am (Gary V. Deutschmann, Sr.) writes:

Hi Ross

I won't argue with your logic as it is quite feasible!

But on the other side of the coin, I have two square muffin fans, like
found in power supplies, both had run for almost 10 years with no
problem pulling air not pushing it from the lighting on my reef
aquarium. Yes they have both changed from black to white over the
years as salt built up on them, but at $7.00 each back then, probably
$9 to $14 today, my cost of replacements has been nil.

I suppose that it would depend on the design of the actual fan
in question.

I appear to have bad luck in that department, but found that only
using intake fans seemed to cause no reduction of ventilation and
a substantially smaller pile of ruined fans.

Regards,
Ross

-- Ross Bagley http://rossbagley.com/rba
"Security is mostly a superstition. It does not exist in nature...
Life is either a daring adventure or nothing." -- Helen Keller