Connecting Air Ducts - Wolf CWL-2-325 Installation And Operating Instructions Manual

Installation
5.4

Connecting air ducts

All air ducts must be installed airtight. The collars on the CWL appliance are provided as standard with
sealing rings.
In order to prevent condensation on the outside of the outdoor air supply duct and the air exhaust duct
from the CWL appliance, these ducts have to be provided with an external vapor barrier as far as the
appliance. If thermally insulated piping is used here, additional insulation is not necessary.
For compliance with the maximum installation noise level of 30 dB(A), it will have to be assessed for
every installation what measures will be required to limit the noise. In order to optimally dampen the noise
of the fans from and to the dwelling through the duct, at least mufflers of no less than 1 m are required,
but additional measures may be necessary.
Prevent crosstalk through the air supply and discharge ducts by using separate branches to the diffusers.
If necessary, the supply ducts must be insulated, for instance when they are installed outside the
insulated envelope.
The outside air supply should be arranged from the shadowed side of the dwelling, preferably from the
wall or an overhang.
The discharge duct must be fed through the roof boarding in such a way that no condensation forms in
the roof boarding.
The discharge duct between the CWL appliance and the roof sleeve should be such that surface
condensation is prevented.
Always use an insulated ventilation roof sleeve.
In order to keep the noise levels down, it is recommended to restrict the external duct pressure to 100 Pa.
If the resistance of the duct system is higher than the maximum curve of the ventilator, the maximum
ventilation capacity will be lower.
The air speeds must be limited to a max. of 5 m/s in the main ducts and 3.5 m/s in the branches.
The location of the discharge of the mechanical ventilation air and the sewer stack vent must be chosen
to prevent noise nuisance.
The location of the input valves must be chosen in such a way to prevent fouling and drafts. We
recommend using input valves.
When using flexible mufflers, account must be taken during the installation that these may need to be
replaced after a period of time.
Install sufficient overflow openings, door gap 2 cm.
14 | WOLF GmbH
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7100832_202010