IFSTA CHAPTER 11 VENTILATION

Question 1

The Phenomenon of a strong air draft moving from ground level to the roof level of a building is known as?

Answer 1

Stack effect

Question 2

What is the minimum amount of personnel that should be used for roof ventilation?

Answer 2

2

Question 3

What effect is described when air currents throughout the building are drawn to a ventilation opening made in the upper portion of a building

Answer 3

Chimney effect

Question 4

What are combustion gasses flowing under a ceiling technically called?

Answer 4

Ceiling jet or mushrooming

Question 5

A square or rectangular roof vent opening should be at least how big?

Answer 5

4’ x 4’

Question 6

What is the updraft of heated air, fire gasses, and smoke directly above the fire involved area?

Answer 6

Thermal column

Question 7

What is an arched roof created by using short pieces of wood cut to a uniform length and may be supported by tie rods, buttress or both?

Answer 7

Lamella arch

Question 8

What is it called when smoke being blown out through a ventilation opening is drawn back in because the space around the ejector has not been blocked off?

Answer 8

Churning