NH Series

Unusually Quiet

Type NH fans, with their stable and efficient performance, are quiet in operation. In fact, quietness is one of the principal features of the Type NH design.

It should be emphasized that maximum quietness in actual operation depends not only on the choice of the fan itself, but also the system of which the fan is a part. Poorly designed ductwork of too light construction or with abrupt turns, as weel as improper fan foundations, lack of proper isolation between fan and ducts, and poor acoustical conditions adversely affect the sound level of the installation.

A guide for selection of fan outlet velocities at various static pressures is shown in the table on the right. In general, choosing a lower outlet velocity for the static pressure involved results in quiter operation.