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There is some doubt among wood heat experts as to whether use of barometric draft regulators is wise. Draft regulators limit the draft-the suction pulling air into the appliance. A pivoted, counter-balanced flap is pulled open by the draft when the draft reaches a critical amount (figure 10). This permits air to enter the chimney, thus preventing the draft in the appliance from rising any higher. Use of draft regulators with oil-fired equipment is common. One objective is to keep the oil flame f