Air Flow Switch Contact Form SPDT Input Voltage 115/230V AC Full Load Current 2 A Maximum Air Velocity 2 000 fpm Minimum Actuation Air Velocity - Vertical 750 fpm Minimum Actuation Air Velocity - Horizontal 500 fpm Maximum Duct Air Temperature 176 Degrees F Maximum Operating Temperature 104 Degrees F Minimum Operating Temperature 32 Degrees F Housing Material Polycarbonate NEMA Rating 3R Application Air Flow Sensing Exhaust Air Systems Make-up Air Paddle Width 3 1/8 in