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  • Right of Entry

    Right set forth by the administrative powers that allows an inspector to inspect buildings to ensure compliance with applicable codes

  • right ventricle

    The lower right chamber of the heart, which receives blood from the right atrium and pumps blood out through the pulmonic valve into the pulmonary arteries.

  • Ringdown (radio)

    A radio, incorporating a selective calling capability, has an attention-getting device triggered by a dispatching center. A triggered device emits a sound alerting staff at a fire station, in an ambulance, on a vehicular radio or at a vehicular data Read on! →

  • Ringdown (telephone)

    An Automatic ringdown circuit consists of two phones at different locations. When either phone goes off-hook, the one at the other end instantly rings.

  • Ringer’s solution

    A sterile intravenous solution containing sodium, potassium, calcium, and chloride ions in concentrations similar to those present in blood. It is useful for replacing fluid losses, as in dehydration.

  • Riot Control Agent

    Chemical compound that temporarily makes people unable to function by causing immediate irritation to the eyes, mouth, throat, lungs, and skin

  • Riot Control Agent

    Chemical compound that temporarily makes people unable to function by causing immediate irritation to the eyes, mouth, throat, lungs, and skin

  • Riser

    Vertical water pipe used to carry water for fire-protection systems aboveground such as a standpipe or sprinkler system

  • Riser

    Vertical water pipe used to carry water for fire-protection systems aboveground such as a standpipe or sprinkler system

  • risk factor

    A factor that leads to and perpetuates a disease process.

  • Road Tests

    Preservice apparatus maneuverability tests designed to determine the road worthiness of a new vehicle.

  • Rollover

    Condition in which the unburned combustible gases released in a confined space (such as a room or aircraft cabin) during the incipient or early steady state phase accumulate at the ceiling level. These superheated gases are pushed, under pressure, away Read on! →

  • Rollover

    The ignition of ceiling-level fire gases. Contrast Flashover, above.

  • Rollover

    Condition in which the unburned combustible gases released in a confined space (such as a room or aircraft cabin) during the incipient or early steady state phase accumulate at the ceiling level. These superheated gases are pushed, under pressure, away Read on! →

  • Roof Covering

    Final outside cover that is placed on top of a roof deck assembly

  • Roof Covering

    Final outside cover that is placed on top of a roof deck assembly

  • Roof Deck

    Bottom components of the roof assembly that support the roof covering; may be constructed by such components as plywood, wood studs (2 by 4 inches or larger), lath strips, and other materials

  • Roof Deck

    Bottom components of the roof assembly that support the roof covering; may be constructed by such components as plywood, wood studs (2 by 4 inches or larger), lath strips, and other materials

  • Roof Ladder

    Straight ladder with folding hooks at the top end. The hooks anchor the ladder over the roof ridge.[16]

  • Roof sector (Roof group, Roof division)

    A crew, typically a ladder company, assigned to the roof of a structure, most often for purposes of vertical ventilation during a fire. May also be assigned to check roof-mounted equipment, HVAC, etc., for fire or malfunction.

  • Rope hose tool

    Short strap or rope with a hooks at both ends for wrapping around a charged hose to secure it in position or to assist in moving it.

  • Rotary Gear Positive Displacement Pump

    Type of positive displacement pump commonly used in hydraulic systems. The pump imparts pressure on the hydraulic fluid by having two intermeshing rotary gears that force the supply of hydraulic oil into the pump casing chamber.

  • Rotary Vane Pump

    Type of positive displacement pump used commonly in hydraulic systems. A rotor with attached vanes is mounted off-center inside the pump housing. Pressure is imparted on the water as the space between the rotor and pump housing wall decreases.

  • Route of Entry

    Pathway by which a hazardous material enters (or affects) the human body

  • Route of Entry

    Pathway by which a hazardous material enters (or affects) the human body

  • Run card system

    A system of pre-planning for fire protection in which information about specific detectors, hazards, or other emergency response plans is indexed by location, for rapid reference during an alarm.

  • Running Call

    A call, ‘Shout’, with persons reported.

  • Rupture Disk

    Formed, thin metal membrane or diaphgram designed to burst at a predetermined pressure and temperature in order to prevent overpressurization of the attached vessel or container; pressure-relief device

  • Rupture Disk

    Formed, thin metal membrane or diaphgram designed to burst at a predetermined pressure and temperature in order to prevent overpressurization of the attached vessel or container; pressure-relief device