Datasheet

Product Data Sheet 9956MR
01/31/2019 page 7 of 9
3.4 Sound Data
Measurement
conditions:
Sound pressure level: 1 meter distance between microphone and the air intake.
Sound power level: Acc. to DIN 45635 part 38 (ISO 10302)Sound power level: Acc. to DIN
45635 part 38 (ISO 10302)
Measured in a semianchoic chamber with a background noise level of Lp(A) < 5 dB(A)
For further measurement conditions see chapter aerodynamics.
a.) Operation condition:
2.250 1/min at free air flow Frequency: 50 Hz
Optimal operating point 74,0 m3/h @ 12 Pa
Sound power level at the optimal operating
point
4,7 bel(A)
Sound pressure level at free air flow,
measured in rubber bands
37,0 dB(A)
b.) Operation condition:
2.450 1/min at free air flow Frequency: 60 Hz
Optimal operating point 70,0 m3/h @ 15 Pa
Sound power level at the optimal operating
point
4,9 bel(A)
Sound pressure level at free air flow,
measured in rubber bands
40,0 dB(A)
4 Environment
4.1 General
Min. permitted ambient temperature TU min.
-40 °C / 50 Hz
-40 °C / 60 Hz
Max. permitted ambient temperature TU max.
80 °C / 50 Hz
80 °C / 60 Hz
Min. permitted storage temperature TL min. -40 °C
Max. permitted storage temperature TL max. 80 °C
4.2 Climatic Requirements*)
Humidity requirements humid heat, cyclic; according to DIN EN 60068-2-30,
6 cycle
Water exposure None
Dust requirements Dust check; according to DIN EN 60068-2-68,
6g/m2d, 1 day
Salt fog requirements None
Permitted application area:
The product is for the use in sheltered rooms with limited controlled temperature. Occasionally condensed water is
allowed. Direct exposure to water must be avoided. Saline ambient conditions must be avoided.
Pollution degree 2 (according DIN EN 60664-1)
It occurs only non-conductive pollution. Occassionally, temporary conductivity caused by condensation occurs.