Greenheck DFD Series - Preparation of Openings

Preparation of Openings
• Frame wall openings as shown below (see Figure 1, 2, & 2A).
• Gypsum wall board must be fastened 12 in. (305mm) on center (O.C.) to all stud and runner flanges surrounding
opening.
• Prepare opening between studs and sleeve assembly as shown below (see Figure 3 & 4).
• All construction and fasteners must meet the requirements of the appropriate wall design (See UL Fire Resistance
Directory) and/or local codes.
Figure 1
12 in.
24 in. o.c.
Maximum
24 in. o.c.
Maximum
(metal studs)
24 in. o.c.
Maximum
(metal studs)
16 in. o.c.
Maximum
(wood studs)
16 in. o.c.
Maximum
(wood studs)
Ceiling Runner
2 Panhead
Screws
2 in. (51mm)
2 in. (51mm)
Floor Runner
Figure 2
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Metal stud only
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Metal stud only
Metal Stud Construction
Wooden Stud Construction
In wood stud construction,
gypsum wallboard must cover
all wood stud surfaces.
Gypsum Wallboard
Stud or Runner
Retaining
Angle
1 in. Min.
Damper
Sleeve
In metal stud construction,
exposed steel surfaces need
not be covered with gypsum
wallboard.
Gypsum Wallboar d
Stud or Runner
Retaining
Angle
1 in. Min.
Damper
Sleeve
Figure 3 (2 sided angle installation shown)
Metal Stud Construction
Wooden Stud Construction
In wood stud construction,
gypsum wallboard must cover
all wood stud surfaces.
Gypsum Wallboard
Stud or Runner
Retaining
Angle
1 in. Min.
Damper
Sleeve
In metal stud construction,
exposed steel surfaces need
not be covered with gypsum
wallboard.
Gypsum Wallboar d
Stud or Runner
Retaining
Angle
1 in. Min.
Damper
Sleeve
Figure 4 (2 sided angle installation shown)
Figure 2A
3
Curtain Fire Dampers