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 (1219mm x 1219mm) -
FD-150 Vertical or Horizontal 48 X 48 (1219mm x 1219mm)
96 x 48 (2438mm x 1219mm) or
120 x 40 (3048mm x 1016mm)
FD-110 Vertical or Horizontal 48 x 48 (1219mm x 1219mm) 96 x 48 (2438mm x 1219mm)
SSFD-150
Vertical 48 X 48 (1219mm x 1219mm)
96 X 48 (2438mm x 1219mm) or
120 X 40 (3048mm x 1016mm)
Horizontal 36 x 36 (914mm x 914mm) -
FD-350
Vertical 48 x 48 (1219mm x 1219mm) -
Horizontal 40 x 40 (1016mm x 1016mm) 80 x 40 (2032mm x 1016mm)
KFD-150 Vertical or Horizontal 36 x 16 (914mm x 406mm)
96 x 48 (2438mm x 1219mm) or
120 x 40 (3048mm x 1016mm)
KFD-110 Vertical or Horizontal 36 x 16 (914mm x 406mm) 96 x 48 (2438mm x 1219mm)
SSKFD-150 Vertical 36 x 16 (914mm x 406mm)
96 X 48 (2438mm x 1219mm) or
120 X 40 (3048mm x 1016mm)
KFD-350
Vertical 36 x 16 (914mm x 406mm) -
Horizontal 36 x 16 (914mm x 406mm) 80 x 40 (2032mm x 1016mm)
SSKFD-350 Vertical 36 x 16 (914mm x 406mm) -
DFD-150, DFD-110
Vertical 36 x 36 (914mm x 914mm)
72 x 48 (1828mm x 1219mm) or
60 x 60 (1524mm x 1524mm) or
120 x 30 (3048mm x 762mm)
Horizontal
24 x 18 (610mm x 457mm) 48 x 36 (1217mm x 914mm)
30 x 30 (762mm x 762mm) -
DFD-350
Vertical 36 x 36 (914mm x 914mm) -
Horizontal
24 x 18 (610mm x 457mm) 48 x 36 (1217mm x 914mm)
30 x 30 (762mm x 762mm)
DFD-310
Vertical 36 x 36 (914mm x 914mm) -
Horizontal 30 x 30 (762mm x 762mm) -
SSDFD-110, SSDFD-150. SSDFD-350 Vertical 30 x 30 (762mm x 762mm) -
FD-150X Vertical or Horizontal 48 x 48 (1219mm x 1219mm) -
DFD-150X
Vertical 36 x 36 (914mm x 914mm) -
Horizontal 30 x 30 (762mm x 762mm) -
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 (3.5mm). Sleeve inside dimensions must equal damper outside
dimensions.
Sleeves shall extend a maximum of 6 in. (152mm) 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. (406mm)
beyond the wall or floor opening on the access door side.
Sleeve Requirements
5
Curtain Fire Dampers
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