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Fire Dampers (Static & Dynamic)
Installation Instructions
4. Methods of Securing Damper in
Opening:
a. Two Angle (Two Sided) Method: This
method is the oldest and most commonly
used. This method is approved for use in UL
approved concrete/masonry partitions, steel
stud/gypsum walls, and wood stud/gypsum
walls. In this method 2 sets of angles are
used to secure the damper in the opening,
one on each side of the partition (See Fig. 7).
Two Angle Method is approved for 1
hour dampers, vertical or horizontal orienta-
tion, and any maximum size multi-section
UL approved damper (see Underwriter's
Laboratories Listings for maximum assem-
bly sizes). Angles shall be a minimum of
1
1
/
" x 1
1
/
" (38mm x 38mm) x 16 gauge.
2
2
Angles are to be fastened to the sleeve on
6" (152mm) centers with #10 (M5) sheet
metal screws,
/
" (5mm) steel pop rivets,
3
16
/
" (13mm) tack welds, or
/
1
1
2
ameter nut and bolts with not more than
2" (51mm) from each end with a minimum
of two connections per side/leg. The angles
are to overlap the partition a minimum of
1" (25mm). These angles may be of a unit
type construction and may or may not be
fastened to each other at the corners. When
the duct work terminates at the damper or
installation prohibits angles from turning out/
away from the wall, the retaining angle shall
be reversed (leg turned into the opening)
providing the size of the opening is increased
by an amount equal to twice the combined
thickness of the angle and the height of the
screw or bolthead to maintain expansion
clearances. See note 1A for information on
clearances. See Fig. 7 for detailed drawings
of installations.
b. One Angle (Single Sided) Method:
In this method 1 set of angles are used
to secure the damper in the opening. This
method is approved for use in UL approved
concrete/masonry partitions and steel stud/
gypsum walls. Only one side of the fire parti-
tion will have the angles installed (see Fig.
8). One Angle Method is approved for 1
hour dampers only, vertical and horizontal
(angles on top side only) orientations, and the
maximum size shall be 108" (2743mm) wide
or 108" (2743mm) high up to 36 square feet
(3.345 sq. meters) and up to the maximum
multi-section. UL approved damper size
(see Underwriter's Laboratories Listings for
maximum assembly sizes). Angle shall be a
minimum of 1
1
/
" x 1
1
/
" (38mm x 38mm) by
2
2
16 gauge. Angles are to be fastened to the
sleeve on 6" (152mm) centers with #10 (M5)
sheet metal screws,
/
" (5mm) steel pop
3
16
rivets,
/
" (13mm) tack welds, or
1
2
diameter nut and bolts with not more than
2" (51mm) from each end with a minimum
of two connections on each side/leg top and
bottom. The angles are also to be fastened to
the fire partition with: in concrete/masonry
partitions with #10 (M5) self-tapping concrete
anchors or concrete screws on 6" (152mm)
Jul / 06
245001 SHEET 2 OF 4
/
and 3
1
2
" (6mm) di-
4
centers and must engage the fire partition
a minimum of 1
gypsum partitions secure the angles to the
partition with #10 (M5) screws long enough
to penetrate the J-Runners and E-Stud by a
minimum of
3
of two fasteners per side. The angles are
to overlap the partition a minimum of 1"
(25mm). These angles may be of a unit type
construction and may or may not be fastened
to each other at the corners. When the duct
work terminates at the damper or installa-
tion prohibits angles from turning out/away
from the wall, the retaining angle shall be
reversed (leg turned into the opening) pro-
viding the size of the opening is increased
by an amount equal to twice the combined
thickness of the angle and the height of the
/
1
screw or bolt head to maintain expansion
2
clearances. Angles can be placed in front of
or behind the drywall attaching directly to
the steel studs or masonry. PRICE's Frame
Retaining Angles (FRA) can be used in place
of the angle mentioned above. See note 1B
for information on clearances. See Fig. 8 for
detailed drawings of installations.
c. No Angle Method: In this method No
angles are used to secure the damper in the
opening. This method is approved for use in
UL approved concrete/masonry partitions
and steel stud/gypsum walls. This method
/
" (6mm)
1
4
uses a minimum
one end of the sleeve. The damper/sleeve
assembly is placed in the opening so that the
flange rest flush up to the partition, then the
fasteners are placed through the sleeve into
the partition (see Fig. 9). No Angle Method is
approved for 1
All Metric dimensions ( ) are soft conversion.
Imperial dimensions are converted to metric and rounded to the nearest millimetre.
/
" (38mm); in steel stud/
1
2
/
" (10mm). Use a minimum
8
/
" (19mm) flange is on
3
4
/
hour dampers only, verti-
1
2
cal and horizontal (flange on top side only)
orientations, and the maximum size shall be
42" (1067mm) wide by 48" (1219mm) high up
to the maximum multi-section UL approved
damper size (see Underwriter's Laboratories
Listings for maximum assembly sizes). The
sleeve flange shall be a minimum of
(19mm) high by 20 gauge steel. If a flange/
angle is added, it shall be a minimum of
1" x 1" (25mm x 25mm) by 18 gauge steel
and fastened with #10 (M5) bolts or screws,
/
" (13mm) welds, or
/
" (5mm) rivets to
1
3
2
16
the sleeve, at a maximum spacing of 6"
(152mm) o.c., not more than 2" (51mm) from
each end with a minimum of two fasteners
per side. The sleeve is to be fastened to
the fire partition with: in concrete/masonry
partitions with #10 self-tapping concrete
anchors or concrete screws on 6" (152mm)
centers and must engage the fire partition
a minimum of 1
1
/
" (38mm); in steel stud/
2
gypsum partitions secure the angles to the
partition with #10 (M5) screws long enough
to penetrate the J-Runners and E-Stud by a
minimum of
/
" (10mm). Use a minimum
3
8
of two fasteners per side. The sleeve flange
can be placed in front of or behind the dry-
wall attaching directly to the steel studs or
masonry. Be sure to not stretch the damper
when securing it into the partition. Stretch-
ing the damper can cause it to bind up and
prevent it from operating properly. PRICE's
Frame Retaining Angles (FRA) can be used
in place of the angle mentioned above. See
note 1C for information on clearances. See
Fig. 9 for detailed drawings of installations.
© Copyright E.H. Price Limited 2006.
/
"
3
4
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