The Dwyer Instruments 1911-20-WP Combustion Air Pressure Switch detects combustion air pressure and provides a switch output in response to pressure changes. It is used with fuel-burning equipment, such as furnaces and boilers, to monitor air supply and help ensure proper burner operation. The 1911-20-WP is part of Dwyer Instruments' line of combustion air switches and is installed in the combustion air path to relay pressure status to the connected control system.
