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

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 (see Figure 1, 2, & 2A).
• 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.
Floor Runner
Figure 1
Figure 2A
Wooden Stud Construction
Gypsum Wallboard
Figure 3 - Wood Stud
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)
Metal stud only
Stud or Runner
In wood stud construction,
gypsum wallboard must cover
all wood stud surfaces.
#10 sheet metal screws, 2 1/2
inches long, spaced 6 in. on center
and maximum of 2 in. from corners
(minimum of 2 screws per side).
Screw into rear portion of the studs
so as to avoid space conflicts with
the grille assembly.
Second set of studs are not required on openings
36 in. x 36 in. (914mm x 914mm) or smaller.
Metal stud only
Figure 2
Steel stud
Flange
Figure 4 - Metal Stud
Out of Wall Fire and Combination Fire Smoke Dampers
#10 2 1/2 in. long sheet metal
screws spaced 6 in. on center and
maximum of 2 in. from the corners
(minimum of 2 screws per side)
through the sleeve into the header,
sill and jamb framing members.
Screw into rear portion of the
studs so as to avoid space
conflicts with the grille assembly.
3