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[surabibio]

.1. The airway path from breathing bag to the mask should be offering least resistance possible.
2. The natural tendency of patient after putting on the mask is to inhale. Hence even if mask is open the breathing should get distended so patient can start with the first inhale. (this is the design in non-rebreather mask currently)
3. Venturi valve is a flow valve. I am sceptic how it might work in this pressured system.