Mount on return duct for backup control. Overview Mount on return duct for backup control of non-zoned RedLINK� enabled Wireless Systems and Thermostats. Features Works with THM5320R1000 Equipment Interface Module to maintain safe indoor temperatures if power is lost at the wireless thermostat Takes control of the equipment by turning on the blower fan and sensing the indoor temperature of the home Controls heating at 62 F and cooling at 82 F Provides homeowners with peace of mind Installs in minutes Includes mounting hardware Product Specifications Application Mount on return duct for backup control of non-zoned systems Dimensions (in.) 3 7/8 in. high x 4 1/8 in. wide x 1 1/4 in. deep Dimensions (mm) 77 mm high x 102 mm wide x 25 mm deep. Sensor probe is 3 3/4 in. long (77 mm) Used With THM5320R1000 Equipment Interface Module; TH6320R1004 or TH5320R1002 Wireless FocusPRO� Thermostat Comments Return Air Sensor is also available in kits for non-zoned systems Mounting Mounts on return duct Operating Temperature Range (F) 0 F to 200 F Operating Temperature Range (C) -17.8 C to 93.3 C Color Gray