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I need fencing type/material to use to block low hum of pool pump located 12’ to 15’ from family room hurricane impact windows. I'm planning to erecta 6’ high fence on property line between houses spanning about 18’. The pump is used on high and low speed creating noise.

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    A fence isn't going to block low-frequency noise. You need to work with your neighbor (rather than insulting them) to isolate the pump from the ground. – isherwood Sep 9 '20 at 12:54
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You'd need a fence at least as high as the wavelength, with substantial mass, and for a 60 Hz hum, for example, that's a 5 meter (15 ft) high fence, made of concrete, such as used for highway sound barriers.

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    Probably cheaper to offer to pay for a soundproof enclosure for his pump. – JRaef Apr 8 '20 at 22:56
  • Yea 15 feet would be to high. Since there are schrubs around pump/motor platform I would need a box like enclosure over pump alone but overhead piping makes it difficult to design and create. Any suggestions? – user115579 Apr 11 '20 at 14:44
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    @JRaef A soundproof enclosure isn't going to fix low frequency resonance, it will go right through that enclosure like a house of cards. Vibration isolation and dampening is the only answer. – mchid Mar 10 at 15:09
  • As @JRaef states, vibrations will go through the ground. Commercial pumps are usually set on spring/rubber vibration absorbers, as well as enclosed. – DrMoishe Pippik Mar 10 at 17:58

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