ThermoFlo Neo HME. Specifications: Moisture at VT 20ml = 32.5mg H2O/L air at/VT 25ml = 31.0 H2O/L Resistanc at 7.5L/min = 0.35cm H2O at 15L/min 0.95cm H2O. Dead Space: 2.5ml. Weight 3 grams. Housing: Clear. Tidal Volume Range: 5ml - 50ml