Preparation Of Openings - Greenheck DFDR 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. (305 mm) 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.
24 in. o.c.
Maximum
(metal studs)
12 in.
24 in. o.c.
Maximum
16 in. o.c.
Maximum
(wood studs)
Floor Runner
Figure 1
Figure 2A
®
24 in. o.c.
Ceiling Runner
Maximum
(metal studs)
2 in.
2 Panhead
Screws
2 in.
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.
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
Figure 2
Round Fire and Combination Fire Smoke Dampers 3