The rear cooling fan on my new ASA N12 Newtonian astrograph is wired such that it is sucking the air out of the tube rather than blowing it onto the back of the mirror.
It is a closed tube and there is hardly any room around the mirror and mirror cell and the fan is mounted in a carbon fiber plate that fills the entire rear of the tube:
http://www.pbase.com/strongmanmike20...72520276/large
I am not sure if it would be better to turn the fan around and have air blowing on to the back of the mirror or leave it as it is with the air being sucked out?
Any opinions?
Cheers
Mike