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2188.88 to convert from m
q
q
k
dps
p
fan
p
away
For the fan types AZN and AZW with wire guards, the constant in table 3 must be reduced by
up to 10%. For these fan types without wire guards, the constant is used directly.
For the AZL with wire guards, the constant must be reduced by up to 20%. For this fan type
without wire guards, the constant must be reduced by 10%.
Free inlet cones are integrated on the AZL and is an accessory for the AZN and AZW.
The suction must be directly from the suction chamber.
Fans with low blade angles can make noise at high pressures, which affects the measurement.
Operation close to the stalling area produces poor results also.
6. Maintenance
In the following, please also see "Appendix - G. Checklists" on page 29.
Standard temperature
Smoke
ATEX and EX
Table 4. Maintenance intervals
1.The site operator may have set other test intervals. Smoke control fans and other fans, which run infrequently
or in case of emergencies, must be run tested every week, for example during normal operation.
2.The motor manufacturer's recommendations may call for shorter lubrication intervals. See section "6.6 Motors"
on page 16. Please note that fans with permanent magnet motors are lubricated for life.
3.Intervals for cleaning depend on the operating conditions and environment. See section "6.2 Cleaning" on page
15.
Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance
3
/s to CFM.
p fan
p away
Figure 10.Measurement of pressure
difference
=
k
dps
3
:
Air volume [m
/s]
:
A constant, see table 3.
Difference between p
:
[Pa]
:
Static pressure at fan inlet [Pa]
:
Static pressure away from fan [Pa]
Fan types
Bearing types
Sealed for life
Lubricated
—
—
Fan sizes Constant, k Fan sizes Constant, k
250/160
280/160
315/160
355/160
400/160
450/160
500/160
500/350
560/350
630/350
710/350
800/350
Table 3. Constants for calculation of air
and p
away
fan
Test and
1
inspection
6 months
Weekly +
6 months
0.0510
900/350
0.0694
1000/350
0.0917
1120/350
0.1183
1250/350
0.1502
1000/560
0.1894
1120/560
0.2343
1250/560
0.1921
1400/560
0.2537
1600/560
0.3324
1800/560
0.4329
2000/560
0.5603
volumes for ZerAx fans
Service and
Cleaning
3
2
lubrication
6 months
3 months
0.7204
0.9001
1.2019
1.5636
0.871
1.129
1.441
1.844
2.453
3.142
3.913
Bearings
3 months
14 of 30
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