Ch 14 Special Vent Operations

Question 1

These elevators serve the lower floors of the building

Answer 1

Low rise elevators

Question 2

These elevators serve only those floors between the low rise and high-rise elevators

Answer 2

Mid rise elevators

Question 3

These elevators serve only in the upper floors

Answer 3

High rise elevators

Question 4

These elevators usually serve on the ground floor and the upper most floor of the building

Answer 4

Express elevators

Question 5

These elevators serve some or all floors

Answer 5

Freight elevators

Question 6

Fire behavior in high-rise buildings is most affected by _____ and ______

Answer 6

Stack effect, mushrooming

Question 7

__________. Tendency of heat, smoke, and other products of combustion to rise until the encounter a horizontal obstruction

Answer 7

Mushrooming

Question 8

________ . Formation of smoke into layers as a result of differences in density with respect to height with low density layers on the top and high density layers on the bottom

Answer 8

Stratification

Question 9

Most PPV blowers positioned at street level are effective up to about _______ floors

Answer 9

22

Question 10

One of the most direct means of moving personnel and equipment to the roof of a high-rise building when weather and smoke conditions permit is through the use of ______

Answer 10

Helicopters

Question 11

In a closed compartment, the point where the interior pressure is equal to the pressure outside the space is called the__________

Answer 11

Neutral pressure plane

Question 12

The standard that provides guidelines for the design and installation of smoke and heat venting equipment, NFPA ______, standard for smoke and heat venting, recommends using Automatic heat activated roof vents and curtain boards

Answer 12

204

Question 13

___________ also known as draft curtains, are fire resistive half walls that extend down from the underside of the roof

Answer 13

Curtain boards

Question 14

Curtain boards, also known as draft curtains, or fire resistive half walls that extend down from the underside of the roof. They generally extend a distance equal to at least_______ of the vertical distance from the floor to the roof but not lower than ________ above the floor

Answer 14

20 percent, 10 feet

Question 15

The function of curtain boards is to limit the_______ spread of heat and smoke by confining it to a relatively small area directly above its source

Answer 15

Horizontal

Question 16

________ is the natural vertical movement of heat and smoke in tall structures

Answer 16

Stack effect

Question 17

Assuming that the structure is closed, with little or no gas is being vented to the atmosphere, a neutral pressure plane exist at the level of ambient atmospheric pressure usually between 35 and______ percent of the building height

Answer 17

50

Question 18

Some windowless buildings have various forms of _______ glass walls that admit light but are of little value for tactical ventilation

Answer 18

Translucent

Question 19

It is SOP in many fire departments to attack high-rise fires from the _____ and to concentrate relief crews and spare equipment on the staging floor, ______ below the fire floor

Answer 19

Floor below the fire, two floors

Question 20

Some fire departments allow their firefighters to use ______ to ascend partway to the fire floor and to transport additional equipment when it is deemed safe to do so by the incident commander

Answer 20

Freight elevators

Question 21

A fully equipped fire fighter, especially one wearing a full toolbelt and carrying spare air tanks, can weigh more than _______

Answer 21

300 pounds

Question 22

If it is hotter inside than outside, the airflow will be inward at the bottom and outward at the top. But if the outside air is hotter than the air inside, the flow will be reversed. This is known as _______ 

Answer 22

Reverse stack effect

Question 23

Aldo referred to as ceiling jets in technical literature. Firefighters have long called this phenomenon _____

Answer 23

Mushrooming

Question 24

_______&________ often provides the best means of protecting the occupants of high-rise buildings

Answer 24

Aggressive ventilation, fire attack

Question 25

_________ can prevent or reduce mushrooming on the upper floors and does not promote lapping, which is always a danger when horizontally venting multistory buildings below the top floor

Answer 25

Top ventilation

Question 26

________ are the preferred method of roof access in high-rise structures

Answer 26

Aerial devices

Question 27

Wind also influences the stack effect by raising or lowering the neutral pressure plane. _______ pressure causes the neutral pressure plane to rise, and ______ pressure causes it to fall

Answer 27

Positive wind, negative

Question 28

Positive pressure ventilation may have to be supplemented if the fire floor is above the ________ floor

Answer 28

22nd

Question 29

Ventilating above the fire floor will be most effective if the process is started at the __________

Answer 29

Top of the building

Question 30

______&_____ are most common in large buildings having wide, undivided expenses of floor space

Answer 30

Roof vents, curtain boards

Question 31

_________ are intended to limit the spread of fire within a building by releasing heat and smoke to the outside before the fire mushrooms throughout the building

Answer 31

Automatic roof vents

Question 32

________ prevent smoke from spreading to other areas of the structure through the HVAC system

Answer 32

Smoke dampers

Question 33

Curtain boards, also known as ______, are fire resistive half walls that extend down from the underside of the roof

Answer 33

Draft curtains

Question 34

The function of curtain boards is to limit the horizontal spread of heat and smoke by confining it to a relatively small area directly above its source. They also concentrate heat and smoke directly under _______ to accelerate their actuation

Answer 34

Automatic roof vents

Question 35

Usually, but not always, ______have no windows and ______ have small windows between grade level and the first floor of the building

Answer 35

Cellars , basements

Question 36

As is true in other types of buildings, the greatest number of lives can often be saved in high-rise fires by an _______

Answer 36

Aggressive fire attack

Question 37

If a high-rise building is opened at the roof and at street level, the direction and intensity of airflow within the building depends primarily on the________

Answer 37

Relative temperature differences