10
When θ exceeds 7°
Wrong
When straight duct is installed
Correct
When bellmouth is attached to
reduce local resistance
Correct
When local resistance becomes
excessive
Wrong
When rectangular bend section
is near to suction port.
Wrong
Attaching vanes at
rectangular bend section
Correct
When bend section is
near to discharge port
Wrong
Attaching vanes at bend or
rectangular bend section
Correct
5D or more
（D means fan
When vanes of opposite
direction to impeller are
attached near to
discharge port
Wrong
When vanes of same
direction to impeller are
attached near to
discharge port
Correct
When the suction air makes
opposite direction of whirl to
impeller
Wrong
Attaching vanes to prevent
suction air from whirling
Correct
Wrong
Correct
Fig-3 Sample piping method
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