Securing the Damper/Sleeve Assembly to Wall/Floor Openings cont.......
Damper
Sleeve
Angle Fastener
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 10: Single Side Angle With Steel Stud Wall -
Angle Over Wallboard
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
Stud or Runner
Damper
Sleeve
Angle Fastener
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 11: Single Side Angle With Wood Stud Wall
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. [914mm x 914mm])
Retaining angles used in conjunction with grille installations must be a minimum of
5
⁄8 in. x 1 in. (15mm x 25mm)
16 gauge (1.5mm) steel. Space screws a maximum of 6 in. (152mm) O.C. and a maximum of 2 in. (51mm) 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
Multi-Blade Fire and Combination Fire Smoke Dampers8
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