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Backdraft Damper Orientation Note
The ideal orientation of unit’s backdraft damper is level
within the framing. If necessary, however, the damper
can be installed at a slight angle within the following
constraints:
As shown in Figure 5 at right, the damper has two distinct
axes: The “Y” axis about which its doors open; and the “X”
axis perpendicular thereto.
As shown in Figures 6A and 6B, the damper can be in-
stalled with the “Y” axis at a slight angle. However, this
angle must NOT exceed 45° (as shown in Figure 6C).
The “X” axis must NEVER be installed at any angle (as
The “X” axis must NEVER be installed at any angle (as
shown in fi gures 7A and 7B). Installing the backdraft
shown in fi gures 7A and 7B). Installing the backdraft
damper outside of these constraints will prevent its doors
damper outside of these constraints will prevent its doors
from closing properly!
from closing properly!
FIGURE 5:
FIGURE 6A
FIGURE 6B
FIGURE 6C
FIGURE 7A
FIGURE 7B
Bottom side of backdraft damper
assembly (Gravity Doors)
P/N 780100500 05/19 Rev B
