Question

will fan and medal if help and correct What are two types of Ventilation? *

Positive Ventilation, Neutral Ventilation
Neutral Ventilation, Negative Ventilation
Positive Ventilation, Negative Ventilation
Minor Ventilation, Major Ventilation

Answer 1

@JoannaBlackwelder @phi @Vocaloid

Answer 2

@e.mccormick

Answer 3

This does not look like a math question. You would probably have better luck in a topic where people might know what sort of reference to ventilation you mean because it applies to the topic.