Specification

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Draft
Draft Control
Solid, Oil or Gas Commercial/Industrial
This is a series of compact, rugged, heavy-duty
controls for use on large residential, commercial,
and industrial applications. The Field Type M+MG2
Draft Control provides precise draft regulations
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 our standard M+MG2 Draft
Control, the 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.
*CSA certified
**An increaser or reducer may be necessary in order for the
Barometric Draft Control to adapt to off-sized pipe.
Type M+MG2
Material Gauges
Size 10" 12" 14" 16" 18" 20" 24" 28" 32"
RING
20 20 20 18 18 18 18 16 16
GATE
18 16 16 16 16 16 14 14 14
COLLAR
24* 24* 22* 20* 20* 18* 18* 14** 14**
Specifications
Model
Control
Size
Nominal
Capacity
(Sq. In.)
Recommended Pipe Sizes (in.) Dimensions (inches)
Dia. Circum. A B C D E F G H J K L M
10" M+MG2*
10 78.5 9 - 10 28
1
⁄4 to 31
1
⁄2 10 4
3
⁄8 5 4
1
⁄4 11 3
3
⁄8 1
1
⁄8 4
3
⁄4 1 3
1
⁄2 1 14
1
⁄8
12" M+MG2*
12 113 11 - 12 34
1
⁄2 to 37
3
⁄4 12 5
3
⁄4 6 5 13
1
⁄4 4
5
⁄8 1
3
⁄4 4
3
⁄4 1 3
1
⁄2
7
⁄8 16
1
⁄2
14" M+MG2*
14 154 13 - 14 40
3
⁄4 to 44 14 7
1
⁄8 7 5
3
⁄4 15
1
⁄2 5
3
⁄8 2
1
⁄8 5
1
⁄8 1 3
1
⁄2
5
⁄8 19
1
⁄4
16" M+MG2
16 201 15 - 16 47 to 50
1
⁄4 16 8
3
⁄8 8 6
1
⁄2 17
1
⁄2 6
1
⁄8 2
3
⁄8 5
5
⁄8 1
1
⁄2 4
5
⁄8 22
18" M+MG2
18 255 17 - 18 53
1
⁄2 to 56
1
⁄2 18 8
1
⁄4 9 7
1
⁄2 19
1
⁄2 6
7
⁄8 2
3
⁄4 7
3
⁄8 1
1
⁄2 5
1
⁄4 1
5
⁄8 24
5
⁄8
20" M+MG2**
20 314 19 - 21 59
3
⁄4 to 66 20 9
5
⁄8 10 8
1
⁄8 22 7
5
⁄8 3 7
3
⁄4 1
1
⁄2 6
1
⁄4 1
1
⁄4 27
3
⁄8
24" M+MG2**
24 452 22 - 25 69 to 78
1
⁄2 24 12
3
⁄8 12 10
1
⁄2 26 9
1
⁄4 3
5
⁄8 8
5
⁄8 2 6
1
⁄4 1
1
⁄4 33
28" M+MG2**
28 616 26 - 30 81
3
⁄4 to 94
1
⁄4 28 13
1
⁄8 14 - 30
1
⁄2 10
3
⁄4 4
1
⁄8 11
3
⁄8 2 6
1
⁄4
7
⁄8 38
1
⁄2
32" M+MG2**
32 804 31 - 34 97
1
⁄2 to 107 32 15
3
⁄8 16 - 35 12
1
⁄4 4
3
⁄4 12
1
⁄8 2 6
1
⁄4
5
⁄8 43
1
⁄2
* Galvanized **HRPO with Enamel Finish
M+MG2