Nonrebreathing reservoir mask
Exception - one-way valve at the exit of the reservoir bag.
Enabling delivery of 100% oxygen
One-way valves on its side ports to minimize the inhalation of ambient air.
Maximum FiO2 upto 90%
good temporizing measure in an acutely hypoxemic patient

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Disadvantage
Typically, these masks provide a FiO2 may be even lower (0.60–0.8) in the setting of very high minute ventilation/ respiratory distress
Mask tightly sealed on face
Risk of CO2 retention if oxygen flow dysfunction
Amount of O2 cannot be titrated to target O2 saturation and could theoretically expose patients to hyperoxia

Use of NRBM

Carbon monoxide poisoning
Smoke inhalation
Chronic airway limitation
Cluster Headache
Patients who require high-concentration oxygen, but do not require breathing assistance.
Claustrophobia