Multi-Blade Fire and Combination Fire Smoke Dampers8
Damper
Sleeve
Metal Stud
or Runner
Two layers of 1/2 in. UL
Classified Gypsum
Wallboard for 2 hour
rated walls. One layer
for 1 hour rated walls
(see UL Rated Wall
Design for Additional
Details).
Figure 12: Single Side Angle With Steel Stud Wall - Angle
Under Wallboard
Masonry or
Concrete
Wall
Damper
Sleeve
Angle Fastener
Masonry or
Concrete
Floor
Damper
Sleeve
Angle Fastener
Top Side
Figure 13: Single Side Angle With Masonry or Concrete
Wall and Floor
Grille Installations (Dampers up to 36 in. x 36 in. [914 mm x 914 mm])
Retaining angles used in conjunction with grille installations must be a minimum of
5
⁄8 in. x 1 in. (15 mm x 25 mm) 16
gauge (1.5 mm) steel. Space screws a maximum of 6 in. (152 mm) O.C. and a maximum of 2 in. (51 mm) from the
corners (minimum of 2 screws per side). See Figure 14 and Figure 15.
Note: Screws used to attach grille are allowed to penetrate reversed angle leg.
Damper
Sleeve
Angle Fastener
Grille (supplied
by others)
#10 sheet metal screws
spaced 6 in. on center
and a maximum of 2 in.
from the corners
(minimum of 2 screws per
side). Screw into studs so
as to avoid space
conflicts with the grille
Stud or Runner
Retaining Angle/Flange
Two layers of 1/2 in.
UL Classified Gypsum
Wallboard for 2 hour
rated walls. One layer
for 1 hour rated walls
(see UL Rated Wall
Design for Additional
Details).
Figure 15: Metal Stud - Grille
Two layers of 1/2 in. UL
Classified Gypsum
Wallboard for 2 hour
rated walls. One layer for
1 hour rated walls (see
UL Rated Wall Design for
Additional Details).
Grille (supplied by others)
Retaining Angle
Angle Fastener
Damper Sleeve
#10 sheet metal screws, 2
1/2 inches long, spaced 6
in. on center and a
maximum of 2 in. from the
corners (minimum of 2
screws per side). Screw
into studs so as to avoid
space conflicts with the
grille.
2 1/2 in. minimum
Stud or Runner
Figure 14: Wood Stud - Grille
Duct to Sleeve Connection
Sleeve Gauge and Connection Type Requirements
Sleeve Gauge Duct Dimension Type of Duct to Sleeve Connection Permitted
14 ga. (0.075 in.) - 10 ga. (0.138 in.)
[2 mm - 3.5 mm]
All duct sizes
Rigid or
Breakaway
16 ga. (0.060 in.)
[1.5 mm]
36 in. (914 mm) max. width
24 in. (610 mm) max. height
24 in. (610 mm) diameter
Rigid or Breakaway
16 ga. (0.060 in.) [1.5 mm] All duct sizes
Breakaway only
18 ga. (0.048 in.) [1.2 mm] 85 in. (2159 mm) wide and over
20 ga. (0.036 in.) [0.9 mm] 55 in. - 84 in. wide (1397 mm - 2134 mm)
22 ga. (.030 in.) [0.76 mm] 31 in. - 54 in. wide (787 mm - 1372 mm)
24 ga. (0.024) [0.6 mm] 13 in. - 30 in. wide (330 mm - 762 mm)
26 ga. (0.018 in.) [0.46 mm] 12 in. wide and under (305 mm)
See Breakaway Connection section for additional information.
UL Standard 555 requires all ducts to terminate at fire damper sleeves.
The size of the damper/duct determines the required sleeve gauge and the required duct to sleeve connection
(see table below). The sleeve thickness must also not be less than the gauge of the connecting duct. Any duct
connection other than the breakaway connections described below are considered rigid.
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