[Drake] Cooling fans - blow in or out?

[Duane B. Fischer, W8DBF]

I have the post in question on file. This is correct. This is why a fan is
placed in the window frame in a house with the blades pulling the air from the
house and blowing the air outside. A window open elsewhere in the house will
have aire drawn through it from the outside by this action. The result is far
better cooling than blowing the air from outside into the house where the hot
air is trapped.			
	
The better the circulation, the better the heating or cooling.	
	
 


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From: KB9GKC at aol.com
To: Drake at mailman.qth.net
Subject: Re: [Drake] Cooling fans - blow in or out?
Date: Sunday, February 13, 2005 10:54 AM

Hello Gentlemen,
 
This was hashed over about 4 years ago (have a look in the archives).   The 
result was that someone in the group took a scientific approach and actually  
measured the temperature inside the PAs cage.  I remember very clearly the  
results.  The temperature inside the cage was dramatically reduced by  drawing 
the air out rather than in, the hypothesis was that the fact that  drawing the 
air through the small cage holes was more effective then trying to  blow air in 
and the air becoming turbulent when it missed the holes and ran into  the 
metal and bounced back towards the fan.
 
So blow the air out and away.
 
73 and keep those tubes lit.
Douglas
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