Bill Smith wrote:
> Do the muffin fans hold up ok with all the hot air
> being pulled through them? I use one to enhance the
> exhaust from two 3-400Z tubes.
> 73,
> Bill
>
As someone else has said, fans work better when pushing air, rather than
pulling it. Assuming a local air pressure of 760 mm of mercury, the
greatest pressure drop a fan can possibly produce when sucking is 760 mm
of Hg - the negative vacuum does not exist to my knowledge. In contrast,
when pushing air, there is no theoretical limit - ignoring the possibly
of liquefying the air.
The above argument does not prove fans work better at more typical
pressures, but I believe this is the case.
Like any component, fans last longer when cool.
--
Dr. David Kirkby,
Senior Research Fellow,
Department of Medical Physics,
University College London,
11-20 Capper St, London, WC1E 6JA.
Tel: 020 7767 6409 Fax: 020 7769 6269
e-mail davek@medphys.ucl.ac.uk
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