Ventilation

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Ventilation

• Rural/Metro Division of Fire
• Knox County, TN

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Ventilation

• Is the systematic removal of heated air, smoke,
  or other airborne contaminates from a structure
  and replacing it with a supply of
• fresher air

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Advantages to Ventilation

• Rescue Operations
• Fire Attack
• Extinguishment
• Property Conservation
• Fire Spread Control

• Reduction of both
• Flashover Potential
• Backdraft Potential

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Objectives

• Horizontal Ventilation
• Vertical Ventilation
• Vent Hole Placement
• Ventilation Tactics
• In place Ventilation Controls

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Reasons to Ventilate

• Life
• Fire

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Forced Ventilation

• Ensures Positive Control of Fire
• Supplements Natural Ventilation
• Speeds the Removal of Contaminates
• Reduces Smoke Damage
• Promotes Good Public Relations

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Horizontal Ventilation

• Positive Pressure
• Hydraulic
• Few firefighters required
• Quick
• Effective if done correctly
• Cone of Air Covering Entire Opening

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Positive Pressure Ventilation
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Horizontal Ventilation

• Placement of PPV or Positive Pressure Ventilation
  at Entry Point
• All Other Exterior Openings Closed
• By Closing Doors Within the Structure One Room or
  Area Can be Pressurized and Cleared of Smoke at a
  Time.

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Vertical Ventilation

• Generally means opening the roof or existing roof
  openings for the purpose of allowing contaminates
  to escape.
• Time Consuming
• Manpower
• Safety

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Size up

• Construction type
• Extent of fire/Building condition
• Where will smoke go?
• Wind

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The Task

• Reading the roof
• Tactics
• Pitched
• Bowstring
• Flat
• Horizontal
• Basement

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What will it take

• Existing openings
• Personnel
• Time

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Vent Hole Placement

• Why are we venting?
• Size up?
• What will it take to ventilate?

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Smoke Removal
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Roofs
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In Place Controls

• HVAC
• Attic Fans
• Automatic Roof
• Roof Ventilators
• Atrium Vents
• Monitors
• Skylights

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Coordinating with Maintenance

• Shutting down system to prevent spread
• Routes of ducts
• Can they be used for smoke evacuation
• Finding false ceilings/framing for ducts
• What fire stopping equipment is in place

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Most Important

• Safety
• Safety
• Safety