Hired-Hand External Damper Fans - Manual (Page 9)

Part No. 4801-5402 Rev. 2/09 Mega-Flow External Damper Fans & Cone Page 9 of 13
Top and Bottom bolts are
inserted from inside the
cone.
Slanting the
ring allows
gravity to
assists the
doors to shut.
Damper Door
Springs are to
be located at
the bottom of
the cone.
16.
Mount the Damper Ring. The ring is mounted in the holes
closest to the orifice on the top and farthest away from the
orifice in the bottom. Use ¼-20x1" bolts, nuts and washers
(provided) to attach ring to cone. Washers go on outside of
cone. The Door Springs that assist the Damper Doors to
close are oriented to the bottom. See Figures 8 and 9.
Figure 7: Mount Cone onto Fan
Figure 8: Mount the Ring Assembly
CAUTION: Fan Ring
must be plumb and
level in order for
doors to operate
properly.
Upper cone ring fits into
inner hole.
NOTE:
Fan Not Shown For
Clarity.
Figure 9: Side View of Cone
NOTE: Check the ring mounting from the side of
the fan. The ring is slanted to allow the force of
gravity to assist in closing the damper doors.
Inner hole
will be
capped in a
later step.
NOTE: Lower cone ring
fits into outer hole.