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From Flashcardlet > AUC 349 + ADD > Flashcards

AUC 349 + ADD Flashcards

1
Q
  1. What does Positive Pressure Fan do & what can it be used on?
  2. Natural tendency of air movement
  3. PPF shall be dispatched on signal _ &
A
  1. Pressurize attack & evacuation stairwells to keep heat & smoke from entering stairwells or to vent the bldg. Works on smoke & CO
  2. Higher pressure area to lower pressure area
  3. 10-77 & special called by IC
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2
Q
  1. The 1st consideration for PPF is _ stairway
  2. The _ stairwell shall be pressurized when necessary for sequential ventilation
  3. Can the Vent Support Group Supervisor initiate stairwell pressurization?
A
  1. Attack Stairway: FFs should be notified via HT & Dispatcher when attack stairs designated
  2. Evacuation stairs
  3. No only IC can. Vent Group Supervisor informs IC of recommended placements of PPF
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3
Q
  1. Priority Order for use of PPF (3)

2. Does the PPF in the attack stairwell provide an uncontaminated area of refuge for members?

A
  1. Pressurizing Attack Stairway to support fire attack throughout attack stairway, Pressurizing Evac stairs for smoke & CO control, & Vent public hallways for smoke & CO control
  2. Yes
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4
Q
  1. The initial location for PPF should be _
  2. PPF will be great enough to allow for up to _ stairwell doors to be open & pressurization to remain effective
  3. 1 fan can provide proper pressure in stairwell up to _ stories & 2 fans will pressurize _ story bldg
A
  1. Ground floor- try to utilize an exterior door to reduce noise & CO levels for ICP
  2. Up to 3, but keeping as many doors closed as possible is the goal (even if HL stretched close door as much as possible)
  3. 10; 40
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5
Q
  1. If units are committed on fire fl but extreme smoke condition of stairwell- PPF can _
A
  1. Begin pressurization on ground fl w/fire fl door closed as much as possible for HL. Vent Group Roof FF shall burp the bulkhead door open until smoke clears approx 60 sec & shut bulkhead. Pressurization maintains in stairwell w/bulkhead open or closed
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6
Q
  1. If CO levels are in the - ppm range, gas powered PPF will NOT significantly reduce CO levels
  2. One 27” gas powered fan moves approx _ times more air than 16” electric box fan
A
  1. 0-60 PPM

2. approx 5 times (24,000 CFM)

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7
Q
  1. What can be used to create Negative Pressurization?

2. Negative pressure is beneficial in _ areas

A
  1. Lad Cos electric box fan operated in exhaust mode to remove contaminated air
  2. Below grade areas
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8
Q
  1. Ladder Cos that carry PPF are designated _ & report to _
  2. The Off of PPF is designated
  3. The members assigned to operate the fans are designated
A
  1. Ventilation Support Group Companies; ICP
  2. Ventilation Group Supervisor
  3. Ventilation Group Lobby Unit, Vent Group Fire Unit, Roof FF: Vent Group Roof
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9
Q
  1. Once PPF put in operation, can they be left unattended?

5. What if negative results are encountered w/PPF?

A
  1. Never unattended- HT equipped FF must continually monitor-Dave Clark set
  2. Discontinue by throttling fans to idle, close stairwell door, & notify IC
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10
Q
  1. Pushing fresh air into areas that need to be pressurized or ventilated is preferred method for positive pressure vent. Optimum placement is _
  2. The fan should be positioned to blow (into/out) of stairwell & (should/should not) be placed in stairwell
A
  1. 4-6’ from Attack stairway door on ground floor (NOT in stairway) & directly facing the door to stairwell at an angle tilt of 80 degrees
  2. Into; Should NOT- may create high CO levels & negative stack effect by pulling smoke & heat
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11
Q
  1. Fire above the _ floor- add’l PPF req’d & set up __

5. Extreme smoke condition in Attack Stairwell (how do you remove)

A
  1. Above 10th fl; 3 Flrs below & set up same as 1st fan 4-6’ back 80 angle (NOT in stairwell)
  2. When units NOT committed on fire fl- PPF on ground fl & Vent Roof FF shall open bulkhead (burp) approx 60 sec & shut bulkhead. Stay at bulkhead position
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12
Q
  1. Sequential Ventilation is done after fire extinguished to remove products of combustion vertically through _ by placing a fan at the base of _. Keep he bulkhead of _ stairway open & _ closed. Open stairwell doors on fire floor for _ stairway.
A
  1. Attack Stair; base of Evac Stairwell; Attack bulkhead open & Evac closed; Both doors to cross vent
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13
Q
  1. Does wind have to be considered when using PPF?

4. Fans blowing fresh exterior air into the structure have shown to be _% more efficient than negative pressure vent.

A
  1. Yes Wind must ALWAYS be considered

4. 75%

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14
Q
  1. During Negative pressurization, if a box fan cannot be hung or tarps not available, position fan inside contaminated area facing exhaust opening _ feet back tilted _ degrees
  2. How many FF to lift PPF?
  3. PPF inspected _
A
  1. 6-8’ approx 30 degree tilt
  2. 2 members
  3. Inspected & started daily 9X6 tour. Weekly at MUD full RPM run for 5 min along w/visual inspection. Repairs to Tech Services
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