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DRAFT CONTROL
TYPE M+MG2
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.
NOMINAL
CONTROL
MODEL
CAPACITY
SIZE
(SQ. IN.)
10" M+MG2*
10
78.5
12" M+MG2*
12
1 13
14" M+MG2*
14
154
16" M+MG2
16
201
18" M+MG2
18
255
20" M+MG2**
20
314
24" M+MG2**
24
452
28" M+MG2**
28
616
32" M+MG2**
32
804
*CSA certified
**An increaser or reducer may be necessary in order for the Barometric
Draft Control to adapt to off-sized pipe.
MATERIAL GAUGES
SIZE
10"
12"
14"
16"
RING
20
20
20
18
GATE
18
16
16
16
COLLAR
24* 24* 22* 20* 20* 18* 18* 14** 14**
* Galvanized
**HRPO with Enamel Finish
32
SPECIFICATIONS
RECOMMENDED PIPE SIZES (IN.)
Dia.
Circum.
A
9 - 10
28
⁄
to 31
⁄
10
1
1
4
2
1 1 - 12
34
⁄
to 37
⁄
12
1
3
2
4
13 - 14
40
⁄
to 44
14
3
4
15 - 16
47 to 50
⁄
16
1
4
17 - 18
53
⁄
to 56
⁄
18
1
1
2
2
19 - 21
59
⁄
to 66
20
3
4
22 - 25
69 to 78
⁄
24 12
1
2
26 - 30
81
⁄
to 94
⁄
28 13
3
1
4
4
31 - 34
97
⁄
to 107
32 15
1
2
18"
20"
24"
28"
32"
18
18
18
16
16
16
16
14
14
14
M+MG2
DIMENSIONS (INCHES)
B
C
D
E
F
G
4
⁄
5
4
⁄
1 1
3
⁄
1
3
1
3
1
8
4
8
5
⁄
6
5
13
⁄
4
⁄
1
3
1
5
3
4
4
8
7
⁄
7
5
⁄
15
⁄
5
⁄
2
1
3
1
3
1
8
4
2
8
8
⁄
8
6
⁄
17
⁄
6
⁄
2
3
1
1
1
3
8
2
2
8
8
⁄
9
7
⁄
19
⁄
6
⁄
2
1
1
1
7
3
4
2
2
8
9
⁄
10 8
⁄
22
7
⁄
3
5
1
5
8
8
8
⁄
12 10
⁄
26
9
⁄
3
3
1
1
5
8
2
4
⁄
14
-
30
⁄
10
⁄
4
1
1
3
1
8
2
4
⁄
16
-
35
12
⁄
4
3
1
3
8
4
Customer Service:
H
J
K
L
M
⁄
4
⁄
1
3
⁄
1
14
⁄
3
1
1
8
4
2
8
⁄
4
⁄
1
3
⁄
⁄
16
⁄
3
1
7
1
4
4
2
8
2
⁄
5
⁄
1
3
⁄
⁄
19
⁄
1
1
5
1
8
8
2
8
4
⁄
5
⁄
1
⁄
4
⁄
22
5
1
5
8
8
2
8
⁄
7
⁄
1
⁄
5
⁄
1
⁄
24
⁄
3
1
1
5
5
4
8
2
4
8
8
7
⁄
1
⁄
6
⁄
1
⁄
27
⁄
3
1
1
1
3
4
2
4
4
8
⁄
8
⁄
2
6
⁄
1
⁄
33
5
1
1
8
8
4
4
⁄
1 1
⁄
2
6
⁄
⁄
38
⁄
3
1
7
1
8
8
4
8
2
⁄
12
⁄
2
6
⁄
⁄
43
⁄
1
1
5
1
4
8
4
8
2
252.522.3031
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