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  • NFPA 704

    Standard system for the Identification of the Hazards of Materials for Emergency Response; Labeling system for identifying hazardous materials in fixed facilities; its color-coded, symbol-specific placard is divided into sections that identify the degree of hazard with respect to health, Read on! →

  • NFPA 704

    Standard system for the Identification of the Hazards of Materials for Emergency Response; Labeling system for identifying hazardous materials in fixed facilities; its color-coded, symbol-specific placard is divided into sections that identify the degree of hazard with respect to health, Read on! →

  • NH

    National Hose thread, also known as NST (National Standard Thread). Commonly used in fire hose couplings, it has a slightly larger thread diameter and coarser pitch (fewer threads per inch) than the alternative NPSH thread. The threads specified in NFPA Read on! →

  • NIFTI

    Naval InFrared Thermal Imager. A device used aboard naval ships to help locate hotspots where fire or personnel may be located in a dense smoke environment.

  • NIMS

    The National Incident Management System. A federally mandated program for the standardizing of command terminology and procedures. This standardizes communications between fire departments and other agencies. It is based upon simple terms that will be used nationwide. Currently, U.S. federally Read on! →

  • NIOSH

    National Institute for Occupational Safety and Health. A U.S. agency responsible for investigation of workplace deaths, including firefighters.

  • nitrogen

    An element making up about 80 percent of the air we breathe, present in all plant and animal tissues.

  • nocturia

    The necessity to get up at night to urinate.

  • nodal

    Usually, pertaining to the AV node.

  • noise

    Extraneous deflections in the ECG signal. It may be caused by muscle tremor, 60-cycle AC interference, loose electrodes, and weak radio transmission.

  • Nomex

    Brand of approved, fire retardant, synthetic, aramid cloth and thread used in personal protective equipment for wildland firefighting, and jumpsuits.

  • Non load-bearing walls.

    Wall, usually interior, that supports only its own weight.

  • Nonbulk Packaging

    Package that has the following characteristics: (a) maximum capacity of 119 gallons or less as a receptacle for a liquid (b) maximum net mass of 882 pounds or less or a maximum capacity of 119 gallons or less as a Read on! →

  • Nonbulk Packaging

    Package that has the following characteristics: (a) maximum capacity of 119 gallons or less as a receptacle for a liquid (b) maximum net mass of 882 pounds or less or a maximum capacity of 119 gallons or less as a Read on! →

  • Noncombustible

    Incapable of supporting combustion under normal circumstances

  • Noncombustible

    Incapable of supporting combustion under normal circumstances

  • Nonconforming Apparatus

    Apparatus that does not conform to the standards set forth by NFPA standards.

  • norepinephrine

    A hormone and drug sometimes used in the treatment of shock. It produces vasoconstriction through its alpha stimulator properties (trade name

  • Normal Operating Pressure

    Amount of pressure that is expected to be available from a hydrant, prior to pumping

  • Normal Operating Pressure

    Amount of pressure that is expected to be available from a hydrant, prior to pumping

  • normal saline

    An intravenous solution containing 0.9% sodium chloride, used when volume replacement is desired.

  • normal sinus rhythm (NSR)

    The normal rhythm of the heart, wherein the excitation impulse arises in the SA node, travels through the internodal pathways to the AV junction, thence down the bundle of His, through the bundle branches, and into the Purkinje network without Read on! →

  • Nozzle

    A device attached to the end of a fire hose that directs, shapes and regulates the flow of the water or fire fighting agent pumped into the hose. May have a control valve. Can also be referred to as a Read on! →

  • Nozzle

    Appliance on the discharge end of a hoseline that forms a fire stream of definite shape, volume, and direction.

  • Nozzle Pressure

    Velocity pressure at which water is discharged from the nozzle.

  • Nozzle Reaction

    Counterforce directed against a person holding a nozzle or a device holding a nozzle by the velocity of water being discharged.

  • Nozzle tip

    Portion of firehose that forms the fire stream as it leaves the hose. Can be solid, fog, or other specialty nozzle (e.g., piercing, Bresnan cellar nozzle, wand tip, etc.).

  • NPO

    An abbreviation meaning "nothing by mouth".

  • NPSH

    National Pipe Straight Hose thread, also known as IPT (Iron Pipe Thread, or International Pipe Thread). Like NH threads, NPSH threads are commonly used in fire hose couplings, but the two types are not interchangeable with each other and cannot Read on! →

  • NSR

    An abbreviation for normal sinus rhythm.

  • Nurse Tender

    Very large mobile water supply apparatus that is stationed at the fire scene and serves as a portable reservoir rather than as a shuttle tender.