>>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)
I'm building amps for 2 and 6 using a 4CX800. I bought a blower
from Grainger, # 4C006 that runs at 2200 RPM and shows ratings
of 82 CFM at 1 in. pressure and 42 CFM at 1.2 in. pressure. I've
tried it and it is really quiet. The next step is to stick a
manometer near the tube and see what it's really doing. If it
works, this may be a good blower choice for amps using this size
tube. I'll post the figures when I get them.
Frank
W2FCA
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