Page 64 - 2018_IFC

DEFINITIONS

HAZARDOUS PRODUCTION MATERIAL (HPM). A of this type of material shall be performed by experienced,
solid, liquid or gas associated with semiconductor manufac- technically competent persons.
turing that has a degree-of-hazard rating in health, flammabil- HIGHLY VOLATILE LIQUID. A liquefied compressed
ity or instability of Class 3 or 4 as ranked by NFPA 704 and gas with a boiling point of less than 68°F (20°C).
which is used directly in research, laboratory or production
processes which have, as their end product, materials that are HIGH-PILED COMBUSTIBLE STORAGE. Storage of
not hazardous. combustible materials in closely packed piles or combustible
materials on pallets, in racks or on shelves where the top of
HEALTH HAZARD. A classification of a chemical for storage is greater than 12 feet (3658 mm) in height. Where
which there is statistically significant evidence that acute or required by the fire code official, high-piled combustible stor-
chronic health effects are capable of occurring in exposed age also includes certain high-hazard commodities, such as
persons. The term “health hazard” includes chemicals that are rubber tires, Group A plastics, flammable liquids, idle pallets
toxic, highly toxic and corrosive. and similar commodities, where the top of storage is greater
HEAT DETECTOR. See “Detector, heat.” than 6 feet (1829 mm) in height.
[BG] HEIGHT, BUILDING. The vertical distance from HIGH-PILED STORAGE AREA. An area within a build-
grade plane to the average height of the highest roof surface. ing which is designated, intended, proposed or actually used
for high-piled combustible storage, including operating
HELIPORT. An area of land or water or a structural surface aisles.
that is used, or intended for use, for the landing and taking off
of helicopters, and any appurtenant areas which are used, or [BG] HIGH-RISE BUILDING. A building with an occu-
intended for use, for heliport buildings and other heliport pied floor located more than 75 feet (22 860 mm) above the
facilities. lowest level of fire department vehicle access.
HIGH-VOLTAGE TRANSMISSION LINE. An electrical
HELISTOP. The same as “Heliport,” except that fueling,
defueling, maintenance, repairs or storage of helicopters is power transmission line operating at or above 66 kilovolts.
not permitted. HIGHWAY. A public street, public alley or public road.
HI-BOY. A cart used to transport hot roofing materials on a [A] HISTORIC BUILDINGS. Any building or structure
roof. that is one or more of the following:
1. Listed, or certified as eligible for listing by the state
HIGHER EDUCATION LABORATORY. Laboratories in
historic preservation officer or the Keeper of the
Group B occupancies used for educational purposes above
the 12th grade. Storage, use and handling of chemicals in National Register of Historic Places, in the National
such laboratories shall be limited to purposes related to test- Register of Historic Places.
ing, analysis, teaching, research or developmental activities 2. Designated as historic under an applicable state or local
on a nonproduction basis. law.
3. Certified as a contributing resource within a national
HIGHLY TOXIC. A material which produces a lethal dose
or lethal concentration which falls within any of the follow- register, state designated or locally designated historic
ing categories: district.
HOGGED MATERIALS. Wood waste materials produced
1. A chemical that has a median lethal dose (LD ) of 50
50 from the lumber production process.
milligrams or less per kilogram of body weight when
administered orally to albino rats weighing between [M] HOOD. An air-intake device used to capture by entrap-
200 and 300 grams each. ment, impingement, adhesion or similar means, grease and
similar contaminants before they enter a duct system.
2. A chemical that has a median lethal dose (LD ) of 200
50 Type I. A kitchen hood for collecting and removing
milligrams or less per kilogram of body weight when
administered by continuous contact for 24 hours (or grease vapors and smoke.
less if death occurs within 24 hours) with the bare skin Type II. A general kitchen hood for collecting and remov-
of albino rabbits weighing between 2 and 3 kilograms ing steam vapor, heat, odors and products of combustion.
each. [BF] HORIZONTAL ASSEMBLY. A fire-resistance-rated

3. A chemical that has a median lethal concentration floor or roof assembly of materials designed to restrict the
(LC ) in air of 200 parts per million by volume or less spread of fire in which continuity is maintained.
50
of gas or vapor, or 2 milligrams per liter or less of mist, [BE] HORIZONTAL EXIT. An exit component consisting
fume or dust, when administered by continuous inhala- of fire-resistance-rated construction and opening protectives
tion for one hour (or less if death occurs within 1 hour) intended to compartmentalize portions of a building thereby
to albino rats weighing between 200 and 300 grams creating refuge areas that afford safety from fire and smoke
each. from the area of fire origin.
Mixtures of these materials with ordinary materials, such [BG] HOSPITALS AND PSYCHIATRIC HOSPITALS.
as water, might not warrant classification as highly toxic. Facilities that provide care or treatment for the medical, psy-
While this system is basically simple in application, any haz- chiatric, obstetrical, or surgical treatment of inpatient care
ard evaluation that is required for the precise categorization recipients that are incapable of self-preservation.

2018 INTERNATIONAL FIRE CODE ® 31
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