Damper, Product Type Damper, Compatible with Grainger Part Number 3C188, 3C189, 3C732, 3C733, Compatible with Manufacturer Model Number AMD/GMD 12 in, AMD/GMD 16 in, AMD/GMD 20 in, AMD/GMD 24 in, AMD/GMD 30 in, AMD/GMD 36 in, AMD/GMD 42 in, AMD/GMD 48 in, AMD/GMD 54 in, AMD/GMD 60 in, Nameplate Voltage 24 to 240V AC, Frequency 50/60 Hz, Compatible with Brand ACP Shutters