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