B-122 Ventilation

Question 1

Natural ventilation refers to the technique of ____

Answer 1

making openings in the structure and allowing the ambient wind, weather conditions and natural convection currents to ventilate the structure.

Question 2

Personnel must know the type of roof that needs ventilation and make sure that there is a ____ present and available for use.

Answer 2

• charged hose line
  (NOTE: Roof lines are only used to protect personnel and external exposures-do not operate hose line into ventilation hole unless ordered by the IC).

Question 3

Communicate and coordinate all ventilation efforts with interior crews and make ventilation holes over hot areas that are directly over the fire. Make sure to make ____ and always try to make these openings ____.

Answer 3

• one big hole (4’x4’ minimum) rather than several small holes
• as close as possible to the ridge line

Question 4

Consider using the aerial ladder for lighting during nighttime roof operations. When lighting the roof area from aerial ladders, be sure to ____.

Answer 4

light the area high above the working area at a high angle so roof crews are not blinded by the cross lighting

Question 5

Fog streams should not be used for venting if they:

Answer 5

(1) damage items that have been removed for protection; (2) create exterior or adjourning building damage; and/or (3) create damage inside of room from which it was directed.

Question 6

A PPV fan should be placed ____ from the doorway of the structure so that its cone of air extends beyond the opening boundaries and into the structure.

Answer 6

6’ - 10’

Question 7

During multiple fan usage for PPV, the larger blower should always be placed ____ when different size fans are used; fans should be positioned so the first fan is located ____ from doorway and the second fan another ____ behind the first fan.

Answer 7

• in front of the smaller blower
• 3’- 5’
• 3’-5’

Question 8

Never ____ into an operating PPV exit point.

Answer 8

direct a fire stream

Question 9

All ventilation operations shall be ____ so that fire attack teams can rapidly advance to the seat of the fire.

Answer 9

coordinated with interior operations

Question 10

If the fire is vented before the attack teams are ready to advance, the fire can ____

Answer 10

accelerate and spread rapidly throughout the structure thus endangering occupants and personnel working within the structure.

Question 11

Apartment buildings with common cocklofts may require ___.

Answer 11

a trench cut