I have ordered an E-EXTRA 150 mm single room ventilation system with heat recovery.
Unfortunately, the information on the noise level at level 1 (800 rpm) of 19 dbB/A is not correct.
Every time the direction of rotation is changed in stage 1, the motor starts up at approx. 1450 rpm instead of 800 rpm and thus reaches the noise level in stage 2, which means that the noise level is exceeded every 70 seconds to such an extent that the fan cannot be used in bedrooms.
I then complained about this condition and received the answer that it was normal for the speed to run up to level 1, which means that the statement in the technical data that the noise level is 19 dB/A at 800 rpm is untrue.
I can therefore only rate this item and the processing of my complaint as poor
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