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Mechanical assembly
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3.3.2 Airflow determination
The airflow can be determined on the basis of the pressure difference across the fan
(∆
P
) and the fan’s calculation constant (
K
).
Pressure difference is calculated in
Pascal
(
Pa
) and using the equation shown below, the
airflow (
q
) is determined in m
3
/h.
Example
: The airflow is calculated for a fan of the type ER/RH63C.
The analogue pressure difference is read as
700
Pa
and in the table shown
below, an ER/RH63C fan has a
K
value of
381
If the unit for airflow is desired to be in l/s, divide by 3.6.
3
5'
Example: Plenum fan
¨
P x K = q
700 Pa x 381 = 10.080 m
3
/h
Plenum fan
ZerAx® fan
Fan type
K value [m
3
/h]
Fan type
K value [m
3
/h]
RH/ER22C
47
AZN 500/350
692
RH/ER25C
60
AZN 560/350
913
RH/ER28C
75
AZN 630/350
1197
RH/ER31C
95
AZN 710/350
1558
RH/ER35C
121
AZN 800/350
2017
RH/ER40C
154
AZN 900/350
2593
RH/ER45C
197
AZN 1000/350
3240
RH/ER50C
252
RH/ER56C
308
RH/ER63C
381
RH/ER71C
490
RH/ER80C
620
RH/ER90C
789
RH/ER10C
999
RH/ER11C
1233
Summary of Contents for VEX5000 Series
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