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Originally Posted by bobkoure
I think there may be some easy/cheap things that could be done.
For instance, much of the annoying noise is higher frequencies. A simple 1" of sound absorbent foam can attenuate frequencies down to 7KHz or so (trick is to have air friction a half wavelength away from a reflecting surface). So... if you're set up in the "typical" pull style, put a baffle over the rad opening, spaced, say, so there's a 1" space between the foam and the rad - and put a 1" foam panel on the baffle. Higher frequencies are pretty "beamy" and won't go around the baffle - and you're attenuating whatever might reflect out.
Marci says that a good portion of the noise is generated by air passing through a radiator. At low air velocity, I'm not sure this is true - and if most of the noise is from the fan(s), then maybe just putting the fan at right angles to the radiator fins may provide a good deal of attenuation.
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Thanks for a interesting idea.
I expect to have to do some tuning of any such case I make. Your baffle directly inline with the opening of the core is a differant approach to what I've had in mind. I see your point in attenuation of the noise's pitch. Proper spacing for a balance of free enough air flow while still able to cut down the pitch of the noise would be the trick. Thank's agian.