Airflow (cmh) 23000 / 30000 / 40000 Voltage (V) B23 - 240V B23/B30/B40 - 415V Power (Watts) B23 - 1500W B30 - 3000W B40 - 3500W Fan Type Axial Fan Fan Speed B23/B30/B40 - Single Speed B23 - Multi Speed Size(cm) T23 - 120(L) x 120(W) x 98(H) T30 - 130(L) x 130(W) x 118(H) T40 - 130(L) x 130(W) x 118(H) Net Weight(kg) B23 - 55 B30 - 100 B40 - 120 Noise (dB) <78