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IAFF
Acronym, International Association Of Fire Fighters".


IDLH
Any situation deemed Immediately Dangerous to Life and Health. More narrowly defined by OSHA. See main IDLH article. An area of maximum danger to firefighters.


IFSTA
Acronym, International Fire Service Training Association". A major publisher of firefighter training materials.


Incident Command System (ICS)
System first developed to provide a command structure to manage large wildfires in the United States, now widely used by many emergency management agencies.


Incident Commander
The officer in charge of all activities at an incident. See Incident Command System.


Incident Safety Officer
The officer in charge of scene safety at an incident. See Incident Command System.


Indian pump
(aka Indian Tank) A brand of five-gallon water can, or back-pack bladder, featuring a short hose and hand pump for use in wildland firefighting.


Indian pump
Water vessel carried on one's back, either a rigid can or collapsible bag, with a hose and telescoping squirt pump. Contains 5 US gal, and is used on hot spots and during mop up. Also called bladder bag (if collapsible), piss pump, or Fedco.


Indirect attack
A method of suppression in which the control line is located some considerable distance away from the fire's active edge. Generally done in the case of a fast-spreading or high-intensity fire and to utilize natural or constructed firebreaks fuel breaks and favorable breaks in the topography. The intervening fuel is usually backfired; but occasionally the main fire is allowed to burn to the line, depending on conditions.


Indirect attack
Method of firefighting in which water is pumped onto materials above or near the fire so that the splash rains onto the fire, often used where a structure is unsafe to enter.


Infrared (IR) detector
A heat detection system used for fire detection, mapping, and hotspot identification.


Initial attack
First point of attack on a fire where hose lines or fuel separation are used to prevent further extension of the fire.


Initial attack
The actions taken by the first resources to arrive at a wildfire to protect lives and property, and prevent further extension of the fire.


Intake
Part of pump where water enters when pump forms partial vacuum.


Interface zone
Where urban firefighting meets wildland firefighting. Structures at the edges of wildlands are threatened and require skills and equipment of both disciplines.


Interface zone (also wildland/structural interface or urban/wildland interface)
The zone where wildfires threaten structures or structural fires threaten wildlands, such as in residential areas adjacent to forests. This requires both wildland firefighting and structural firefighting in the same location, which involve very different tactics and equipment.


Irons
The flathead axe mated with the halogon bar


Irons, or Set of irons
Pairing of a flat-head axe and a Halligan tool. A common combination used in forcible entry operations to gain access for search and rescue as well as interior fire attack.


ISO Rating
(Insurance Services Office Fire Insurance Rating) This is a rating published by the Insurance Services Office. Insurance companies use this number to determine homeowner insurance premiums.