Carbon Monoxide Duct Detector Kit, 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, Tube Length (Ft.) 4 1/2 ft, Width (In.) 2 1/4 in, Duct Width (Ft.) 1 to 6 ft, Ambient Temp. Limits (F) 32 Degrees to 158 Degrees F, Air Velocity (FPM) 100 to 4000 fpm, Amps AC 10 A, Humidity Range ( Percent RH) 10 to 85 Percent RH Non-Condensing/Non-Freezing