Preparation of Openings
• Frame wall openings as shown below (
see Figure 1, 2, and 2A
).
• Gypsum wall board must be fastened 12 in. (305 mm) on center 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
Floor Runner
2 in.
Ceiling Runner
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)
2 in.
2 panhead
screws
Figure 2
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Metal stud only
24 in.
(610mm)
O.C. max.
Detail A-A
Detail
A-A
Floor
Runner
Ceiling
Runner
Notched Piece
Bent Down
Metal Stud
Framing Shown
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Metal stud only
24 in.
(610mm)
O.C. max.
Detail A-A
Detail
A-A
Floor
Runner
Ceiling
Runner
Notched Piece
Bent Down
Metal Stud
Framing Shown
Ceiling
Runner
Detail
A-A
Floor
Runner
24 in. (610mm)
O.C. Max.
Figure 2A
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 Wallboard
Stud or Runner
Retaining
Angle
1 in. Min.
Damper
Sleeve
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 Wallboard
Stud or Runner
Retaining
Angle
1 in. Min.
Damper
Sleeve
Figure 3 (2 sided angle installation shown)
Figure 4 (2 sided angle installation shown)
Curtain Fire Dampers
3
®
