AUC 349 POSITIVE PRESSURE FANS

Question 0

The tendency of air is to move from an area of

Answer 0

Higher pressure to a lower pressure

Question 1

Positive pressure fans can be used in which stairwells

Answer 1

Attack and Evacuation stairs

Question 2

The units which carry these fans are usually dispatched on a

Answer 2

10-77

Question 3

The attack stairway shall be announced to

Answer 3

All members on scene via the primary tac channel 1 and also relayed to the borough dispatcher

Question 4

What is the stairway that will be given 1st consideration to be pressurized

Answer 4

The Attack Stairway

The Evacuation stairway will be pressurized when necessary

Question 5

Who informs the IC where to place the fans

Answer 5

Ventilation support group supervisor

Question 6

When the fans are in correct position who needs to be notified

Answer 6

IC, Stairwell pressurization will not be initiated until authorized by the IC

Question 7

PPF’s in operation should never be

Answer 7

Left unattended

Question 8

If negative results are happening with the fan operation we need to

Answer 8

• Throttle down the fan to idle
• Close the stairway door
• IC must be notified

Question 9

Due to the noise created by the fans

Answer 9

HT headsets (Dave Clark System) shall be utilized by members operating the fans to maintain communications

Question 10

The priority use of the PPF’s

Answer 10

1) Pressurizing the attack stairwell
2) Pressurizing the evacuation stairwell for smoke & CO control
3) Ventilating the public hallways for smoke and CO control

Question 11

Pressurization of the Attack stairways is most effective when

Answer 11

Done simultaneously with the fire attack

Question 12

The optimum placement of the fan is

Answer 12

4 to 6 feet back from the attack stairway door on the GROUND floor and directly facing the door at an 80 degree angle (468)

Question 13

The fan shall be placed to blow

Answer 13

Into the stairwell

Question 14

The PPF’S should not be placed

Answer 14

IN the stairwell. Placing the fan in the stairwell does not create any pressure in the stairwell. It may create higher CO levels and negative stack effect by pulling smoke and heat down the stairwell

Question 15

The pressure delivered to the attack stairway will be great enough to have

Answer 15

Up to 3 stairwell doors open and pressurization to remain effective.

Question 16

One fan can provide proper pressure in the stairwell up to

Answer 16

10 stories

Question 17

2 PPF’S can pressurize a

Answer 17

40 story building

Question 18

If the fire floor is ABOVE THE 10TH FLOOR or additional pressures are required a 2nd fan must be brought to

Answer 18

3 floors below the fire floor and set up

Question 19

In buildings over 40 feet tall the IC should consider

Answer 19

Special calling an additional ventilation support group

Question 20

When pressurizing the stairways the bulkhead door must

Answer 20

Remain closed unless there is an extreme smoke condition. We can vent these stairs by having a member BURP the bulkhead doors by opening them for approx 60 seconds at a time

Question 21

Sequential ventilation is done by

Answer 21

• Pressurizing the evacuation stairs
• PPF’s shall be placed on exterior of building with exhaust hoses being used
• The process will begin on the ground floor or cellar and continue on each floor until the CO is reduced to acceptable levels

Question 22

If CO levels are in the ___-___ range, gasoline powered PPF’S will not significantly reduce those levels due to the CO emissions produced by the fans

Answer 22

0-60 PPM
Do not request a Vent Support Group
Continue with natural ventilation