Doors/Windows Are Difficult To Open - Viessmann VITODENS Operating Instructions Manual

Doors/windows are difficult to open

Cause
In highly airtight buildings, e.g. a passive house:
The air flow rates for supply and extract air in your ven-
tilation unit are out of balance.
Doors/windows bang when opened
Cause
In highly airtight buildings, e.g. a passive house:
The air flow rates for supply and extract air in your ven-
tilation unit are out of balance.
Remedy
Notify your heating contractor.
Remedy
Notify your heating contractor.
What to do if...
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