Duct Smoke Detector, Photoelectric, Finish Plastic, Duct Mounting, Alarm Current 18mA @ 230V AC, 190mA @ 24V AC, 32mA @ 115V AC, 68mA @ 24V DC, Depth (In.) 2 1/4 in, Height (In.) 4 1/2 in, Length (In.) 13 1/2 in, Width (In.) 2 1/4 in, Ambient Temp. Limits (F) 32 to 140 Degrees , Air Velocity (FPM) 100 to 4000, Amps AC 10, Humidity Range ( Percent RH) 10 to 85 Non-Condensing/ Non-Freezing, Voltage 115V AC, 230V AC, 24V AC, 24V DC, Standards CSFM, cUL, ETL, ETL-Can, MEA, UL