Point: 2.1 Does the FAQ on the ventilation conductance for compact ventilation units for point 2.1 of the 2011 OIB Guide also apply to the 2015 edition?

No, as the FAQ was only intended as a transitional regulation and in the meantime the testing of compact ventilation units has to follow the rules of EN 13141-7.

Irrespective of this, the old discount factors for existing buildings can continue to be used for existing energy performance certificates without any changes.