3-3
3.4 Foundation
(1) The foundation must be strong enough to support the weight and the load and vibration
produced by the fan during operation.
(2) The foundation concrete should be constructed such that it keeps its levelness and is not
affected by ground subsidence. Reinforce the ground by piling if it is soft or weak.
(3) The weight of the foundation must be two to four times the total weight of the fan including
the motor.
(4) The unit’s foundation should be isolated from vibrations of the structure’s pillars or floor.
(5) When constructing foundations for two or more units, isolate one unit from another so as to
prevent the transmission of vibration.
(6) Foundation bolt should be secured using the installation method of a fan, in which, as a
standard, box voids are placed in the concrete foundation. Refer to the external dimensions
drawing for the positions for the foundation bolt holes.
When setting the foundation bolts before installing the fan, use a template to ensure that the
positions are correct.
(7) If the foundation is constructed on the second floor or higher, level the foundation with a
beam and keep it as close as possible to the walls.
3.5 Installation
3.5.1. Floor-mount type
The followings are the procedure for installing the foundation bolts (box void method).
(When foundation bolts are installed in advance, follow only the applicable instructions below.)
(1) Clean the foundation concrete surface and check the levelness. According to the site conditions,
chipping may be necessary.
(2) Clean the foundation bolt holes and remove any debris.
Although the foundation bolt holes must be wet, there must be no water in the holes. Remove
water.
(3) Set one flat liner and two tapered liners
on both sides of the fan foundation bolt
holes as shown in the figure.
If necessary, use auxiliary liners (at least
3 mm thick).
If there is a distance of more than one
meter between foundation bolts, also set
liners in that space.
(4) Place the fan base on the liners, and
insert the foundation bolts through
foundation bolt holes of the fan base into
the box voids.
To ensure resistance to earthquake, weld
the foundation bolts to the reinforcing iron bars of foundation concrete.
(5) Use the tapered liners to adjust the fan position and height.
As a guide, the levelness of the shaft should be within 0.1 mm per meter.
Fan base
Mortar finish
uxiliary
liner
Tapered
liner
Flat liner
Foundation concrete
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