Air handlers and gas furnaces use a fan relay to switch the blower motor ON and OFF. The fan circulates the cold or warm air inside the home. Most furnaces and air handlers use a two-speed motor, a high speed for cooling and a lower speed for heating. So, if you are looking to buy one for your HVAC system, check out the impressive collection of fan relays at DK Hardware. The Emerson Fan Control Center has an energy limiting class II transformer design and low voltage connections on the terminal board. It features pre-wired line voltage connections and color-coded and pre-stripped leads for easy installation. The Packard Plenum Thermostat Open is innovatively designed and works remarkably well. It opens at 250F and closes at 210F. You can also check out some more register boxes on this page and choose the one that best suits your need.
