Re: ATM Long focal length advice required please,

["Bob May" <bobmay@nethere.com>]

Also, the addition of a filter between the fan and the scope will remove any
rotating of the air as it goes across the primary.  Deflectors to spread the
air is also a good idea as otherwise the air will just cool one corner to
the other side where it is a lot more spread out.
I'll also note that the big low volume fans make for good blowers.  You
don't need a gale in there but just a bit of flow.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net