Extinguishing Chimney Fires With Positive Pressure Ventilation

Extinguishing a working chimney fire with PPV and a dry chemical extinguisher is a relatively easy task to perform. It eliminates the need for placing personnel in harms way with extended roof operations, especially during periods of inclement weather...


Extinguishing a working chimney fire with PPV and a dry chemical extinguisher is a relatively easy task to perform. It eliminates the need for placing personnel in harms way with extended roof operations, especially during periods of inclement weather.

Session Reference: 1

Topic: Basic Firefighting: Extinguishing Chimney Fires With Positive Pressure Ventilation

Level of Instruction: 3

Time Required: 2-3 Hours

Learning/Teaching Aids:

• Electric powered PPV blower or gas-powered blower

• A minimum 21-24" in diameter (shroud) for optimal ventilation

• Dry chemical extinguisher

• An acquired structure with chimney intact or training center structural building with chimney area

• Streamers and theatrical smoke generator (optional) if an acquired structure is not available]

• If PPV blowers not available, use smoke ejectors stacked and reverse direction

• Fire department pumper equipped with structural firefighting hose-lines and a water source

Behaviors to Foster:

• Understand the reasoning behind not placing personnel on a pitched roof during periods of inclement weather to extinguish chimney fires.

• Understand the process of chimney fire extinguishment using PPV and a dry chemical extinguisher.

• Understand that PPV will not extend chimney fire into uninvolved portions of the structure if traditional firefighting activities are conducted in conjunction with this technique.

Task: The student will be able to extinguish a chimney fire on a structure with a pitched roof, functioning as a member of a team.

Given: A structure with a chimney, pitched roof, a dry chemical extinguisher, a PPV blower, appropriate fire suppression apparatus, and a supervising officer.

Standard: So that personnel are eliminated from roof activities, a working chimney fire is effectively extinguished using PPV and a dry chemical extinguisher, and any potential for fire spread through fractures/breaches in the flue system is prevented and held in check.

Prerequisite Knowledge:

• Chimney construction

• PPV blowers and positive pressure ventilation tactics

• Firefighting strategies for interior attack

• Dry chemical extinguishers

• Fire spread/behavior

Prerequisite Skills:

• Ability to relate extinguishment strategies to chimney fire scenarios

• Ability to teach before an audience - verbally and in written format

• Ability to direct the extinguishment efforts of a team assigned to interior operations

• Ability to determine potential paths for fire spread

• Ability to stop any potential fire spread from a chimney fire into the actual structure

Preparation

Motivation: Extinguishing a working chimney fire with PPV and a dry chemical extinguisher is a relatively easy task to perform. It eliminates the need for placing personnel in harms way with extended roof operations, especially during periods of inclement weather. Typical chimney fire operations take between 1-11/2 hours to mitigate. PPV and a dry chemical extinguisher will cut the extinguishment activity to 10-15 minutes because it is much less labor intensive.

Objective (SPO): The student will function as a member of an interior attack team, will extinguish a chimney fire using positive pressure ventilation, a dry chemical extinguisher, and the required hoselines in place from a fire department pumper to the satisfaction of the instructor.

Overview: Basic Firefighting: Extinguishing Chimney Fires With Positive Pressure Ventilation

• Chimney Construction Features

• Extinguishment

• Check for Extension

Basic Firefighting: Extinguishing Chimney Fires With Positive Pressure Ventilation

SPO 1-1 The student will function as a member of an interior attack team, will extinguish a chimney fire using positive pressure ventilation, a dry chemical extinguisher, and the required hoselines in place from a fire department pumper to the satisfaction of the instructor.

EO 1-1 Identify the characteristics of standard chimney construction and its relation to the interior/exterior of a structure.

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