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Changes to Step #28

Edit by Guy Kuo

Edit approved by Guy Kuo

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[title] Inflow/Outflow Balance: Maintain Positive Pressure
[* green] There must be sufficient flow to maintain positive pressure during inspiration. Also CO2 clearance must be adequate.
[* icon_note] I recommend a blower style fan with 200 to 250 static pressure, and single viral filter. 51 mm blower fans have tested far superior to afilters having 3 cm H20 or less flow resistance at 60 LPM. Viral filters with 1.5 cm H20 or lower resistance at 60 mm tubaxial fansLPM are desirable for larger users.
[* icon_note] I recommend a blower style fan with 200 to 250 static pressure, and single viral filter. 51 mm blower fans have tested far superior to afilters having 3 cm H20 or less flow resistance at 60 LPM. Viral filters with 1.5 cm H20 or lower resistance at 60 mm tubaxial fansLPM are desirable for larger users.
[* icon_reminder] Fan shall be oriented to pull air in through filter and vent into bag
[* icon_note] Bag is intentionally NOT stented open. We want the bag to readily collapse. This prevents development of negative pressure during inspiration.
[* icon_caution] Valves are never instantaneous. Configure your air intake and expiratory fittings to maintain positive to neutral pressure even during inspiration.
[* icon_caution] Do not massively increase fan power. Keep total liters/min flow to about 20-3020-40 L/min to remain well within anesthesia filter performance envelope.
[* icon_caution] Do not massively increase fan power. Keep total liters/min flow to about 20-3020-40 L/min to remain well within anesthesia filter performance envelope.

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