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FACE VIEW
(BLADES SHOWN OPEN)
39M UNIT
SIZE
A
B
72W
113.00
46.00
85W
132.00
46.00
96W
132.00
52.00
110W
150.00
52.00
LEGEND
AMS
— Air Measuring Station
NOTE: A and B dimensions are actual to O.D. of damper frames not including flanges.
MIXING BOX/INLET PLENUM/DISCHARGE PLENUM/
EXTERNAL BYPASS/RETURN FAN
Attach the ductwork to the box frame rails with sheet metal screws
as shown in Fig. 38. Ductwork should be flanged out as close to
the damper framed opening as possible. Screws with weatherproof
washers and a bead of silicone around the duct flange must be
used for outdoor applications. Do not remove the screws retaining
the damper frame; the damper will fall out.
SIDE VIEW
A / 3
E1
B1 D1
B
B2 D2
.219 ± .031 DIA. HOLES at 6" C-C
WITH RANDOM START POINT
DIMENSIONS (in.)
A/3
B1
B2
37.60
27.60
18.40
44.00
27.60
18.40
44.00
31.20
20.80
50.00
31.20
20.80
Fig. 37 — AMS Damper Dimensions (cont)
15.00
X1 ± .25
X2 ±.25
A
A / 3
E1
SIZES 72-110
X1
X2
D1
11.74
11.96
24.60
11.74
11.96
24.60
13.52
14.36
28.20
13.52
14.36
28.20
MIXING BOX/INLET PLENUM/DISCHARGE PLENUM
(BOTTOM)
IMPORTANT: For all sizes with bottom full openings, attach
ductwork to inside of baserails.
Refer to Fig. 39 for bottom opening ductwork connection.
100
a39-4306
.50 TYP.
4 CORNERS
A / 3
.25 DIA HOLES
E1
TYP. 4 CORNERS
.50 TYP.
4 CORNERS
AIR
MEASUREMENT
DAMPER
.44 TYP.
4 SIDES
(TYP.)
PREMIUM
DAMPER
AMS
LOW
LIMIT
D2
E1
(CFM)
15.02
35.42
6,115
15.02
41.71
7,208
16.85
41.71
8,148
16.85
47.72
9,174
AMS
HIGH
LIMIT
(CFM)
40,768
48,052
54,319
61,159
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