3-2
(2) Ensure that the hanging bolts are strong enough to sustain the load (in terms of the strength of
the bolt itself as well as the embedded condition).
(3) After the fan is installed, lock the nuts on the hanging bolts to prevent them from coming loose.
3.5
Precautions for connecting the duct
Caution
Ensure that the weight of the duct is not applied to the fan.
Otherwise, it may lead to malfunctions, damage, or vibration.
(1) Connect the duct to the flange of the fan through taping or expansion joints, and provide support
to the duct.
(2) Before connecting the duct, check the inside of the duct and fan and remove any foreign objects
such as waste cloth and tools.
Warning
If the air intake of the fan is opened, be sure to install a protective wire
mesh on it.
(3) To prevent foreign matter from being sucked in, install a protective wire mesh at the duct inlet or
the air intake of fan where atmospheric air is directly sucked. If dust or waterdrops are expected
to get into the fan, be sure to install a filter to block the entry.
Caution
Install the duct so that it makes a downward slope toward the outdoor
side.
(4) If the slope of the duct is insufficient, the rainwater may get into the room and get the household
goods or other items wet. It is recommended to install a (commercially available) weather cover
outdoors.
(5) Do not run the duct in the following ways. Such duct work may cause insufficient flow rate and/or
abnormal noise.
■
Sharp bends
■
Many bends
■
Bends near the blowout
or air intake port
■
Restriction of flow
Double nuts
