Question

Positive pressure ventilation involves artificially raising pressure inside the structure so that:

a) Smoke is expelled
b) Fresh air is drawn in
c) Fire intensity increases
d) Airflow remains unchanged

Answer 1

Positive pressure ventilation is used to expel smoke from a building by increasing the indoor air pressure higher than the atmospheric pressure.

Step-by-step explanation:

Positive pressure ventilation involves artificially raising the pressure inside a structure so that smoke is expelled. This technique is used in various situations, including firefighting, to clear smoke from a building by increasing the indoor air pressure using mechanical means. As the indoor air pressure becomes higher than the atmospheric pressure, the high-pressure air forces the smoke to move outside, creating a safer and more visible environment for firefighters and victims potentially trapped inside.