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The Simplex 4006 is a 5 zone, 2 NAC conventional fire alarm control panel. It is expandable to 10 zones and 4 NACs. There are several different models of 4006, with small differences. The 4006 was introduced in 2005, and is still being produced today.
Different variations
4006-9101: Red door.
4006-9102: Beige door.
4006-9121: Red door, 24 LED annunciator built into cabinet.
4006-9122: Beige door, 24 LED annunciator built into cabinet.