Medisize Ulti*Mist HME/F with CO2 Port, used for anesthesia and critical care. Connections: 15/22mm I.D./O.D. x 22/15mm I.D./O.D. Resistance (@.5I/s): 1.2. Moisture Efficiency in mg H2O/L: 32 @ 1000ml Vt. Media Salt: CaCl2. Dead Space: 55.0ml. Vt range: 150-1500ml. VFE/VFE: >99.99%/>99.99%. Latex-free, chlorhexidine-free, and lithium chloride-free. Packaging: 50/case.