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Installing Supplementary Fan Devices - Mitsubishi Electric Lossnay series Technical Manual

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11. Installing Supplementary Fan Devices

On occasions it may be necessary to install additional fans in the ductwork following LGH-type Lossnay units because of the
addition of extra components such as control dampers, high-efficiency filters, sound attenuators, etc. which create a significant
extra static pressure to the airflow. An example of such an installation is as shown below.
Static pressure generating component
SA
For such an installation, avoid undue stress on the fan motors. Referring to the diagrams below, Lossnay with extra fans should
be used at the point of left side from A.
Q-H for Lossnay Without Extra Fan
(Static pressure)
H
Lossnay
specification
curve
H
1
Additional fan
RA
Lossnay with static pressure
increasing component.
Lossnay without static
pressure increasing
component.
Q
Q
1
(Air volume)
CHAPTER 5
System Design Recommendations
Lossnay fan
Lossnay
Q-H for Lossnay With Extra Fan
(Static pressure)
H
H
+ H
1
2
Lossnay
specification
curve
H
1
H
2
Extra fan
specification
curve
Lossnay with
extra fan
Lossnay with static pressure
increasing component.
A
Q
Q
'
1
1
(Air volume)
EA
OA
Q
U-57

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