Also finger grills and panel slots create turbulence which can drastically
reduce flow. For a common or garden 'computer' type of fan, a dust filter
can practically stop air flow all together, so, choose with care.
David
G3UNA
----- Original Message -----
From: "Geoffrey Mackenzie-Kennedy" <[EMAIL PROTECTED]>
To: "Elecraft Discussion List" <[email protected]>
Sent: Thursday, December 07, 2006 1:05 PM
Subject: Re: RE: [Elecraft] Thermal control for Q1 / Q2 in KPA100?
David G3UNA wrote:
Consult the fan design and see how its rating varies with pressure on one
side or the other. The air flow rate drops dramatically from its
headline advertised value as soon as it encounters any back pressure in
front of it and with restriction on the inlet side.
-------------------------------------------------------------------------------------
The restriction on the inlet side that David mentions would include the
effect of any air filter. This might appear to be obvious, but it does
mean that the filter has has to be cleaned when necessary to maintain
proper air flow, a task often forgotten. I believe that air cooling
systems should include air filters whenever possible.
73,
Geoff
GM4ESD
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