Specification

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Draft
Draft Control
For proper operation and efficient fuel consumption in oil, gas, and/or coal-fired heating appliances, draft must
remain constant. When it is, combustion is more complete, fuels are utilized efficiently, and money is saved. Field
Draft Controls maintain consistent draft by counteracting the negative forces caused by changes in temperature
and barometric pressure, as well as the effects of wind.
RC M
MG-1M+MG2
How Draft Controls Work
Static pressure of the cool air Illustration A (1) exerts
pressure on the outside of the furnace or boiler,
the breaching, and stack. The pressure difference
between the room air and heated gas (air) causes
products of combustion (2) to flow (draft) through the
unit and rise through the breach and chimney. Room
temperature air (3) enters through the barometric
draft control (4) in the precise amount needed to
overcome the excess drafts caused by temperature
variations, wind fluctuations, and barometric pressure
changes. Combustion of fuel is complete and the
process is stabilized. The velocity of combustion gases
through the heat exchanger is slowed so more heat is
extracted. The unit operates more efficiently, reliably,
and requires less maintenance.
Illustration A
Gas Installation