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Inches (mm)
Type CR Type CO & C Type R*
1
Minimum Maximum Minimum Maximum Minimum Maximum
Single Section
Vertical
3
(76)
31
(787)
3 x 3
(76 x 76)
34 x 31
(864 x 787)
3
(76)
34
(864)
Multi Section
Vertical**
NA
55
(1397)
NA
70 x 44
(1778 x 1118)
or
58 x 55
(1473 x 1397)
NA
58
(1473)
Single Section
Horizontal
3
(76)
25
(635)
3 x 3
(76 x 76)
28 x 25
(711 x 635)
3
(76)
28
(711)
Multi Section
Horizontal**
NA
31
(787)
NA
46 x 31
(1163 x 787)
NA
34
(864)
Dampers larger than maximum single section size are supplied as a factory assembly of
two or more sections of equal size. These multi-section damper assemblies may have
slightly less than 100% free area because of the mullions where damper sections join.
The following charts shows minimum and maximum damper section sizes . Dimensions
are in inches (mm in parentheses).
O*
H*
Type C
W*+2
W*
O*
H*
Type CO
W*+2
W*
D*
Type CR
O*
D*+2
Overall Damper Dimensions
31 in.
(787mm)
Max.
2
Multi-Section Limitations
Maximum damper height is 44" when combination width is 94" or less.
Maximum Single Section
Dimensions
Multi-Section Limitations
Maximum transition height is 36" when transition width is greater than 94" and less than or equal to 118".
3
Type COType C
36”
Max.
118”
Max.
118”
Max.
36”
Max.
94” Max.
or 72” Max.
31in.
(787mm)
Max.
31 in.
(787mm)
Max.
34 in.
(864mm)
Max.
34 in.
(864mm)
Max.
Multi-Section Limitations
Maximum damper height is 69" when combination width is 72" or less. (Vertical mullion provided on dampers over 34”
wide and 44” high.)
44” Max.
or 69” Max.
94” Max.
or 72” Max.
44” Max.
or 69” Max.
4
2
4
2
4
2
4
2
4
Reinforcement
Rods
DFD-155 TYPE CR, CO, C, & RSIZING DATA
Copyright © 2007 Greenheck Fan Corporation
DFD-155 Rev. 9 Sept 2007
C, CO, & CR transitions
are positioned 1 in.(25mm)
from bottom of sleeve.
*
1
With 2 in. (50mm) offset. Sizes adjust with 0 offset & 1 in. (25mm) offset.
** Consult factory for number of sections.
34 in. (889mm) max.
Type CR
Type R
Type R transition is centered on damper
frame. Dimensions are with 2 in. (50mm)
offset.
*
Dimensions are in inches (mm in parentheses).
These dimensions are furnished approximately 1/4
in. (6mm) undersize. (All 'H' dimensions larger than
single section height are two sections high. Refer
to chart.) Dimension are in inches (mm).
* All multiple section dampers, with transitions, will include a factory
installed 8 in. (203mm) sleeve.
H or D* O* H or D* O*
3 (76) 6 (152) 27 (686) 32 (813)
4 (102) 7 (178) 28 (711) 33 (838)
5 (127) 8 (203) 29 (737) 34 (864)
6 (152) 9 (229) 30 (762) 35 (889)
7 (178) 10 (254) 31 (787) 36 (914)
8 (203) 11 (279) 32 (813) 36 (914)
9 (229) 12 (305) 33 (838) 37 (940)
10 (254) 13 (330) 34 (864) 38 (965)
11 (279) 14 (356) 35 (889) 39 (991)
12 (305) 15 (381) 36 (914) 40 (1016)
13 (330) 16 (406) 37 (940) 41 (1041)
14 (356) 17 (432) 38 (965) 42 (1067)
15 (381) 19 (483) 39 (991) 43 (1092)
16 (406) 20 (508) 40 (1016) 44 (1118)
17 (432) 21 (533) 41 (1041) 45 (1143)
18 (457) 22 (559) 42 (1067) 46 (1168)
19 (483) 23 (584) 43 (1092) 47 (1194)
20 (508) 24 (610) 44 (1118) 48 (1219)
21 (533) 25 (635) 45 (1143) 50 (1270)
22 (559) 27 (686) 46 (1168) 51 (1295)
23 (584) 28 (711) 47 (1194) 52 (1321)
24 (610) 29 (737) 48 (1219) 53 (1346)
25 (635) 30 (762) 49 (1245) 54 (1372)
26 (660) 31 (787) 50 (1270) 55 (1397)