Lennox 14T66 Pressure Switch

The Lennox 14T66 is a Combustion Air Pressure Switch Kit, an essential part of your downflow gas furnace. This is specifically helpful in that it performs the duty of a safety guard by measuring the air pressure that gets into the combustion chamber. That way, air circulation is enabled where it is safe to burn fuel and the butterfly is used to maintain the required flow. If the pressure drops down to a dangerous level at 0.25 WC, the switch stops the supply of gas to avoid mishaps and risks.