Masonry or
Concrete Floor
Damper
Sleeve
Angle Fastener
(see Section 2)
Top Side
Figure 7: Masonry or Concrete Wall Figure 8: Concrete Floor
Copyright © 2013 Greenheck Corporation
474015 Single Side Retaining Angle Suppl Rev. 3 Jan 2013
Masonry or
Concrete Wall
Damper
Sleeve
Angle Fastener
(see Section 2)
2. Securing the Damper/Sleeve Assembly to the Wall/Floor opening cont.......
Grille Installations (Dampers up to 36 in. x 36 in.
[914mm x 914mm] maximum)
• Angle legs may be reversed and one leg inserted
into the wall/floor opening. Retaining angles used in
conjunction with grille installations must be a minimum
of 20 gauge (1mm) steel and have a minimum of
5/8 in. x 1 in. (15mm x 25mm) 20 gauge (1mm) steel.
Space screws a maximum of 6 in. (152mm) on center
and a maximum of 2 in. (51mm) from the corners
(minimum of 2 screws per side). See Figure 9 and
Figure 10.
Note: Screws used to attach grille are allowed to
penetrate reversed angle leg.
Damper
Sleeve
Angle Fastener
(see Note 2)
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
1
/2 in. UL Classified
Gypsum Wallboard (see
UL Rated Wall Design
for Additional Details)
2
1
/2 in. Min.
Stud or Runner
Retaining Angle
(See Section 2)
Figure 9: 1 Hour Wall Rating
Damper
Sleeve
Angle Fastener
(see Note 2)
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
1
/2 in. UL Classified
Gypsum Wallboard (see
UL Rated Wall Design
for Additional Details)
2
1
/2 in. Min.
Stud or Runner
Two layers of
Retaining Angle
(See Section 2)
Figure 10: 2 Hour Wall Rating
Note: For horizontal installations, retaining angles must be
mounted on top side of partition.
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