from outside, clean air free of turbulence washes over the telescope. They do, however have separate fans blowing air over the surface of the mirror too I believe. Its mentioned at bottom of here
http://www.aao.gov.au/local/www/cgt/...00000000000000
Also this
Quote:
"The dome is a steel structure, vented and insulated to reduce heating of the inside air during the day. An up-and-over shutter gives access to the sky and protection from wind gusts is provided by a rigid windscreen which allows the telescope to observe through a (6.5m x 5.3m) opening. This opening is automatically aligned with the telescope tube when observing under computer control.
The space between the outer steel skin of the dome and the inner insulated skin can be ventilated by fans. The same fans and their associated louvres can be switched to exhaust the dome air and replace it with air entering either through the open viewing aperture or injected by large ventilation fans on the second floor. These fans will be switched on by the night assistant when needed.
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