3M - A121

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Contents

Noise Reduction Module Model A121 Installation Instructions Description The 3M Noise Reduction Module 3M part number 78 9236 6403 7 improves the inbound intelligibility of an intercom system by reducing environmental background noise from vehicles airplanes noisy intersections etc Additional Material Required 18 22 AWG twisted shielded pair audio wire 2 mounting screws and appropriate wall anchors Important The 3M Noise Reduction Module should be mounted no more than 3 feet from the intercom or base station System Requirements The 3M Noise Reduction Module requires a system with a separate outside microphone and speaker The A121 will not function with an intercom system configured to use a single speaker as both the microphone and speaker T ...