Brochure

2
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-1
M+MG2
How Draft Controls Work
Static pressure of the cool air (1) Illustration A 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 breaching 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