Reply To: Suck or blow

Forums Telescopes Suck or blow Reply To: Suck or blow

Peter Carson

Hi Grant,
My Planewave 315mm CDK has forced tube ventilation that sucks air down the tube past the secondary, primary, and out the back of the primary mirror cell.
I’ve noticed that all ASA reflectors have a fan that blows air into the side of the tube just above the surface of the primary. I understand this is to reduce or eliminate condensation as they don’t have any form of mirror heating.