Greenheck FD 150 Series Installation Instructions page 4

Recommended Preparation of Openings in Wood and Metal Stud Walls
- Frame wall openings as shown in Figure 7.
- Double vertical studs are not required for openings 36" x 36" or smaller.
- Gypsum wall board must be fastened 12" on center to all stud and runner flanges surrounding opening (see Figure 8).
- All construction and fasteners must meet the requirements of the appropriate wall design. (See UL Fire
Resistance Directory)
Figure 7: Preparation detail for opening in stud wall.
Metal Stud Construction
Gypsum Wallboard
Retaining
Angle
In metal stud construction,
Damper
exposed steel surfaces need
Sleeve
not be covered with gypsum
wallboard.
Figure 8: Detail of retaining angles and gypsum board application for metal and wooden stud construction.
"UL CLASSIFIED (see complete marking on product)"
"UL CLASSIFIED to Canadian safety standards (see
complete marking on product)"
Standard 555 (Listing #R13317)
24" o.c.
Maximum
(metal studs)
12"
24"
O.C.
Maximum
16" o.c.
Maximum
(wood studs)
Floor Runner
Stud or Runner
1" Min.
24" o.c.
Ceiling Runner
Maximum
(metal studs)
2"
2 Panhead
Screws
2"
16" o.c.
Maximum
(wood studs)
Wooden Stud Construction
Gypsum Wallboard
Retaining
Angle
In wood stud construction,
Damper
gypsum wallboard must cover
Sleeve
all wood stud surfaces.
S S
C
® ®
Stud or Runner
1" Min.
IOM-FD/DFD-150X Series FS
Rev. 4
February 1999