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G6 Ventilation (NCI 8)
G6 Ventilation (NCI 8)
Purpose
This document provides for:
carrying out ventilation at incidents.
Contents
Requirements for ventilation .................................................................................................... 1
Ventilation at fires procedure ................................................................................................... 2
Hazard Identification and Control: Ventilation .......................................................................... 3
Requirements for ventilation
Executive Officers’ responsibilities
Chief Fire Officers will issue a procedure for ventilation at:
fires
hazardous substance emergencies
operating in confined spaces
other places where ventilation is required.
Fire Region Managers will ensure that every Fire District in the Fire Region has a procedure in
accordance with this instruction.
Local procedures
Local procedures will take into account:
under the Official Information Act
authorisation of ventilation
tactics
crew safety
use of positive pressure ventilation.
Released
PPV Technical Manual
When PPV is carried out, NZFS personnel will follow the procedures described in:
the
PPV Technical Manual.
NZFS Department of Operations and Training
Page 1 of 3
G6 Ventilation December 08
G6 Ventilation (NCI 8)
Ventilation at fires procedure
Operations
Ventilation will only be carried out on the instruction of the OIC Fire.
Upon arrival
Upon arrival at the incident, the OIC Fire will assess the situation by gathering the following
information:
if persons are reported trapped in the building by fire, establish their location
Act
assess the size location and nature of the fire
assess the suitability of inlet and outlet vents
determine wind direction
assess the potential fire spread.
Tactics
Select the method of ventilation to be used:
natural
Information
forced
- positive pressure
- negative pressure
- building systems
Official
offensive/defensive
vertical/horizontal.
the
To establish ventilation:
estimate the size of the compartment to be ventilated
create outlet and inlet vents (construct outlet vent first)
under
ensure that a continuous path is established and maintained before proceeding
if using positive pressure ventilation (PPV), ensure that the fan is positioned correctly
- set up deliveries to cover the outlet vent and exposures
- check that the number of outlet vents are adequate
- establish communications between IC, PPV operator and BA crews
- make all crews aware when ventilation is about to take place
Released
- check for backdraught/flashover conditions
- consider withdrawing crews from inside of building
- monitor size, spread and any changes in fire behaviour
- monitor volume, colour, quantity and pressure of smoke
brief oncoming and relief crews.
NZFS Department of Operations and Training
Page 2 of 3
G6 Ventilation December 08
G6 Ventilation (NCI 8)
Hazard Identification and Control: Ventilation
Hazard control
All hazards will be controlled by eliminating, isolating where elimination is impracticable, or
minimising, using one or more of the control methods given in the below:
Ventilation
Hazards
Control measures
Significant hazards:
applying Safe Person Concept
pre-planning and risk assessment
Act
backdraught
structural firefighting uniform and BA worn
flashover
correctly
usual hazards associated with fire fighting
all personnel are under appropriate
supervision
briefing crews on the action plan (IAP or
AAP) and on safety measures
all personnel trained in the methods, risks,
and safe practices needed when carrying
out ventilation, including:
forced entry Information
natural ventilation
recognition of potential for flashover and
backdraught
designated crews will be trained in the
methods, risks and safe practice for
carrying out positive pressure ventilation
all personnel are under supervision
Official
be aware of exposures created by
ventilation
the
Once structure entered
Significant hazards:
As above, PLUS
As Above, PLUS
communications need to be established
between OIC Fire, internal crews and
increased fire intensity
under
ventilation crews
pushing fire into compartments that are
consideration of additional support for
not exposed to fire
search and rescue crews
Released
NZFS Department of Operations and Training
Page 3 of 3
G6 Ventilation December 08