Baffles, throttles, and air doors, etc., play a significant role in improving combustion thermal efficiency, conserving energy, and reducing pollution. The insertion point of the ZO-300 plug-in zirconia probe into the flue must be under negative pressure, as the reference gas for the zirconia probe is air, which is naturally flowing. The flue must be under negative pressure to allow air to be drawn into the probe and generate an electric potential.

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