While it is a 12-inch diameter blade

A functioning unit should consistently read between 25 and 35 mV when the hot junction is fully enveloped by the pilot flame

Key Benefits Multi-Voltage Compatibility: Supports a broad range from 120V to 240V

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Armstrong Furnace R47583-001 Control Board Freon While it is a 12-inchThe Armstrong Furnace R47583 001 Control Board is a genuine OEM 2 stage ignition control board engineered for high efficiency heating systems. Designed for reliability in demanding environments, this integrated furnace control manages the complex ignition sequence and multi stage firing rates required by Armstrong Air, AirEase, Ducane, and Lennox equipment. This board features advanced electronic circuitry to ensure precise flame sensing and timing,