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Lennox 10J58 is a microprocessor-based direct spark ignition (DSI) control board -- manages ignition sequencing for gas furnaces. Manufactured by Fenwal (Series 35-61).
Lennox 10J58 (also 10J5801). Manufactured by Fenwal, cross-referenced as 35-615908-223.
You'll receive the OEM part or a warrantied, direct-fit equivalent that meets or exceeds OEM spec.