Clearances Requirements - Greenheck ODFD Series Installation, Operation And Maintenance Instructions

1. DAMPER IS INSTALLED OUTSIDE OF WALL PLANE
OFSD-XXX
Figure 1 shows two approved installations for
combination fire smoke dampers: 1) "Through the
grille access" and 2) installation in continuing duct.
To provide "through the grille" access to the damper
actuator, the damper is located toward the back of the
sleeve and the actuator is installed between the damper
and grille. Actuator and damper can be accessed and
serviced by removing the grille. To provide access to the
damper actuator for continuing ductwork, refer to the
requirements of NFPA 90A.
Steel stud
Flange
Factory Supplied
Thermal Blanket
Grille
(Supplied
by others)
Damper
7 1/2 in.
Max.
"Duct Terminates" Metal Stud
Note: Both installations for vertical mount.
Figure 1: Installation configurations for 'Out of Wall' combination fire smoke dampers.
ODFD-XXX, OFD-XXX, and OSSFD-XXX: Figure 2
shows installations that are also approved for curtain fire
dampers. For access to inspect the damper and fusible
link, refer to the requirements of NFPA 90A.
Factory Supplied
Thermal Blanket
Grille
(Supplied
by others)
7 1/2 in.
Max.
#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.
Factory Supplied
Thermal Blanket
Grille
(Supplied
by others)
7 1/2 in.
Max.
Masonry
floor
Damper
the header, sill and jamb framing
members. Screw into rear
portion of the studs so as to
avoid space conflicts with the
grille assembly.
Factory Supplied
Thermal Blanket
Damper
"Duct Continues"
Horizontal or Vertical Mount
Gypsum Wallboard
Wooden Stud Construction
Factory Supplied
Thermal Blanket
Fire damper or
6 1/2 in.
combination fire
Max.
smoke damper
"Duct Terminates" Wood Stud
(Duct Terminates)
2. CLEARANCE REQUIREMENTS
There is no minimum clearance requirement between
the wall/floor opening and the sleeve exterior (with
thermal blanket attached). However, to facilitate
installation, clearances between the wall/floor opening
and the damper sleeve are recommended. although
there is no maximum allowable clearance, the minimum
overlap requirements between the wall/floor and the
flange/retaining angle must be met. On grill mount
installations the flange must overlap the wall/floor by
1/2 in. (13mm). On continuous duct installations, the
retaining angles must overlap the wall/floor by 1 in.
(25mm). Because no clearances are required between
the wall/floor opening and the sleeve, dampers may not
be installed in the plane of the wall using this installation
method.
7 1/2 in.
Max.
Masonry
floor
Damper
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
Retaining Angle
studs so as to avoid
(Refer to section 4)
space conflicts with
the grille assembly.
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