The Honeywell Resideo 91435 Fan and Limit Combo Controller is a 5" insert designed for central furnace compatibility. With a blade length of 4 inches and a wattage of 50 watts, this corded electric controller features 3 power levels and a brushed finish. Manufactured in Mexico by Honeywell, this portable fan and limit controller is ideal for HVAC and refrigeration systems, offering a reliable and efficient control solution for heating and cooling systems.