20
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
ANCHOR PLATE (AP)
Anchor Supports are designed to provide support to vertical sections and provide fixed-
point support for horizontal sections. See
Figure 40
NOTE:
Rings installed at 90° to plates.
The Plate Support must be attached to the building structure or supported with rigid
structural members. See
Table 3
for maximum supported height.
A Plate Support is to be attached only to non-combustible construction such as block,
concrete or steel with clearance that is adequate for installation and access.
For maximum support, the entire perimeter of the Plate Support must be attached to
structural framing. Structural members are supplied by the installer.
Plate Support
Clamp Ring
PLATE AND WALL SUPPORT
Figure 40 - Anchor Plate
WARNING:
RISK OF FIRE - DO NOT ATTACH THE PLATE SUPPORT TO
COMBUSTIBLE CONSTRUCTION
Figure 41a - Anchor Plate on Framing
Figure 42 - Anchor Plate Horizontal Bracing
Supported duct sections subject to thermal expansion or in a vertical position must be
braced with diagonal members or gussets to prevent deflection of the supported joint
as shown in
Figure 42
.”X” is a minimum of 30°.
Figure 41b - Detail of Anchor Plate on Framing
Plate Supports are usually located adjacent to fittings, such as tees or elbows, to protect
fitting from expansion stresses.
Table 9
shows Plate Support, bracing and framework
requirements for duct size ranges.
NOTE:
If bracing is used, minimum ”X” angle is 30°. If there is no
bracing, the framework must be attached to structural members
to provide equivalent rigidity.
Duct Diameter
Ø (in)
Plate thickness
(in)
Bracing
(in)
Framework
(in)
Ø5 @ Ø22
3/16
2 x 2 x 3/16
Channel or
equivalent
2 x 2 x 1/4
Channel or
equivalent
Ø24 @ Ø36
1/4
3 x 3 x 1/4
Channel or
equivalent
3 x 3 x 1/4
Channel or
equivalent
TABLE 9 -
Minimum Acceptable Size for Framework and Bracing for all Models
Dimensions are in inches
