Specification

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Draft
Draft Control
Specifications
Model
Control
Size
Nominal
Capacity
Sq. In.
Recommended Pipe Sizes (in.) Dimensions (inches)
Dia. Circum. A B C D E G H M
4" RC
4 12.6 3-4-5 9
1
⁄2 to 15
3
⁄4 4 2
1
⁄2 2 2
5
⁄16 4
9
⁄16 1 2
1
⁄2 7
5" RC/RCBT
5 19.6 4-5-6 12
1
⁄2 to 19 5 2
1
⁄2 2 2
5
⁄16 5
9
⁄16 1 2
1
⁄2 7
6" RC/RCBT
6 28.3 5-6-7 15
3
⁄4 to 22 6 1
7
⁄8 3 2 6
5
⁄8 1 2
3
⁄4 7
5
⁄8
7" RC
7 38.5 6-7-8 19 to 25
1
⁄4 7 2
5
⁄8 3
1
⁄2 2
1
⁄2 7
5
⁄8 1 2
3
⁄4 8
5
⁄8
8" RC/RCBT
8 50.3 7-8-9 22 to 28
1
⁄8 8 4
3
⁄8 4 3
3
⁄8 8
11
⁄16 1
1
⁄8 2
5
⁄8 11
9" RC
9 63.6 8-9-10 25
1
⁄4 to 31
1
⁄2 9 5
1
⁄8 4
1
⁄2 3
3
⁄4 9
11
⁄16 1
1
⁄2 2
5
⁄8 12
1
⁄4
Type MG-1
Gas
A double-acting control for gas-fired
furnaces and boilers is widely used for
conversion burner installations, gas
draft-induced appliance operation with
mechanical draft inducers, or sidewall
power venters. It is also recommended
for use on gas atmospheric appliances
where a draft hood cannot be installed,
and can improve combustion stability
and draft on many gas atmospheric
installations with venting problems. The MG-1
provides precise, accurate control of drafts at levels higher than
permitted by a standard draft diverter, which is a frequent requirement
with gas. Because it is double-acting, it opens out to relieve positive
vent system pressures as low as .01". Draft adjustments using weights
are simple and accurate from .01" to .1".
Type M
Oil or Coal - Residential
The M control lends itself ideally to conditions
requiring a great deal of stability and accuracy.
Designed for settings from .01" to .1", the Field
M Control is recommended for oil or coal-fired
residential heating applications. The Type M
features an infinitely variable screw adjustment,
permitting an extremely fine instrument setting. The M employs
side wings to control air direction with gate curvatures designed
to compensate for differences in horizontal and vertical settings.
MG-1
ABCDEFGHIJKLM
Material Gauges
Size 6" 7" 8" 9"
RING
24 22 20 20
GATE
26 22 20 20
COLLAR
26 26 24 24
Specifications
Model
Control
Size
Nominal
Capacity
Sq. In.
Recommended
Pipe Sizes (in.)
Dimensions (inches)
Dia. Circum. A B C D E G M
6" M
6 28.3 5-6-7 15
3
⁄4 to 22 6 5 3 3
1
⁄4 6
17
⁄32 2 8
7" M
7 38.5 6-7-8 19 to 25
1
⁄4 7 5
1
⁄4 3
1
⁄2 3
3
⁄4 7
3
⁄8 2
1
⁄4 8
3
⁄4
8" M
8 50.3 7-8-9 22 to 28
1
⁄4 8 6
3
⁄8 4 3
3
⁄8 8
5
⁄8 3 10
3
⁄8
9" M
9 63.6 8-9-10 25
1
⁄4 to 31
1
⁄2 9 7
1
⁄4 4
1
⁄2 3
3
⁄4 9
5
⁄8 1
29
⁄32 11
3
⁄4
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
4" MG-1
4 12.6 3 - 4 9
1
⁄2 to 12
1
⁄2 4 2
1
⁄2 2 2
5
⁄16 4
9
⁄16 1
1
⁄2
1
⁄4 2
1
⁄2
1
⁄2 1
1
⁄4
3
⁄8 7
5" MG-1
5 19.6 4 - 5 12
1
⁄2 to 15
3
⁄4 5 2
1
⁄2 2 2
5
⁄16 5
9
⁄16 2
5
⁄8 2
1
⁄2
1
⁄2 1
1
⁄4
1
⁄2 7
6" MG-1
6 28.3 5 - 6 15
3
⁄4 to 19 6 2
11
⁄16 3 3
1
⁄4 6
5
⁄8 2
1
⁄8
13
⁄16 2
3
⁄4
3
⁄4 1
3
⁄4
5
⁄8 8
7
⁄16
7" MG-1
7 38.5 6 - 7 19 to 22 7 3
3
⁄8 3
1
⁄2 3
3
⁄4 7
5
⁄8 2
3
⁄8 1
1
⁄8 2
3
⁄4
3
⁄4 2
1
⁄4 9
5
⁄8
8" MG-1
8 50.3 7 - 8 22 to 25
1
⁄4 8 4
3
⁄8 4 3
3
⁄8 8
11
⁄16 3 1
1
⁄2 2
5
⁄8
3
⁄4 2
1
⁄4
3
⁄8 11
9" MG-1
9 63.6 8 - 9 25
1
⁄4 to 28
1
⁄4 9 5
1
⁄8 4
1
⁄2 3
3
⁄4 9
11
⁄16 3
1
⁄2 1
3
⁄4 2
5
⁄8
3
⁄4 2
1
⁄2
3
⁄8 12
1
⁄4
Material Gauges
Size 4" 5" 6" 7" 8" 9"
RING
24 24 24 22 20 20
GATE
24 24 24 22 20 20
COLLAR
26 26 26 26 26 26
ABCDEFGHIJKLM
M