Greenheck DFD Series Installation, Operation And Maintenance Manual page 12

Securing the Damper/Sleeve Assembly to Wall/Floor Openings cont.......
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
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 12 and Figure 13.
Note: Screws used to attach grille are allowed to penetrate reversed angle leg.
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.
Angle Fastener
Grille (supplied by others)
Figure 12: Wood Stud - Grille
1/4 in. minimum
total clearance
Wall or Floor
Maximum
Maximum
6 in.
6 in.
Duct
Damper
Retaining Angles
Type A
Factory or Field installed Sleeve
Wall or Floor
Duct
Type B
On types R, CO & CR factory
furnished duct collar
qualifies as breakaway
Wall or Floor
connection.
Wall or floor
Type B2
Factory Sleeve
8
Curtain Fire Dampers
Duct
2 1/2 in. minimum
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).
Retaining Angle
Max. 6 in.
Maximum
6 in.
Max. 6 in.
Duct
Retaining Angles
(See Section 4)
Damper
Damper
Retaining angle leg
shall not exceed 7 in.
(178mm)
Sleeve
Field Installed Sleeve
Figure 14: Damper/Sleeves with Transition
On types R & CR factory
furnished duct collar
qualifies as breakaway
Damper
connection (See Connecting
Damper
Sleeve
#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
Angle Fastener
Grille (supplied
by others)
Figure 13: Metal Stud - Grille
1/4 in. minimum
total clearance
(See Section 1)
Retaining Angles
Wall or floor
Maximum
6 in.
"K" side
Damper
Sleeve
Damper
Duct
Type B
Sleeve
(See Sleeve Requirements)
Factory Sleeve
Type A
Wall or floor
Sleeve
Damper
Type B2
Duct
Type B
Wall or floor
Maximum
6 in.
⁄ in. x 1 in. (15mm x 25mm)
5
8
Duct
Retaining Angles
Type A
1/4 in. minimum
total clearance
(See Section 1)
Stud or Runner
Maximum
6 in.
Retaining Angle/Flange Duct
Type B
On types R, CO & CR factory
Duct
furnished duct collar
qualifies as breakaway
Retaining Angles
connection.
(See Section 4)
Type A
Wall or
Retaining angle leg
1 in. min.
Floor
shall not exceed 7 in.
overlap
(178mm)
Four sides
Mounting Angles
(See Para. 4)
1/4 in. minimum
total clearance
Duct
(See Para. 1)
Type C, CO, CR, & R
Factory Sleeve
Type B
Damper
On types R & CR factory
furnished duct collar
qualifies as breakaway
connection (See Connecting
Ducts to Fire Damper Sleeve)
Wall or floor
Duct
Sleeve
Type C, CO, CR & R
Field installed Sleeve
Maximum
6 in.
Damper
Wall or Floor
Damper
Two layers of 1/2 in.
Wall or floor
UL Classified Gypsum
Wallboard for 2 hour
rated walls. One layer
Maximum
for 1 hour rated walls
6 in.
(see UL Rated Wall
Design for Additional
Details).
Damper
Sleeve
(See Sleeve Requirements)
Wall or Floor
Wall or floor
Sleeve
Damper
Damper
Duct
Wall or floor
Damper
Sleeve