Mike Scott wrote:
Is the possible entry of water a problem? I've always though that the gap
between the impeller and the frame should be on the bottom so that water
could not fill the airspace in the fan motor.
If the mounting location is such that it may get wet, then you really
should be using a fan with fully enclosed motor -- not one intended for
dry indoor use. Especially on a fan, water is going to get into
*everything*, no matter how you mount it.
Dach Savage <[email protected]> wrote:
In most any ventilation or cooling scheme it is best to use the fan in an
exhaust mode, IE pulling the air out of a cabinet.
You really have to look at the blade design. The manufacturers have
performance curves, showing air flow versus air pressure. Propeller fans
are very sensitive to air pressure, and the pressure difference between
inlet and outlet. Some blade designs will have a drastic reduction in
airflow with even a slight restriction or reduced air pressure at their
inlet. Others can tolerate it much better.
The fans I've happened to use in product designs have generally worked
better by pressurize the cabinet. It extracts a bit more heat (the
things being cooled run a bit cooler), and it makes sure that any air
leaks will let air out, rather than suck in air (or dirt or water or
bugs etc.) from uncontrolled cracks or openings.
--
The greatest pleasure in life is to create something that wasn't there
before. -- Roy Spence
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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