Model DV-3V DV-4V DV-5V DV-7V DV-8V Frequency (Hz) 50 60 50 60 50 60 50 60 50 60 Air Capacity (L/min) 57 70 91 104 100 113 91 104 100 120 Ultimate Pressure (Torr) 90 80 90 80 90 80 90 80 90 80 Kpa (abs) 12 10.7 12 10.7 12 10.7 12 10.7 12 10.7 Pole 4 2 2 2 4 Phase ö 1 1 1 1 1 Voltage (Volt.) 220 110 220 110 220 110 220 110 220 110 Power (Watt) 250W 350W 400W 350W 400W Noise Level (dB) 56 58 62 65 58 60 62 65 60 62