The M control lends itself ideally to conditions requiring a great deal of stability and accuracy. Designed for settings from .01" to .1", the Field M Control is recommended for oil or coal-fired residential heating applications. The Type M features an infinitely variable screw adjustment, permitting an extremely fine instrument setting. The M employs side wings to control air direction with gate curvatures designed to compensate for differences in horizontal and vertical settings. These units can be used in Wood, Oil, or Coal residential applications.
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Comments about 7" Draft Regulator for Wood, Oil, or Coal:
Replaced a older Fields #7RC regulator with the 7M. Very quiet operation on windy days and draft set with instruments resulted in .02 factory draft required for my Weil mcLain wtgo3 boiler.I recommend this over the popular RC regulator.