In many situations where easy and continuous access to parts of a machine is necessary, a
complete enclosure may not be possible, and a partial enclosure must be considered (Alfredson
& Seow, 1976). However, the noise reductions that can be expected at specific locations from
partial enclosures are difficult to estimate and will depend upon the particular geometry. An
example of a partial enclosure is shown in Figure 10.22. Estimates of the sound power
reduction to be expected from various degrees of partial enclosure are presented in Figure 10.23.