Brochure

5
Draft Control
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.
MATERIAL GAUGES
MATERIAL GAUGES
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
US
Size 6" 7" 8" 9"
RING 24 22 20 20
GATE 26 22 20 20
COLLAR 26 26 24 24
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
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
MG-1
M