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partial rebreather mask

par·tial re·breath·er mask

/pahr shuhl rēbrēth′ər mask, mahsk/

Noun

An oxygen delivery device in which a flap valve is removed from one of the side ports, which allows atmospheric air to pass into the mask in case oxygen abruptly stops flowing. It delivers less oxygen than an NRB mask, approximately 60%, inspired oxygen at a liter flow of 10 to 15 lpm.