Re: [Amps] LK 500 ZA heat

["Tom Rauch" <w8ji@contesting.com>]

> Steve is right. The turbulent air from the outlet of a fan 
> makes a huge
> difference to the cooling efficiency.


That's just one of many reasons.

Fans are noisier when the inlet is restricted.
Fans last longer when in cool air.
If filtered the high pressure side will keep dust out.

The list can go on and on.

The important point I wanted to make was when a fan is added 
to a system with an existing fan, the greatest boost occurs 
when the new fan is on the inlet. This assume of course the 
fan is properly sized and the second air mover is far enough 
away (a few inches normally) to not force turbulent air 
directly into the impeller of the original fan.

Fans always work better when the thing being cooled is near 
the fan outlet, and when you want to increase flow and 
pressure with a second  fan in series it is always 
significantly better to boost the original fan's inlet.

73 Tom






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