Airon's MACS is the most sophisticated and economical portable face mask CPAP system. The MACS demand flow system delivers CPAP without wasting oxygen, providing 45 minutes on a D cylinder. A calibrated knob sets the CPAP level up to 20 cm H2O and a switch selects 65% or 100% oxygen. MACS is compatible with CO2 monitors and medication nebulizers. MACS—built tough for EMS environments. Visit www.AironUSA.com.