RCS WHISPAIR units reduce noise and power loss by utilizing a wrap-around plenum and proprietary WHISPAIR jet ports to control pressure equalization. The WHISPAIR jets meter discharge pressure in the direction of impeller movement, thereby aiding rotation. Discharge pulsation is reduced by the pre-pressurization of the Blower chamber. This reduced pulsation results in lower noise, and reduced shock loading on the system components. RCS WHISPAIR units frames 817J thru 832J have feet integral to the headplates.
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