3-7
(4) If necessary, install a damper to control air volume.
When θ exceeds 7°
(Wrong)
Install straight air duct
(Correct)
When bend section is near the
discharge port
(Wrong)
Attach vanes at bend or
rectangular bend section
(Correct)
When local resistance
becomes excessive
(Wrong)
Install a bell mouth or the
like to reduce the local
resistance.
(Correct)
When rectangular bend
section is near the suction
port.
(Wrong)
Attach vanes at rectangular
bend section
(Correct)
When a vend is created in
the direction opposite to
impeller’s rotation near the
discharge port
(Wrong)
When a bend is created in the
direction same as impeller’s
rotation near the discharge port
(Correct)
When the suction air makes a
whirl in a direction opposite to
impeller’s rotation
(Wrong)
Attach vanes to prevent
suction air from whirling
(Correct)
(Wrong) (Correct)
Warning
Be sure to install a protective wire mesh on any open air intakes for
the fan.
(5) On the duct inlet or the air intake through which air is directly sucked, install a protective wire
mesh to prevent entry of any foreign matters.
(6) In the case of a turbo fan, if it is expected that dust or water droplets enter the fan, be sure to
install a filter to prevent them from entering the fan.
Note
If there is a wall in front of the fan, ensure that the gap between the intake
and the wall is larger than the diameter of the air intake of the fan.
Min. 1.5D
(D: Impeller Dia.)
To Next Page