Round Fire and Combination Fire Smoke Dampers
3
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.
• 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
2 Panhead
Screws
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.
Figure 2
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 2A
