Simplex 4904-9178 Visible Notification Appliance Wall-Mount SF 22/01 and is used to indicate

and is used to indicate a fault condition

which can support 159 SK detectors and 159 SK modules

without overloading the main panel

They fit into a standard 4‐inch square or double‐gang electrical back box

Detector Tester Calibration Kit

Simplex 4904-9178 Visible Notification Appliance Wall-Mount SF 22/01 and is used to indicateSimplex 4904 Series wall mount visible notification appliances provide symmetrical light output in key axis directions by utilizing a compound, multi surface reflector. The lens assembly fits securely into its housing, providing a high integrity notification appliance that is impact and vandal resistant and suitable for a variety of applications.