In discussion with hyperbaric technician: Johan Olivier, new useful information with regards to airflow has been made available and will have a significant impact on the technical attributes of the design in the following areas:
There will need to be a demand based mechanism in place for the expiratory airway due to the fact that air moving from a pressurized volume into a non-pressurized volume will cause a natural vacuum effect. Therefore the opening of the airway must be completely controlled by a positive pressure change in the mask (i.e expiring air). Otherwise the outlet will behave in the same way as a vacuum and will continue to draw air from the mask.
26/07/11
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