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L1023004-D 14.07.2017
User manual
Duco's ventilation systems
L1023004-D
1A. Ventilation system operation
A Duco Demand-Controlled Natural Ventilation System (DCNVS) is a ventilation system that provides healthy air quality
automatically*. Sensor readings ensure that the building is ventilated only when it is required (= demand controlled). This
ventilation system operates on the system C principle, which means that polluted air is extracted mechanically (using a
central extract unit) and fresh air is supplied naturally via window ventilators.
Depending on the components installed, your ventilation system will:
→ Maintain CO
2
at an appropriate level
Excessively high CO
2
concentration is unhealthy and results in problems including lack of concentration and health is-
sues such as headaches and lack of sleep at night. CO
2
accumulates particularly when many people gather in one room.
As standard, ventilation operates only until the CO
2
(standard) concentration has dropped below 800 ppm (parts per mil-
lion) and remains below that level. By way of comparison: the CO
2
level of the air outdoors is between 350 and 450 ppm.
→ Maintain humidity at an appropriate level
Excessively high humidity can lead to moisture accumulation or mould growth and health issues such as eye, nose, and
respiratory tract problems. The ventilation system is geared (as standard) to 60% relative humidity, the optimum.
→ Exhaust unpleasant odours
Using presence detection in a toilet for instance, the ventilation system ensures that rooms smell fresh by exhausting
polluted air.
Summing up, your Duco ventilation system ensures a healthy as well as comfortable indoor climate.
* Exception: Duco C System
Duco C System
All Duco Demand-Controlled Natural Ventilation Systems feature an automatic setting which is controlled by one
or more sensors. A Duco C System does not include any sensors and hence no automatic setting, which means
the system requires wholly manual operation.
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Introduction
