Lennox 10J58 T6-2102 Ignition Control. Lennox goal is to provide contractors with high-quality HVAC solutions and replacement parts. This system includes changes and inventory updates to ensure peak performance. Lennox has a large line up parts and products for high-efficiency packaged rooftop units, split systems, HVAC controls, furnaces and indoor air quality products. The Lennox 10J58 T6-2102 Ignition Control is designed to connect to thermostats. The controller is intended for residential natural or liquid propane fueled furnaces.