16 - EN
5.5 Air ducts
Legend
Code
Decription
ODA
Outdoor air
SUP
Supply air
ETA
Extract air
EHA
Exhaust air
SU
P
O
DA
E
TA
EH
A
SU
P
The following must be taken into account when
fitting the air ducts:
■
The distance (E) between the opening of the
supply duct (A) and the opening of the extraction
duct (B) must be at least 1.5 m;
■
The position of the supply opening (A) relative
to other possible sources of stale air is very
important (other exhaust-air outlets, street versus
garden, etc.);
■
The exhaust duct should drain (D) in the direction
of the unit.
5.5.1 Top air ducts
The unit’s top air duct openings can only be
connected using a connector from the Zehnder
ComfoPipe Plus air duct system. The following types
of connector may be used:
■
Right-handed connector;
■
Left-handed connector;
■
Vertical connector;
To fit the ComfoPipe Plus connector to the unit, refer
to the instructions supplied with the connector.
5.5.2 Bottom supply air duct
At the bottom the unit is equipped with an optional
Ø125mm supply air duct. The supply air fan needs
to be rotated and the top supply air duct must be
closed off when the bottom supply air duct is used.
The top supply air duct can be closed off with a
ComfoPipe Plus Wall feed-through set.
The following aspects must be taken into account,
while installing the bottom air supply duct:
■
To prevent unnecessary temperature loss in either
the summer or the winter, we recommend fitting
thermal and damp-proof insulation to the supply
duct from the unit up to the supply valves;
■
Install the air duct with a minimum ø of 125mm, as
little air resistance as possible and free from air
leakage;
■
Make sure the inside of the air ducts do not have
an obstruction of any sort. Air ducts must not
have sharp bends, dents or long screws inside.
Obstructions will compromise the performance
and maintenance of the system;
■
Install a silencer of at least 1m straight directly
onto the supply air connection. For relevant
advice, please contact Zehnder;
■
When using a flexible channel only Zehnder
channel systems may be used. Any other flexible
channel will disturb the basic operating principle
of the balanced ventilation system.
