[Elecraft] Thermal control for Q1 / Q2 in KPA100?

[Geoffrey Mackenzie-Kennedy]

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.

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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