11
Fig. 11 Schematic diagram
the following formula is used:
Q = k .
P
Q = Air flow rate (m
3
/h)
k = Factor
P = Pressure read off (Pa)
K-factor:
L50
153
L30
97
L20
85
* The L12 and L18 have different fans, so the
calculation method is not the same.
example:
Unit L30
Required: 2500
m
3
/h
L30 has k-factor=97
Use formula: Q = k .
P
2500 = 97
P
2500 = 97 .
P
97
97
25.8 =
P
(25.8)
2
= P
P = 664
• Connect the pressure meter
• Adjust the fan until 664 Pa is
displayed on the instrument
You have now adjusted the L30 unit to
a capacity of 2500 m
3
/h.
7 Adjustment, Capacity and Sound Data
the units have separate pressure measurement outlets. they are labelled on the unit. the l20 and
l30 have outlets on the top of the unit, the l50 on the end.
Summary of Contents for L12 X
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