USG Casting Fireplace Surrounds - Manual (Page 30)

Listed
Included in a list published by a
recognized testing laboratory or
inspection agency, indicating that
the equipment meets nationally
recognized safety standards.
Mantel or Mantelpiece
a) Flush Mantel—Another finishing
option for direct vent and ventless
fireplaces. It can be wood, marble,
plaster, or stone. The mantel does
not encase the entire fireplace, but
frames it, and is usually only 1-3/4
to 2-1/2 inches deep. Mantels are
used when the fireplace is installed
inside the wall or on the outside wall
of the house. b) Shelf over and
above the fireplace opening. c) The
finish around a fireplace, covering
the chimney-breast in front and
sometimes on both sides. The term
is especially applied to a shelf above
the fireplace, and its supports.
Manufacturer’s Installation
Instructions
Instructions and recommendations
for proper assembly, adjustment,
and installation of listed equipment.
Mechanical Sidewall Venting
Totally horizontal through-the-wall
venting of combustion by products
under positive pressure by means of
an electric fan. Commonly referred to
as direct vent, but termination condi-
tions differ. See Direct Vent.
NFPA
National Fire Protection Association,
Quincy, MA.
Noncombustible
(also see Incombustible)
Definition excerpted from the
ICBO/CC: Material of which no part
will ignite and burn when subjected
to fire. Also defined as a material
with a structural base of noncom-
bustible materials as defined, with
a surface not over 1/8
Љ thick that
has a flame spread rating of 50
or less. The term does not apply to
surface finish materials.
ODS (Oxygen Depletion Sensor)
A safety device that activates the
fire’s flame monitoring device in
case excessive levels of CO (carbon
monoxide) are detected.This reduces
the level of oxygen, causing the pilot
flame to become unstable and lift
off the thermocouple tip. The fire
then turns off automatically before
the situation becomes dangerous.
Radiant Heat
Heat that moves out in waves from a
central point and heats objects in its
path. The closer you get to a source
of radiant heat, the more heat you
will feel.
R-Value
A measure of how resistant a sub-
stance is to transferring heat.
Surround
The moulding which outlines an
object or opening.
Therm
100,000 British Thermal Units
(BTUs).
UL (also see Labeling Service)
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.
.
Vented Decorative Appliances
A vented appliance whose only func-
tion lies in the aesthetic effect of the
flames. Gas hearth appliances tested
to ANSI Standard Z.21.50 include
gas fireplaces, fireplace inserts, and
freestanding appliances.
Vent-Free or Ventless
Gas appliance with no need for a
flue. Although these units offer
high efficiency, some areas may
not permit their use. Please check
with your local building official.
Zero Clearance Fireplace
A factory-built fireplace that is con-
structed so that it can be placed
safely close to combustible mater-
ial. A Zero Clearance fireplace is
any firebox which has associated
ornamentation directly adjacent to
it without clearance or setbacks.
Glossary
30 Casting Fireplace Surrounds