Table 1.

Exhaled air dispersion according with modalities and interfaces.43, 44, 45, 46

Interfaces and pressures (in cmH20)	Maximum exhaled air distance (in meters)
ResMed Ultra Mirage mask IPAP/EPAP cmH2O
10/4	0.40
14/4	0.42
18/4	0.45
ResMed Quattro Air mask (with anti-asphixia valve closed)
CPAP 10–20 cmH20	Negligible
Respironics Total Face IPAP/EPAP cmH20
10/5	0.61
18/5	0.81
Helmet StarMed CaStar R IPAP/EPAP cmH20
IPAP from 12 to 20/EPAP 5	Negligible

Abbreviations: CPAP, continuous positive airway pressure; IPAP, inspiratory positive airway pressure; EPAP, expiratory positive airway pressure.