Greenheck Multi-blade Fire & Combination Fire Smoke Dampers Installation Booklet (826249) - Manual (Page 45)

“Duct Continues”
Horizontal or Vertical Mount
Figure 1: Installation configurations for Grille access combination fire smoke dampers.
“Duct Terminates” Metal Stud
Vertical Mount
3/4 in. 14 ga.
Flange
#10 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
grille assembly.
Grille
(supplied
by others)
Combination Fire
Smoke Damper
3 1/2 in.
Max.
Thermal Blanket
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.
3. DUCT TO SLEEVE CONNECTIONS
Dampers are supplied with actuators (on applicable
models) and sleeves from the factory and can be
installed without the need for additional field installed
sleeves.
Sleeve gauges of 16 or 14 (1.5mm - 2mm) are to be
used. UL Standard 555 requires all ducts to terminate at
fire damper sleeves. Sleeve thickness must not be less
than the gauge of the connecting duct.
Duct to sleeve breakaway connections must be of the
type described on page 10. Factory furnished round
duct collars on type R and CR dampers are also
considered to be breakaway connections and may be
used.
Factory Supplied
Thermal Blanket
3 1/2 in.
Max.
Combination fire
smoke damper
Masonry
floor
4. SECURING THE DAMPER/SLEEVE ASSEMBLY TO
WALL OPENINGS.
Damper/sleeve assemblies must be installed in wall
openings using flanges and sheet metal screws as
illustrated and described below.
• Flange on front (grille end) of sleeve must be a minimum
of 14 gauge (2mm) steel and have a 3/4 in. (19mm)
minimum flange leg (refer to Figure 2). Using #10
(19mm) sheet metal screws, screw from inside of sleeve
through the rear portion of the studs (as shown in
Figure 1). Space screws a maximum of 6 in. (152mm)
on center and a maximum of 2 in. (51mm) from the
corners (minimum of 2 screws per side). No retaining
angles are required on the side of wall opposite from the
grille.
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