Figure 6: Field attachment of fire dampers to sleeves.
Securing the Damper/Sleeve Assembly to Wall/Floor Openings
Attachments--Do not place attachments between blade channels
Blade
Channel
2 in. Max.
6 in. Max.
Attachments can be
staggered or evenly
spaced.
NOTE: Attachments must not enter blade
channel or they may cause interference with
blade closure. Narrow Line and Ultra Thin
dampers do not have flange for attachments
and must be welded to sleeve.
All fire and combination fire smoke dampers may utilize the two sided angle installation method described below.
1
1
⁄
2
hour rated fire and combination fire smoke dampers may use the single sided angle installation method up to the
following maximum sizes:
• Vertical mount: 80 in. W x 50. in. H (2032 mm W x 1270 mm H), 50 in. W x 80 in. H
(1270 mm W x 2032 mm H), or 40 in. W x 100 in. H (1016 mm W x 2540 mm).
• Horizontal mount: 144 in. W x 96 in. H (3658 mm W x 2438 mm H)
Retaining Angle Gauge
: Retaining angles for 1½ hour rated dampers with a width and height 48 in. (1219 mm) or
less must be a minimum of 20 ga. (1 mm). Retaining angles for all 3 hour rated dampers and all dampers with a width
or height greater than 48 in. (1219 mm) must be a minimum of 16 ga. (1.5 mm).
Retaining Angle Size:
The leg of the retaining angle on the damper sleeve shall be a minimum of 11/4 in. (32 mm).
The leg of the retaining angle on the wall/floor shall be long enough to cover the annular space and overlap the wall/
floor by a minimum of 1 in. (25 mm).
Retaining Angle Attachment to Sleeve:
Retaining angles must be attached to the damper using one or more of the
following methods of attachment (refer to label on outside of sleeve for ‘No Screw’ area):
- Tack or spot welds
- #10 (
3
⁄
4
in. [19 mm] max.) sheet metal screws
-
1
⁄
4
in. (6 mm) bolts and nuts
-
3
⁄
16
in. (5 mm) steel pop rivets
A minimum of two connections per side, top, and bottom, spaced
12 in. (305 mm) on center (O.C.) maximum are required for
openings of 48 in. W x 36 in. H (1219 mm x 914 mm) and less.
Dampers greater than 48 in. wide (1219 mm) or 36 in. high (914
mm) require the connections to be no more than 6 in. (152 mm)
on center.
The angles must be attached to all 4 sides of the sleeve. Ensure
that fasteners do not interfere with the operation of the damper.
The angles need not be attached to each other at the corners.
Retaining Angle Attachment to Wall/Floor:
Two-Sided Angle Method:
For two-sided angle installations the
retaining angles shall not be attached to the wall/floor (
see
Figure 7
).
2 in
. Max.
6 in. or
12 in. max.
Sleeve
Retaining
Angle
Damper
Duct
Min. 1 in.
Overlap
Wall or
Floor
Retaining
Angle
2 in
. Max.
6 in. or
12 in. max.
Figure 7:
Two-sided angle installation method
Curtain Fire Dampers
6
®
