8. Special
accessories
8.1 Damper
(1) Refer to the external dimensions drawing (supplied separately), and install the dampers in
place paying attention to the direction of the air flow.
(2) Open and close the damper to check that the vane does not come into contact with the
casing or ducts.
(3) If the damper is of an electric or air cylinder type, carefully read the instruction manual of the
actuator before use.
8.2 Expansion
joint
For the face-to-face dimension of the expansion joint, follow the external dimensions drawing. Do
not expand or compress the joint. Do not use the expansion joint to correct the misalignment
between the fan and duct.
8.3 Filter
Careful consideration must be given to the installation of the filter so that the fan can be
disassembled easily, for example by using short ducts.
Before installing the filter, thoroughly clean the inside of the fan and ducts. The filter tends to clog
easily immediately after the start of operation. Therefore, inspect the filter earlier than usual.
After that, periodically remove the filter element and wash it.
8-1
