USG Casting Fireplace Surrounds - Manual (Page 29)

Firebox
The portion of the solid fuel appli-
ance where the fuel is located and
where primary combustion occurs.
Fireplace
An enclosure, open in the front for
burning fuel. Solid fuel fireplaces
may contain and vent gas log sets or
fireplace inserts. Gas fireplaces are
metal appliances open in the front
and containing artificial log sets.
Fireplace Surround
The raised decorative moulding that
surrounds the opening to a firebox
or a marble, plaster, or tile frame
between the fireplace itself and the
wooden mantel.
Fire Resistance Rating
The time a material will withstand,
without igniting, flame and heat as
specified by code and specific test
conditions.
Floor Protector
Floor protectors are intended for use
with solid fuel heat producing appli-
ances for the reduction of the surface
temperature of combustible floor
materials. They are intended to be
placed over combustible floor con-
struction materials beneath and
adjacent to Listed fireplace stoves,
solid fuel room heaters, factory built
fireplaces, and fireplace inserts.
Gas Fireplace Insert
A gas appliance designed for installa-
tion within an existing fireplace.
Usually this consists of gas logs
within a metal enclosure surrounding
the logs and covering the space
between the insert and
the fireplace opening.
Gypsum Cement
A hydraulic cement made from
calcium sulfate hemi-hydrate.
Hearth
The floor of the firebox, most
commonly used in reference to fire-
places. More generally, the founda-
tion upon which fires for aesthetic
and heating purposes are built.
Differs from Floor Protection.
Hearth Extension
Noncombustible floor protection
extension beyond the opening of a
fireplace or stove. The term is also
sometimes used to denote the floor
protector under or around any resi-
dential solid fuel burning appliance.
Incombustible
(also see Noncombustible)
A material that will not burn when
subjected to fire. Specific use in the
building codes is limited to the types
and materials used in certain build-
ings. Defined as meeting criteria of
ASTM E136 “Standard Test Method
for Behavior of Materials in a
Vertical Tube Furnace at 750 °C”
This term does not apply to surface
finish materials.
Inserts
Heating units that retrofit into an exist-
ing masonry or factory-built fireplace.
Inserts burn wood, gas, or pellets.
K Value
Indicates the amount of BTUs of
heat that will flow in one hour through
one square foot of a uniform material
one inch thick for each degree
Fahrenheit of temperature rise.
Used in calculating floor protection
materials and thickness when one
noncombustible material is used.
Label Service (also see UL)
Program allowing a manufacturer
to place Underwriters Laboratories
Inc. labels on its products that have
met UL requirements. A UL repre-
sentative visits the manufacturing
site to obtain samples of the prod-
ucts for testing by UL. In some
cases, samples are also purchased
on the open market for testing. The
public is thereby assured that prod-
ucts bearing the UL label continually
meet UL specifications.
Lintel
A horizontal structural member,
such as a beam or stone that
spans an opening, as between the
uprights of a door or window or
between two columns or piers. The
area above the firebox.
29 Casting Fireplace Surrounds