Section 4 – Installation
Key to Figure 4.4 (above) :
1 Fresh air (outside air being drawn in)
NOTE!
Connecting exhaust hoods or vented dryers
to the ventilation unit is not permitted! We
recommend using exhaust hoods with
recirculation and condensation dryers.
2 Supply air (air going into the rooms)
3 Extract air (air extracted from the rooms)
4 Exhaust air (air going into outside space)
The Fresh air (1) & Exhaust air (4) ducts connect ventilation unit to the outer wall screens or ceiling hoods.
The Supply air (2) & Extract air (3) ducts connect ventilation unit to required room grilles, diffusers, dampers.
The ducting should be routed from a distributor, without branching, star-like to its required room.
NOTE!
The air-duct system must be dimensioned and designed in accordance with the requirements of the
building and the ventilation unit chosen (see Section "2.4 System design"). An incorrectly specified
system can lead to insufficient ventilation and can cause high noise levels and an excessive energy
consumption. Any applicable guidelines and regulations must be observed and complied with.
4.4.1 Thermal insulation
The ventilation unit must be installed within the warm space of the building.
Ducts installed in cold spaces must be adequately insulated.
WARNING:
The unit, air diffuser and air-duct system must be installed inside the building.
Connections at both ends of the fresh-air and exhaust-air ducts must be airtight and
covered with thermal insulation over the entire route. (To prevent condensation).
Any ducting that runs through unheated areas must also be fitted with thermal insulation,
in order to prevent heat loss.
4.4.2 Vibration isolation and sound insulation
The final connection to the unit must use flexible ducting to isolate any vibration noise getting into the
system.
If required, suitable silencers/attenuators should be used at appropriate positions in the duct system.
(This may also include suitable sound absorbing suspensions, clamps, brackets or other duct fittings).
Ducting passing through walls or ceilings should be “sealed in” using a suitable material.
Sound travelling through the ducting from one room to another is reduced when a radial duct system is
used.
4.4.3 Air inlets and outlets
Fresh air is drawn in and exhaust air goes out through exterior-wall grilles and/or roof cowls.
The Fresh air is generally cool, dry and free of odours.
The Fresh air draw in point should be at least 1.5 m above ground level if possible.
The Exhaust air point should be positioned far away from the Fresh air inlet. (So that exhaust air does not
accidentally get drawn in to the fresh air intake).
Air inlets and outlets should be positioned in each room so that there is a good air flow through the room.
Position supply grilles so that they avoid direct drafts onto seats, chairs and beds, etc.
For unhindered air flow, areas such as hallways and corridors may require undercut doors or transfer
grilles.
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