Description
The Simplex 4905-9931 is a TrueAlert adapter plate designed to mount compatible Simplex TrueAlert addressable and non-addressable wall-mount notification appliances to an existing Simplex 2975-9145 electrical box.
This adapter plate allows surface or semi-flush installation of supported 4901 Horn, 4903 Audible/Visible, and 4904 Strobe appliances. The plate supports both vertical and horizontal mounting orientations and can be rotated to meet installation requirements.
The 4905-9931 simplifies retrofit projects by adapting legacy 2975-9145 backboxes to accept TrueAlert notification devices without replacing the existing box. It is not intended for humid-application installations.

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