Greenheck DFD Series Installation, Operation And Maintenance Manual page 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:
- #10 screws of a length such that the screw engages the steel stud/track by ½ in. (13 mm) (steel framing).
- #10 screws of a length such that the screw engages the wood stud by 13/4 in. (44 mm) (wood framing).
- Steel anchors or self tapping concrete screws penetrating masonry or block 11/4 in. (31 mm).
• A minimum of two connections per side are required. Additional connections made at a maximum of 12 in. (305
mm) O.C. for openings of 48 in. W x 36 in. H (1219 mm x 914 mm) and less. Dampers greater than 48 in. wide
(1219 mm) or 36 in. high (914 mm) require the connections to be no more than 6 in. (152 mm) 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
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
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 12 and Figure 13.
Note: Screws used to attach grille are allowed to penetrate reversed angle leg.
®
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).
Damper
Sleeve
Stud or Runner
Angle Fastener
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
⁄ in. x 1 in. (15 mm x 25 mm) 16
5
8
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).
Top Side
Angle Fastener
Damper
Sleeve
Masonry or
Concrete
Floor
Curtain Fire Dampers 7