Smoke Removal (ch.3)

Question 1

There are two basic methods that are utilized to pressurize a contaminated area. These are____ and ____ ventilation

Answer 1

Natural and mechanical positive pressure ventilation

Question 2

The current methods that are utilized to provide pressurized ventilation with portable blowers are____ and ___ ventilation

Answer 2

Negative and positive pressure ventilation

Question 3

Interior blowers are not efficient in removing contaminants at the ___

Answer 3

Top of room or building

Question 4

Compared to negative pressure ventilation, positive ventilation is approximately ___ as effective at removing contaminants from 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 and 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 that the exhaust opening is _______

Answer 6

Not large enough

Question 7

Te m p e r a t u r e , h u m i d i t y, a n d r a i n d o n o t h a v e a n y a p p r e c i a b l e e ffect on positive pressure ventilation.
True or false?

Answer 7

True

Question 8

It is most advantageous to pressurize the structure on the ____ side and exhaust on the ___ side

Answer 8

Windward side

Leeward

Question 9

Positive pressure proven effective against winds of up to ____ mph

Answer 9

25

Question 10

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

Answer 10

Lack of lubrication to crank shaft

Question 11

For standard entrances openings , max effectiveness is achieved by placing 2 blowers ____ with each other

Answer 11

In series (in-line)

Question 12

Place larger blower about ___ ft back from entrance opening an utilize the smaller blower behind the larger blower.

Increases capacity of large blower by ___ %

Answer 12

2 ft back2ft back

10%

Question 13

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

Answer 13

3 to 4 ft back

Question 14

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

Answer 14

50%

Question 15

Water power blowers will produce _____ CFM than the same size gasoline blowers

Answer 15

More

Question 16

Concentrations of carbon monoxide within the range of ______ ppm to _____ ppm are easily obtainable during overhaul operations

Answer 16

500ppm to 1200ppm

Question 17

To _____ppm of carbon monoxide for one hour is dangerous

Concentrations of _____ ppm of carbon monoxide and over is _____ in less than one hour

Answer 17

1200 = dangerous

4000ppm = fatal

Question 18

Measurements during actual overhaul operations have indicated that positive pressure can easily reduce carbon monoxide concentrations of 1000 ppm to approximately ____ppm to ____ppm.

Answer 18

130 to 220ppm

Question 19

A single 18” blower is adequate for an average (_____ square ft) single family dwelling

Answer 19

2000 square ft