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Draft Control

Draft Control, Type M+MG2

Type M+MG2 Draft Control for Solid, Oil or Gas Commercial/Industrial Applications

The Type M+MG2 Draft Control models are a series of compact, rugged, heavy-duty controls for use on large residential, commercial and industrial applications. The Field Controls Type M+MG2 Draft Control provides precise draft regulators for solid fuels, oil, gas, or oil/gas appliances requiring only the simplest, on-the-job adjustments depending on which fuel is to be utilized.

In a gas installation, the double-acting Type M+MG2 is specified instead of a draft hood to give the appliance the assistance of the chimney. In a duel fuel oil/gas or a gas-fired only application, use the M+MG2 as a double-acting draft control with the optional Field Thermal Switch accessory. Use the M+MG2 as a single-acting draft control for oil or solid fuel applications.

For any installation with 10″ or larger diameter vent pipe, specify the Field Controls standard M+MG2 Draft Control. This unit that can be adapted to any fuel. The moving part (gate) rests on a long, thin, stainless steel knife edge which, in turn, is supported by self-aligning and self-cleaning bearings. When the heavy gauge gate moves, only the knife edge rests on the bearing for minimum friction and maximum sensitivity to draft changes.

How do draft controls work? Static pressure of the cool air 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 to flow (draft) through the unit and rise through the breach and chimney. Room temperature air enters through the barometric draft control 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.

When to use a draft control? Refer to our Contractor Reference Guide on when to use a draft control with a draft inducer/power venter, power burners, forced draft burners, dual fuel appliances and gas-fired appliances.

Specifications

PART # MODEL CONTROL SIZE VOLTAGE NOMINAL CAPACITY (sq. in.)
RECOMMENDED PIPE SIZE (ins.)
Diameter Circumfrence
DIMENSIONS (ins.)
A B C D E G H J K L M
01950201 10"M+MG2 10 78.50 9-10 28.25 to 31.5 10.00 4.38 5.00 4.25 11.00 3.38 1.13 4.75 1.00 3.50 1.00 14.13
01952701 12"M+MG2 12 113.00 11-12 34.5 to 37.75 12.00 5.75 6.00 5.00 13.25 4.63 1.75 4.75 1.00 3.50 0.87 16.50
01986901 14"M+MG2 14 154 13-14 40.75 to 44 14.00 7.13 7.00 5.75 15.50 5.38 2.13 5.13 1.00 3.50 0.62 19.25
01987001 16"M+MG2 16 201 15-16 47 to 50.25 16 8.38 8.00 6.50 17.50 6.13 2.38 5.63 1.50 4 0.62 22
01987101 18"M+MG2 18 255 17-18 53.5 to 56.5 18 8.25 9.00 7.50 19.50 6.88 2.75 7.38 1.50 5.25 1.63 24.63
01988601 20"M+MG2 20 314 19-21 59.75 to 66 20 9.63 10.00 8.13 22.00 7.63 3.00 7.75 1.50 6.25 1.25 27.38
01967701 24"M+MG2 24 452 22-25 69 to 78.5 24 12.38 12.00 10.50 26.00 9.25 3.63 8.63 2.00 6.25 1.25 33.00
38.50 0.87 6.25 2.00 11.38 4.13 10.75 30.50 - 14.00 13.13 28 81.75 to 94.25 26-30 616 28 28"M+MG2 01967601
01967201 32"M+MG2 32 804 31-34 97.5 to 107 32 15.38 16.00 - 35.00 12.25 4.75 12.13 2.00 6.25 0.62 43.50
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