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https://youtu.be/5YjL8eR5VJ0 How a furnace sequencer works
https://youtu.be/Mci7gysJtI4
https://youtu.be/0VdArgTiDyo
https://youtu.be/dO5_wuCWFqA How a typical gas furnace works.
https://youtu.be/heiY6LHGxeE
https://youtu.be/h_gLQHkqifQ