Preparation Of Openings - Greenheck DFD Series Installation, Operation And Maintenance Manual

Preparation of Openings

• Frame wall openings as shown below (see Figure 1, 2, and 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.
Second set of studs are not required on openings 36 in. x 36 in. (914mm x 914mm) or smaller.
24 in. o.c.
Maximum
(metal studs)
12 in.
24 in. o.c.
Maximum
16 in. o.c.
Maximum
(wood studs)
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Figure 1
Floor Runner
Metal Stud Construction
Gypsum Wallboard
Retaining
Angle
In metal stud construction,
Damper
exposed steel surfaces need
Sleeve
not be covered with gypsum
wallboard.
Figure 2A
Wooden Stud Construction
Gypsum Wallboard
Retaining
Angle
In wood stud construction,
Damper
Sleeve gypsum wallboard must cover
all wood stud surfaces.
Figure 3 (2 sided angle installation shown)
24 in. o.c.
Ceiling Runner
Maximum
(metal studs)
2 in. (51mm)
2 Panhead
Screws
2 in. (51mm)
16 in. o.c.
Maximum
(wood studs)
Stud or Runner
1 in. Min.
Metal stud only
Stud or Runner
1 in. Min.
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Metal stud only
Figure 2
Metal Stud Construction
Gypsum Wallboard
Retaining
Angle
In metal stud construction,
Damper
exposed steel surfaces need
Sleeve
not be covered with gypsum
wallboard.
Figure 4 (2 sided angle installation shown)
Wooden Stud Construction
Multi-Blade Fire and Combination Fire Smoke Dampers
Gypsum Wallboard
Stud or Runner
1 in. Min.
3