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5.3 Ducting
Flexible ducting should only be used for final connections with special care taken to avoid restrictions and
other conditions which will restrict air flow. When installing ducting, care should be taken to ensure it is
properly supported and secure with joints properly sealed. All ducting located in loft spaces and roof voids
etc., which are unheated, must be insulated, together with the duct runs from the unit to atmosphere.
If the air inlet from outside is less than 2 meters a frost protect pre-heater is recommended.
All ducting fitted to the spigots on the MVHR
should be secured via a suitable sealed duct
connector to prevent air leakage (e.g. Xpelair
CPC125
– 91485AA)
Duct spigots
5.3.1 Duct connections
For ease of installation the duct connections are located at the ends of the MVHR when viewed with the
condensate drains on left hand side:
Top left with Filter: Drawing in fresh air from the outside (Atmosphere Intake)
Top right with Filter :Extracting used air from the building (Dwelling Extract)
Bottom left: Extracting the used air out to atmosphere (Atmosphere Discharge)
Bottom right: Supplying the tempered fresh air into the building (Dwelling Supply)
