A draft regulator (or barometric draft regulator) is a device designed to maintain a proper draft in an oil-fired furnace by automatically reducing the chimney draft (i.e. the flue draft) to the desired value. Draft regulators are recommended on all installations for each oil-fired appliance connected to a chimney unless the appliance is listed for use without one.

Do not use a small draft regulator, because they will not do a satisfactory job. The draft regulator should be installed in the horizontal flue pipe as close as possible to the chimney. When this flue pipe is too short for a satisfactory installation, the draft regulator should be installed in the chimney. Some authorities oppose installing the draft regulator in the chimney, but experience has shown that this can be a very satisfactory installation.

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