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CHAPTER 5
System Design Recommendations
10. Installation of Supplementary Fan Devices After Lossnay
Unit
On occasions it may be necessary to install additional fans in the ductwork following the LGH type Lossnay. This is because of
the inclusion 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 care should be taken to avoid undue stress on the fan motors. Referring to the diagrams below, so
long as Q
'
Q
, there is no adverse effect on the motors. This is generally such in the majority of cases.
1
2
Q-H for Lossnay without extra fan
H
H
1
Q
1
64
RA
Lossnay with static pressure
increasing component.
Lossnay
Q Lossnay
Q
Additional fan
Lossnay fan
H
H
+ H
1
2
H
1
H
2
Lossnay
Q-H for Lossnay with extra fan
Lossnay with static pressure
increasing component.
Q
Q
'
2
1
EA
OA
Q
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