[Drake] Cooling fans - blow in or out?

[Garey Barrell]

Chris -

For a piece of equipment that is NOT  _designed_  to be forced air 
cooled, the most effective cooling is done by having the fan blow OUT, 
or better still UP to  _aid_  in getting warm air away from the 
immediate area.  A fan mounted on the back of the final cage of a Drake 
transmitter will keep it cool, and greatly extend the life of the final 
tubes and associated components.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>



Chris Codella, W2PA wrote:

> I'm about to install a cooling fan on my T-4XB and TR-4, having seen 
> many ways to do it.  But what's the concensus on the list about 
> blow-in vs. blow-out?  I've seen it recommended both ways.
>
> The only recommendation I saw that also included a rationale was one 
> posting where someone said to orient the fan blowing out because the 
> only time one wants to blow in is if there is a forced-air handling 
> design built in, as exists in many amplifiers (i.e. chimneys, etc.).  
> I must say that most rigs I see with factory mounted fans on the back 
> that also don't have air handling features inside, do in fact blow 
> out, not in.
>
> What's the concensus among the Drake crowd here?  Please don't 
> recommend one way or the other without giving a reason.
>
> Thanks!
> 73, Chris, W2PA
>
>