Steel Stud
Flange
Flange
Flange
Factory
Supplied
Thermal
Blanket
7 1/2 in. (191mm) or
8 1/2 in. (216mm)
max.
Concrete or
Masonry
Wall
Wood
Stud
Damper
Type A- Vertical Mount, Duct Terminates
Flange Method
Type A - Horizontal Mount Below Floor/Wall, Duct
Terminates Flange Method
Flange
7 1/2 in. (191mm) or
8 1/2 in. (216mm) max.
Factory Supplied
Thermal Blanket
Masonry or
Concrete
Floor
Damper
Type A- Vertical Mount, Duct Terminates
Single Angle Method
Type A - Horizontal Mount Above Floor/Wall, Duct
Terminates Single Angle Method
Type A - Horizontal Mount Below Floor/Wall, Duct
Terminates Single Angle Method
7 1/2 in. (191mm) or
8 1/2 in. (216mm)
max.
Factory Supplied
Thermal Blanket
Retaining
Angle
Alternate
Retaining
Angle
Location
Concrete or
Masonry Wall
Wood
Stud
Steel Stud
Damper
7 1/2 in. (191mm)
or 8 1/2 in. (216mm) max.
Retaining
Angle
Factory Supplied
Thermal Blanket
Concrete or
Masonry
Floor
Damper
Retaining
Angle
Concrete or
Masonry
Floor
Damper
7 1/2 in. (191mm) or
8 1/2 in. (216mm) max.
Factory Supplied
Thermal Blanket
Approved installations for curtain fire dampers
1) Through the grille access and
2) Installation in continuing duct.
The following maximum distances outside the barrier
apply:
• Steel stud and masonry barriers:
- 8
1
⁄2 in. (216mm) provided the width and
height of the damper are both 24 in.
(610mm) or less and the damper sleeve is
20 gauge
- 7
1
⁄2 in. (191mm) in all other instances
• Wood stud walls: 6
1
⁄2 in. (165mm)
For access to inspect the damper and fusible link, refer
to the requirements of NFPA 90A.
®
ODFD OFD Installation Drawings 1
Document 481329
ODFD-XXX and OFD-XXX Series
Installation Drawings