Fireground Operations Glossary
The fireground is where tactics, command structure, and suppression techniques converge under extreme time pressure. This hub covers the language firefighters use from dispatch through overhaul — including Incident Command System terminology, attack line selection, ventilation strategies, search and rescue procedures, water supply, and Mayday protocols.
Topics covered: ICS/NIMS, offensive and defensive tactics, ventilation (horizontal/vertical/PPV), search and rescue, water supply, RIC/RIT, Mayday, overhaul, suppression foam, and structural fire behavior.
101Published terms
101 terms, A-Z
Alphabetical. First 24 shown - click "Show all" to expand.
D (2)
F (33)
Fire Attack GroupView definition, usage notes, and related operational context.Fire Attack LineView definition, usage notes, and related operational context.Fire Attack ModeView definition, usage notes, and related operational context.Fire Attack SequenceView definition, usage notes, and related operational context.Fire BehaviorView definition, usage notes, and related operational context.Fire FlowView definition, usage notes, and related operational context.Fire TriangleView definition, usage notes, and related operational context.fireground accountabilityView definition, usage notes, and related operational context.fireground briefingView definition, usage notes, and related operational context.fireground commandView definition, usage notes, and related operational context.fireground communicationsView definition, usage notes, and related operational context.fireground coordinationView definition, usage notes, and related operational context.fireground debriefingView definition, usage notes, and related operational context.fireground flow pathView definition, usage notes, and related operational context.Fireground IsolationView definition, usage notes, and related operational context.fireground liaisonView definition, usage notes, and related operational context.fireground logisticsView definition, usage notes, and related operational context.fireground reconnaissanceView definition, usage notes, and related operational context.Fireground RehabilitationView definition, usage notes, and related operational context.fireground safety briefingView definition, usage notes, and related operational context.Fireground Safety OfficerView definition, usage notes, and related operational context.fireground safety zoneView definition, usage notes, and related operational context.Fireground SectorView definition, usage notes, and related operational context.Fireground SectorizationView definition, usage notes, and related operational context.fireground situational awarenessView definition, usage notes, and related operational context.Fireground Size-UpView definition, usage notes, and related operational context.fireground stagingView definition, usage notes, and related operational context.fireground strategyView definition, usage notes, and related operational context.fireground tacticsView definition, usage notes, and related operational context.fireground ventilationView definition, usage notes, and related operational context.FlashoverView definition, usage notes, and related operational context.Flow PathView definition, usage notes, and related operational context.Flow Path ControlView definition, usage notes, and related operational context.
H (5)
Hot ZoneView definition, usage notes, and related operational context.hydrant pressure lossView definition, usage notes, and related operational context.Hydrant RelayView definition, usage notes, and related operational context.Hydraulic Rescue OperationsView definition, usage notes, and related operational context.Hydraulic VentilationView definition, usage notes, and related operational context.
I (5)
Incident Action PlanView definition, usage notes, and related operational context.Incident Command SystemView definition, usage notes, and related operational context.Incident Size-UpView definition, usage notes, and related operational context.Incident StabilizationView definition, usage notes, and related operational context.Initial AttackView definition, usage notes, and related operational context.
J (3)
P (6)
parasitic loadView definition, usage notes, and related operational context.Positive Pressure VentilationView definition, usage notes, and related operational context.post-incident analysisView definition, usage notes, and related operational context.Pressure-Reducing ValveView definition, usage notes, and related operational context.primary searchView definition, usage notes, and related operational context.pumping operationsView definition, usage notes, and related operational context.
Q (2)
R (8)
Rapid Intervention Crew (RIC)View definition, usage notes, and related operational context.Rapid Intervention Crew (RIC) DeploymentView definition, usage notes, and related operational context.Rapid Intervention Crew DeploymentView definition, usage notes, and related operational context.Rapid Intervention Crew StagingView definition, usage notes, and related operational context.Rapid Intervention Team (RIT)View definition, usage notes, and related operational context.Rapid Intervention Team (RIT) DeploymentView definition, usage notes, and related operational context.Rehab SectorView definition, usage notes, and related operational context.RIT (Rapid Intervention Team)View definition, usage notes, and related operational context.
