To all the people that bought Guan Sheng sourced Newtonians (Andrews, Bintel etc) that didn't have a fan, there is an easy solution.
A friend purchased an Andrews GSO dob without a fan, now we all know the importance of a fan to help reduce the mirrors temp to as close to ambient as possible.
I spoke to Don at Bintel and he informed me that they recently recieved a large box of fans with lead and socket + the battery pack (8x AA's) from GS
All for $20 + Del.
He still has quite a few left.
P.S. These fit right over the screw holes in the mirror cell.