Dimensions and duct outletsFigure 1. Dimensions and duct outletsDuct outletsInner diameter of the outlet collar ∅ 125 mm.Supply air from the unit to the apartmentExtract air from the apartment to the unitExhaust air flowing outdoors from the unitOutdoor air to the unitHR cell support locationsSupply airExtract airCoarse filterFine filterUpper support of the cell