Lennox 59W40 Blower Proving Switch -0.15"

The Lennox 59W40 Blower Proving Switch is an essential safety device of your HVAC system. It serves as a pressure switch to guarantee the proper functioning of the blower motor, safely. When the furnace or air handler is on, The blower fan forces air using ductwork in the home. This airflow causes the switch to turn on and tell the system that it is okay to turn the burners on in a furnace or to continue with the cool air circulation. the Lennox 59W40 works with a range of Lennox HVAC equipment.