ECO bi-flow evaporator used BT with two fans Ø30cm DFE 57-7 with 7mm fin pitch mod. DFE 57-7 158X85cm h28cm yields: low speed at room temp. 0°C delta 5° 1.88kW. yield at room temp. -20°C delta 7° 2.38kW. high speed at room temp. 0°C delta 5° 2.24kW. yield at room temp. -20°C delta 7° 2.83kW.