Noise control is basically controlling the noise
emissions of an equipment item. This can be done by
choosing a quiet noise source(s) for the equipment
making up the noise producers of the overall equipment
within the equipment assembly, such as choosing quiet
fans or pumps, via containment or blocking of the
noise emission, absorption of the noise, use of equipment
such as mufflers or silencers to lower the noise,
or by design features that will otherwise reduce the
noise.
