Maximum Assembly Tables
When multiple sections are shipped unassembled, installer shall fasten dampers together. The table shows
maximum sizes for multiple section dampers. Dampers that are two or more sections tall must be factory
assembled.
Note:
All dimensions are shown in inches (W x H). * Sizes listed refer to the damper size, not transition
size.
Damper Model
Mounting
Maximum Single
Section Damper Sizes*
Maximum Multi-Section
Damper Sizes*
FD-100, FD-300, FD-310, SSFD-350
Vertical
48 X 48 (1219 mm x 1219 mm)
-
FD-150
Vertical or Horizontal
48 X 48 (1219 mm x 1219 mm)
96 x 48 (2438 mm x 1219 mm) or
74 x 74 (1880 mm x 1880 mm) or
120 x 40 (3048 mm x 1016 mm)
FD-110
Vertical or Horizontal
48 x 48 (1219 mm x 1219 mm)
96 x 48 (2438 mm x 1219 mm)
SSFD-150
Vertical
48 X 48 (1219 mm x 1219 mm)
96 X 48 (2438 mm x 1219 mm) or
120 X 40 (3048 mm x 1016 mm)
Horizontal
36 x 36 (914 mm x 914 mm)
-
FD-350
Vertical
48 x 48 (1219 mm x 1219 mm)
-
Horizontal
40 x 40 (1016 mm x 1016 mm)
80 x 40 (2032 mm x 1016 mm)
KFD-150
Vertical or Horizontal
36 x 16 (914 mm x 406 mm)
96 x 48 (2438 mm x 1219 mm) or
120 x 40 (3048 mm x 1016 mm)
KFD-350
Vertical
36 x 16 (914 mm x 406 mm)
-
Horizontal
36 x 16 (914 mm x 406 mm)
80 x 40 (2032 mm x 1016 mm)
DFD-150, DFD-110
Vertical
36 x 36 (914 mm x 914 mm)
72 x 48 (1828 mm x 1219 mm) or
60 x 60 (1524 mm x 1524 mm) or
120 x 30 (3048 mm x 762 mm)
Horizontal
24 x 18 (610 mm x 457 mm)
48 x 36 (1217 mm x 914 mm)
30 x 30 (762 mm x 762 mm)
-
DFD-350
Vertical
36 x 36 (914 mm x 914 mm)
-
Horizontal
24 x 18 (610 mm x 457 mm)
48 x 36 (1217 mm x 914 mm)
30 x 30 (762 mm x 762 mm)
DFD-310
Vertical
36 x 36 (914 mm x 914 mm)
-
Horizontal
30 x 30 (762 mm x 762 mm)
-
SSDFD-150. SSDFD-350
Vertical
30 x 30 (762 mm x 762 mm)
-
FD-150X
Vertical or Horizontal
48 x 48 (1219 mm x 1219 mm)
-
DFD-150X
Vertical
36 x 36 (914 mm x 914 mm)
-
Horizontal
30 x 30 (762 mm x 762 mm)
-
All fire dampers must be installed in a steel sleeve of the required gauge and length. Note that DFD-150X and
FD-150X series dampers are provided with an integral sleeve. See
Table on page 9
for required minimum sleeve
gauges. Maximum sleeve thickness is 10 gauge (3.5 mm). Sleeve inside dimensions must equal damper outside
dimensions.
Sleeves shall extend a maximum of 6 in. (152 mm) beyond the wall or floor opening on each side. When a factory
mounted access door is incorporated as a part of the sleeve, the sleeve may extend a maximum of 16 in. (406 mm)
beyond the wall or floor opening on the access door side.
Fire dampers must be attached to sleeves as shown in
Figure 6
. All four sides of the damper frame must be
attached to the sleeve with one row of attachments on each side of the blade channel. Attachments must be spaced
a maximum of 6 in. (152 mm) O.C. and a maximum of 2 in. (51 mm) from corners. A minimum of 4 attachments (2
on each side of the blade channel) per side (16 per damper) are required. One of the methods of attachment shown
below must be used:
• tack or spot welds
• #10 sheet metal screws
•
1
⁄
4
in. (6 mm) bolts and nuts
•
3
⁄
16
in. (4.7 mm) steel pop rivets
Sleeve Requirements
Curtain Fire Dampers
5
®
