FAN ROTATION
Fan rotation is toward the cutoff point or clockwise viewed from the pulley end of the blower shaft
(Fig. 4).
PULLEY ALIGNMENT
Proper pulley alignment is necessary to prevent
excess wear of the fan belt and pulleys. To adjust,
remove the two 1/4" bolts from the tapered hub
bushing. Thread them into the two threaded openings
to separate the hub from the pulley. Move the hub in
the direction necessary to align the pulley. Remove
the bolts and place them through the holes in the hub
and into the threaded holes in the pulley. Take up the
slack and tighten the bolts to relock the pulley to the
shaft. Use the straightedge to check alignment (Fig.
5). Repeat the adjustment process as required.
The unit requires a minimum of six (6) points of support that are three inches square and elevate
the door side three (3) inches from the surface to provide door latch clearance. The mounts should
be positioned at each of the four corners and two to support the joint of the unit halves. Support
beams or pads must be located three (3) inches away from the bottom to allow operation of the
bottom door latches. If 4"x4" timers are used be sure that they are both long enough to support the
weight and oriented so as to transfer the weight of the unit to the underlying support structure. If
attachment to the support structure is required, the floor or back side may be field drilled for bolts
or screws. Seal all penetrations with silicone rubber or butyl rubber to avoid water and air leaks.
Take care to place bolts where they will not interfere with filter insertion or removal. The standard
unit is NOT designed to be stacked two high or mounted vertically. Contact the factory for special
mounting requirements.
7
INSTALLATION
PULLEY ALIGNMENT
Fig. 5
MOUNTING
!
!
Take note of the units weight and the maximum safe static load that
the mounting location will support. The blower end of the unit may
be heavier than the filter end. For roof mounting, add the expected
snow and ice load to the unit weight in order to arrive at a safe load
requirement.
Keep loose objects out of the blower and filter housing. Loose
objects pulled into the blower can cause the mechanical failure of
the blower wheel and result in severe injury to persons in the
discharge path.
