This OEM 5RV heater circuit board is designed to replace the original equipment in gas furnaces. It controls the ignition and operation of the furnace burner. The circuit board monitors flame presence and automatically shuts off gas flow if the flame signal is lost. It also regulates the blower motor speed to maintain consistent indoor air temperature. This replacement board is manufactured to meet or exceed the specifications of the original part. It plugs directly into the existing wiring harness for an easy do-it-yourself installation. Homeowners will appreciate restoring full functionality to their furnace without the high cost of a service call. Measurements are 4 x 3 x 1 inches.