enervent Fenix 120, Installation And Operation Instructions Manual, Page: 21 / 31

21
TO BE OBSERVED DURING OPERATION
Always ventilate with a high enough efficiency! Otherwise the indoor humidity will rise
too high and condensation will form on for instance cold window surfaces.
The recommended relative humidity for indoor air is 40 …45 % (room temperature
20...22 °C). At these levels condensation will not form and the humidity is at a healthy
level. By monitoring the humidity of the indoor air with a humidity sensor, the ventilation
can be increased when the humidity rises over 45%. Alternatively the ventilation can be
reduced if the humidity of the indoor air falls below 40%.
Change the filters often enough! During the winter time the extract air filter becomes
dirty more quickly than the fresh air filter. In this case the extract air flow will decrease,
which then leads to a rise in the humidity, and also the decline of the incoming air
temperature.
HEAT RECOVERY EFFICIENCY
ENERVENT FENIX
Heat recovery efficiency
50
55
60
65
70
30 40 50 60 70 80 90 100 110 120 130
Air flow l/s
η
%
Supply/exhaust air ratio 1.0 Supply/exhaust air ratio 0.85