At 40, a HAFOE (high air flow with oxygen enrichment) mask is ...

[jeatrice]

At 40, a HAFOE (high air flow with oxygen enrichment) mask is operating with an air-to-oxygen entrainment ratio of:
 A) 1:1
  B) 2:1
  C) 3:1
  D) 4:1

Question 2

HAFOE (high air flow with oxygen enrichment) masks operate using:
 A) the venturi principle
  B) Bernoulli's principle
  C) viscous shearing and vorticity
  D) none of the above

[Toya9913]

Answer to Question 1

C

Answer to Question 2

C

[jeatrice]

Thanks for the timely response, appreciate it

[parshano]

Great answer, keep it coming