*Bk 29- Smoke Removal

Question 1

The current methods that are utilized to provide pressurized ventilation with portable blowers are ________ and _________ pressure ventilation.

Answer 1

Negative and positive

Question 2

During negative pressure ventilation, the blower is placed inside or outside of the structure?

Answer 2

Inside

Question 3

For positive pressure ventilation, is the blower placed inside or outside of the structure?

Answer 3

Outside

Question 4

Compared to negative pressure ventilation, positive pressure ventilation is approximately how much more effective at removing contaminants from a building.

Answer 4

Twice

Question 5

Positive pressure is most efficient when the exhaust opening (heat hole, window, door, etc.) is between ________ to ________ the size of the entrance opening

Answer 5

3/4 to 1 3/4

Question 6

If a gasoline powered blower is being utilized and an exhaust odor is noticeable inside the building or area to be ventilated, this is an indicator of what?

Answer 6

That the exhaust opening is not big enough

Question 7

Positive pressure has proven effective AGAINST winds (leeward to windward) of up to ______ mph

Answer 7

25

Question 8

The effective implementation of positive pressure is dependent on what 5 things?

Answer 8

1. Entrance opening
2. Airflow between openings
3. Exhaust openings
4. Weather
5. Training/communication

Question 9

A single blower should be positioned so the cone of pressurized air ________ covers the entrance opening

Answer 9

Just

Question 10

Tilting blowers at angles more than the manufacturer designed will result in what?

Answer 10

Lack of lubrication to the crankshaft

Question 11

When blowers are placed in series, the first blower should be placed how far back from the opening?

Answer 11

2 feet

Question 12

When blowers are in series, the rear blower augments the front blower by what percent?

Answer 12

10%

Question 13

If two blowers of unequal CFM are utilized in the series position, how should they be lined up?

Answer 13

Larger blower up front, smaller blower behind

Question 14

If the area in front of an entrance opening is limited to three or four feet (i.e., raised porch), place the smaller blower in the entrance opening and the larger blower how many feet back from the door?

Answer 14

3-4ft

Question 15

What two ways can multiple blowers be positioned?

Answer 15

Series and parallel

Question 16

Effective ventilation with blowers requires ___________ VENTILATION of contaminated areas within a building.

Answer 16

Systematic

Question 17

Removing screens on windows prior to using these openings for ventilation purposes will increase the efficiency of these openings by at least what percent?

Answer 17

50%

Question 18

Water powered blowers will produce considerably MORE or LESS CFM than the same size gasoline blowers?

Answer 18

More

Question 19

_______ ppm of carbon monoxide inhaled for one hour is dangerous

Answer 19

1200

Question 20

_______ ppm of carbon monoxide inhaled for one hour will cause some appreciable effects

Answer 20

700

Question 21

Concentrations of ________ ppm of carbon monoxide and over are fatal in less than one hour.

Answer 21

4000

Question 22

______ ppm of carbon monoxide can be inhaled for one hour without appreciable effects.

Answer 22

500

Question 23

Positive pressure can easily reduce carbon monoxide concentrations of 1000 ppm to approximately _______ to ______ ppm.

Answer 23

130-220

Question 24

A single 18” blower is adequate for an average single family dwelling that is how many square feet?

Answer 24

2000

Question 25

Depending on the type of fire, concentrates of carbon monoxide can easily be obtained in the range of ____ to ____ppm during overhaul operations.

Answer 25

500 to 1200ppm

Question 26

Proper blower placement will assist in?

Answer 26

- Assist in search and rescue, extinguishment, overhaul, and other suppression operations - Reduce or eliminate the numerous products of combustion. - Reduce the interior temperature within a structure. - Improve visibility for occupants and fire suppression personnel. - Increased safety for occupants and fire suppression personnel. - Reduce fire loss.

Question 27

Interior blowers are not efficient in removing contaminants at the ____ of a room or building.

Answer 27

Top

Question 28

Positive pressure ventilation: The size of the exhaust opening is dependent on what?

Answer 28

- Size of the entrance opening | - Capacity and number of blowers being utilized

Question 29

Does temperature, humidity, and rain have any appreciable effect on positive pressure ventilation?

Answer 29

No

Question 30

Positive pressure ventilation: Multi-habitational occupancies (center halls) can be effectively ventilated by first pressurizing what area?

Answer 30

Appropriate stairways and hallways

Question 31

Depending on the floor plan of a building and the location of the fire, opposing blowers can be effectively utilized to remove contaminants in a hallway and an apartment. Can blowers of unequal ratings be used in this situation?

Answer 31

Yes, Blowers of unequal ratings or equal ratings can be effectively utilized for this ventilation operation.

Question 32

A multi-habitational occupancy that may need creative techniques for positive pressure ventilation are ____ story center hallway apartments.

Answer 32

2

Question 33

To effectively use positive pressure ventilation in a high rise, position blowers(s) on the _____ (interior or exterior?) of the building and pressurize the opening to the ______ that is common to the contaminated floors

Answer 33

Exterior Stairshaft

Question 34

Use of water powered blowers should be considered in what type of structures?

Answer 34

- Metro rail tunnels - High rise buildings - Large underground parking structures - Very large commercial buildings. (should also be considered in rest homes, hospitals, and other types of structures where respiratory concerns should be considered)

Question 35

Positive pressure does not have a tendency to accelerate or spread fire that may still be in the overhaul area. However, caution should be exercised when using positive pressure with _____ type fires.

Answer 35

smoldering type fires (i.e., mattress, overstuff, etc.)

Question 36

If any fire does begin to accelerate or spread during positive pressure ventilation, it can easily be controlled by doing what? (5 options)

Answer 36

- Extinguishing the fire - Turning the blower 90 degrees away from opening - Reducing the RPM of the blower - Increasing the distance between the overhaul area and the blower - Shutting the blower off

Question 37

What are the two basic methods that are utilized to pressurize a contaminated area to enhance or direct the travel of contaminants to the exterior?

Answer 37

Natural and mechanical positive pressure ventilation