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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.
24 in. o.c.
Maximum
(metal studs)
12 in.
24 in. o.c.
Maximum
16 in. o.c.
Maximum
(wood studs)
Floor Runner
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
24 in. (610mm)
O.C. Max.
®
24 in. o.c.
Ceiling Runner
Maximum
(metal studs)
2 in.
2 panhead
screws
2 in.
16 in. o.c.
Maximum
(wood studs)
Figure 1
Detail
A-A
Figure 2A
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
Ceiling
Runner
Floor
Runner
Figure 2
GFSD Series
3
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