S (5)
safety zoneView definition, usage notes, and related operational context.Search and Rescue (SAR)View definition, usage notes, and related operational context.search sector managementView definition, usage notes, and related operational context.situation status reportView definition, usage notes, and related operational context.Staging AreaView definition, usage notes, and related operational context.
T (8)
Tactical PrioritiesView definition, usage notes, and related operational context.tactical withdrawalView definition, usage notes, and related operational context.thermal imagingView definition, usage notes, and related operational context.thermal imaging cameraView definition, usage notes, and related operational context.Thermal Imaging Camera (TIC) DeploymentView definition, usage notes, and related operational context.Thermal Imaging Camera (TIC) UtilizationView definition, usage notes, and related operational context.thermal layeringView definition, usage notes, and related operational context.Transitional AttackView definition, usage notes, and related operational context.
U (4)
underfireView definition, usage notes, and related operational context.unified commandView definition, usage notes, and related operational context.upwind tacticsView definition, usage notes, and related operational context.utility controlView definition, usage notes, and related operational context.
V (5)
ventilation controlView definition, usage notes, and related operational context.ventilation openingsView definition, usage notes, and related operational context.Ventilation ProfileView definition, usage notes, and related operational context.ventilation profilingView definition, usage notes, and related operational context.ventilation tacticsView definition, usage notes, and related operational context.
W (7)
Water HammerView definition, usage notes, and related operational context.water shuttleView definition, usage notes, and related operational context.Water Shuttle OperationView definition, usage notes, and related operational context.water supplyView definition, usage notes, and related operational context.water supply assessmentView definition, usage notes, and related operational context.Water Supply ManagementView definition, usage notes, and related operational context.Water Supply PlanView definition, usage notes, and related operational context.
Fireground Operations: Core Vocabulary for Structural Firefighting
Fireground vocabulary is a compressed operational language built to eliminate ambiguity when seconds matter. From the moment an Incident Commander establishes command to the final overhaul sweep, every order and status report relies on shared terminology that all personnel understand identically.
This category covers the full arc of a structural fire response: size-up and initial attack, water supply and pump operations, ventilation strategy, interior search and rescue, RIC/RIT deployment, and Mayday procedures. It also includes the ICS/NIMS framework that governs how resources are ordered, tracked, and demobilized.
Frequently Asked Questions - Fireground Operations
What does 'going defensive' mean on the fireground?
Going defensive means withdrawing all interior crews and shifting to exterior suppression only. It is ordered when structural integrity is compromised or conditions no longer support safe interior operations. Command announces a PAR (Personnel Accountability Report) before transitioning modes.
What is a RIC/RIT and when is it deployed?
A Rapid Intervention Crew (RIC) or Rapid Intervention Team (RIT) is a dedicated crew staged outside the hazard zone, fully equipped and ready to immediately rescue a downed or trapped firefighter. NFPA 1710 and OSHA's two-in/two-out rule require a RIC be in place before interior attack begins on a reported structure fire.
What is the difference between horizontal and vertical ventilation?
Horizontal ventilation moves smoke and heat out through openings on the same level (doors, windows) using natural flow or positive pressure fans. Vertical ventilation cuts openings in the roof to allow hot gases to rise and exhaust directly upward, reducing heat and improving visibility for interior crews.
What does PAR stand for and when is it required?
PAR stands for Personnel Accountability Report - a roll call confirming all assigned personnel are accounted for and their status. It is required at tactical benchmarks: water on fire, fire under control, primary search complete, and any time an emergency traffic or Mayday is declared.
What is a Mayday and how is it transmitted?
A Mayday is an emergency transmission by a firefighter who is lost, trapped, running low on air, or injured inside the hazard zone. It is transmitted on the primary fireground channel by pressing the emergency button on the radio and stating LUNAR: Location, Unit, Name, Assignment, Resources needed.
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