[Stonius (Markus)]

Just received some brushless fans in the post. I was planning to use them to clear the boundary layer in my dob using a suspended wire mount in front of the mirror, but I can feel the vibrations when it is running and I worry that they might transfer those vibrations to the telescope and ruin high power views.

I figure not all fans are created equal, but I wonder how you even find them. 'noise' in the specs I think refers to electrical noise, I believe.

Cheers

Markus