[AMPS] Emtron DX1

[measures]

>Rich says:
>
>>note -- High-pressure centrifugal blowers have relatively narrow, large 
>>diameter squirrel-cages that operate at c. 3400 rpm. 
>
>Unfortunately, they are also noisy. Quiet blowers producing lots of air flow
>have large wheels, go slowly, but don't necessarily work well under the back
>pressure requirements (I guess if it was big enough, it might be OK) - and 
>Rich
>has highlighted the fact that you will have a lot of back pressure. The 
>idea of
>a remote big blower is probably the best for quietness but it will need to be
>big to get over the losses in the duct work.
>
>Maybe amps with radiation cooled glass tubes and modest air flow requirements
>have advantages if you live at high altitude, although it's not something 
>that
>I've ever had to consider.
>
The SB-220 uses a heavily-loaded impedance-protected motor.  As altitude 
increases, the fan blade turns faster due to decreased air density.  I 
would have no qualms about using a SB-220 at 10,000 ft. altitude - 
provided the fan was oiled.  . 
>
>Peter G3RZP
>
>
>
>


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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