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REMKO MWL series
MLG 70 ventilation unit module
Every property that is renovated and newly built nowadays should be constructed as "airtight" as possible
according to today's energy saving regulations. Consequently, modern building envelopes facilitate mould
growth within the living spaces more easily if ventilation is inadequate, thus endangering the fabric of the
building in the long term. The MLG 70 central ventilation module integrated in the MWL 35 regulates the
moisture protection according to demand and thus operates as "controlled living space ventilation" according
to demand depending on the relative humidity of the exhaust air.
With this system, moisture protection is based on the lowest possible air exchange, i.e. when moisture
actually occurs or the relative humidity in the living unit rises above a certain value. In this case, the fans of
the MLG 70 modulate to a higher speed. The module provides regular intermittent/pulsating minimum air cir-
culation beforehand to check the moisture in the room air/exhaust air.
In summary, the MLG 70 ventilation module was developed to be relatively small, space-saving, quiet and to
prevent possible mould formation. Furthermore, a cross-flow heat exchanger was installed, which achieves a
recuperative heat recovery of 88.5 %.
Describing the path of the air flow, first the outside air (fresh air) is drawn in by the outside air fan of the MLG
70 and thus directed into the ventilation module. Here, the system absorbs the existing heat from the
exhaust air (from the kitchen and bathroom) through the built-in cross-flow heat exchanger and then directs
the heated supply air into the living rooms and bedrooms. The drawing represents a small (required) over-
flow made possible by small air outlets (e.g. door slots) in the flat. The air is extracted directly from the
kitchen and bathroom, i.e. from the rooms where higher humidity tends to prevail and is caused. The path of
the extracted air (exhaust air) is again via the cross-flow heat exchanger, in which there are two separate
chambers - so there is no short-circuit here in terms of air technology. The exhaust air is then returned to the
outside air as cooled outgoing air.
Due to the possible strong cooling of the warm humid exhaust air, condensate may form inside the ventila-
tion module. The condensate collects in the condensate tray integrated there and is fed into the main con-
densate tray of the MWL via a pre-installed condensate drainage line. This is previously routed to the house
drain on site, e.g. via a funnel siphon.
A slight overpressure is created in the living rooms and bedrooms by supplying "fresh" air. The excess pres-
sure causes the air to flow through air outlets installed on site or slots in the door into the remaining rooms
(kitchen, bathroom and utility room). There, the existing humid room air is simultaneously extracted and thus
a certain under-pressure is created. Consequently, the overflow takes place through the physical balancing
of over and under-pressure within the living unit. This process usually describes the common operation of
ventilation units.
The air ducts are installed as round or flat ducts under or in the ceiling (connections 80mm). The duct
lengths must be selected so that the specified pressure drops are not exceeded in order to guarantee the
minimum air volume flow.
Changing the filter at the annual maintenance interval (with normal air quality) can be carried out particularly
quickly and easily thanks to the tool-free access. (see "Maintenance" chapter→ Changing the air filter).
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