Greenheck DFD Series Installation, Operation And Maintenance Manual page 11

Securing the Damper/Sleeve Assembly to Wall/Floor Openings cont....
• Retaining Angle Attachment to Wall/Floor:
Two-Sided Angle Method: For two-sided angle
installations the retaining angles shall not be attached to
the wall/floor (see Figure 7).
Single Sided Angle Method: For single side installations
the retaining angles must be attached to the wall/floor (see
Figures 8-11). For metal stud partitions only, the single
side mounting angle may be directly attached to the metal
stud prior to the installation of the drywall.
• Retaining angles must be attached to the partition
using one of the methods shown below:
- Drywall screws of a length such that the
screw engages the steel stud/track by ½ in.
(13mm) (steel framing).
- Drywall screws of a length such that the screw engages the wood stud by 13/4 in. (44mm) (wood
framing).
- Steel anchors or self tapping concrete screws penetrating masonry or block 11/4 in. (31mm).
• A minimum of two connections per side are required. Additional connections made at a maximum of
12 in. (305mm) O.C. for openings of 48 in. W x 36 in. H (1219mm x 914mm) and less. Dampers greater
than 48 in. wide (1219mm) or 36 in. high (914mm) require the connections to be no more than 6 in.
(152mm) O.C.
Damper
Sleeve
Stud or Runner
Angle Fastener
Figure 8: Single Side Angle With Steel Stud Wall - Angle
Over Wallboard
Metal Stud
or Runner
Damper
Sleeve
Figure 10: Single Side Angle With Steel Stud Wall -
Angle Under Wallboard
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).
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).
Retaining
Angle
Figure 7: Two-Sided Angle Installation
Damper
Sleeve
Figure 9: Single Side Angle With Wood Stud Wall
Damper
Sleeve
Masonry or
Concrete
Wall
Angle Fastener
Figure 11: Single Side Angle With Masonry or
Concrete Wall and Floor
Wall or Floor
Min. 1 in.
overlay*
Retaining
angle
Sleeve
Duct
Damper
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).
Angle Fastener
Top Side
Angle Fastener
Damper
Sleeve
Curtain Fire Dampers
Masonry or
Concrete
Floor
7