| Air
Shutter |
 |
| An opening in the tube
supplying gas to the burner. It draws primary air into
the tube and mixes it with the gas before the gas goes
to a main burner and is ignited. |
| |
| Air Wash |
|
| As the primary air enters
the firebox it is pre-heated and directed toward the glass
on the front door. The constant "washing" of
that hot air over the glass helps keep soot and creosote
from building up on the glass. One of the other key elements
to HearthStone’s clean glass technology is the use
of "Infrared Reflective Ceramic" glass. Used
in conjunction with the air wash, this glass helps keep
the glass clean for maximum fire enjoyment. |
| |
| Alcove |
|
| A recessed or built in
area of a room usually including both sides and top. |
| |
| B-Vent |
|
| Factory built, double-wall
metal pipe for venting gas appliances with draft hoods
and other appliances listed for use with Type B Gas Vent.
It consists of an aluminum inner wall and a galvanized
or galvalum outer wall with a dead air space between the
walls. |
| |
| Back
drafting (back puffing) |
|
| A term to describe the
condition when the flow of combustion products in a venting
system reverses direction. |
| |
| BTU (British
Thermal Unit) |
|
| The amount of energy it
takes to heat one pint of water one degree Fahrenheit. |
| |
| Carbon
Monoxide |
|
| A poisonous, combustible
gas formed by incomplete combustion of carbon or reduction
of carbon dioxide. |
| |
| Cast Iron |
|
| A material used in many
stoves. Iron is heated to a liquid form and poured into
molds, usually with decorative detailing. |
| |
| Catalytic
Combustor |
|
| A coated ceramic "honeycomb"
often used to reduce flue gas emissions. |
| |
| Chimney
Connector |
|
| The pipe that connects
a fuel-burning appliance to a chimney. |
| |
| Class
"A" Chimney |
|
| A residential type chimney
suitable for use at 1000ºF, which complies with the
optional 10-minute 2100ºF test. Such chimneys are
labeled as Type HT and are required for certain solid-fuel
applications. |
| |
| Close
Clearance Stove Pipe |
|
| A double wall stove pipe
usually consisting of an inner pipe, a small dead air
space and an outer pipe. Used as a chimney connector it
often reduces the necessary clearances to a combustible
surface considerable over single wall stove pipe. |
| |
| Coaxial
Venting System |
|
| A Direct-Vent venting system
using a larger outside diameter pipe for the fresh air
intake and a smaller diameter pipe inside the outer pipe
for exhaust gases. Usually the inside pipe is either 4"
or 5" in diameter while the outside pipe is either
6⅝" or 8" in diameter. |
| |
| Collinear
Venting System |
|
| A Direct-Vent venting system
using two separate pipes running next to each other. Normally
both pipes are either 3" or 4" in diameter. |
| |
| Combustible
Material |
|
| Material made of, or surfaced
with wood, compressed paper, plant fibers, plastics, or
other material that can ignite and burn, whether flame
proofed or not, whether plastered or unplastered. |
| |
| Convection |
|
| The transmission of heat
by air. Heated air rises and circulates. |
| |
| Creosote |
|
| Chimney and stove pipe
deposits originating as condensed wood smoke (including
vapors, tar and soot). Creosote is often initially liquid,
but may dry to pryrolze to a flaky or solid form. |
| |
| De-pressurization |
|
| A condition when the air
pressure in the home is less than the air pressure outside
the home. It can be caused by inadequate ventilation or
the use of other home appliances such as a furnace blower,
or an exhaust fan in the kitchen or bathroom. It leads
to back drafting or spillage in a conventional vent system.
Depressurization is common in new, tightly constructed
homes. |
| |
| Direct-Vent |
|
| A venting system in which
100% of the combustion air is drawn from the outside and
all the combustion products are returned to the outside. |
| |
| Double
Heat Exchanger: |
|
| What is a heat exchanger:
A heat exchanger helps to quickly transfer heat from
inside the firebox into the room, before the heat goes
up the chimney. The better and more numerous the heat
exchanger(s), the more efficient the stove.
What is a double heat exchanger?
Most gas-fired heaters have a single heat exchanger.
HearthStone gas stoves are unique in that they have
double heat exchangers. The first is the standard convective
air chamber surrounding the firebox. HearthStone’s
second heat exchanger consists of the massive, finned,
cast iron unit attached to this tag. The shorter set
of fins extend downwards into the firebox, directly
into the path of the flames. The longer fins face upwards,
directly into the path of convection air heating your
room.
What is the result? Our finned
cast iron heat exchanger helps to quickly and efficiently
transfer copious amounts of heat from the firebox into
the living space. The result is high efficiency and
maximum output for your heating dollar. |
| |
| Draft |
|
| The pressure difference
between the hot flue gases inside the venting system and
the cool air surrounding the venting system. |
| |
| EPA Phase
II |
|
| In 1988 the federal government
issued strict emission controls on woodstoves. These standards
were instituted in two phases. All stoves built after
July 1, 1992 must meat the stricter standards outlined
in the second phase of that regulation. |
| |
| Factory-Built
Chimney |
|
| A chimney composed of listed
factory-built components that is easy to assemble to form
the completed chimney. They conform to safety and building
codes. They are air cooled or insulated. Designed to remove
combustion by-products. |
| |
| Factory-Built
Fireplace |
|
| A fireplace composed of
listed, factory-built components assembled in accordance
with the terms of the listing. |
| |
| Fireplace
Insert |
|
| An appliance designed to
be installed within an existing fireplace. |
| |
| Glass |
|
| The window on the door(s)
of your HearthStone gas or wood stove is not actually
glass at all. It is a technologically advanced material,
able to withstand temperatures of over 200º F and
rapid temperature changes with no change in strength or
durability. |
| |
| Heat Life |
|
| The length of time a stove
stays hot after burning a load of fuel. |
| |
| Hearth
Extension |
|
| A noncombustible surfacing
applied to the floor area extending in front of and at
the side of the hearth opening of a fireplace or a fireplace
stove. |
| |
| Listed |
|
| Equipment, materials, or
services included in a list published by an organization
acceptable to the authority having jurisdiction. The listing
states either that the equipment, material or service
meets identified standards or has been tested and found
suitable for a specific purpose. |
| |
| Masonry
Chimney |
|
| A field-constructed chimney
of solid masonry units, including brick, stone, listed
masonry material, usually lined with fire clay flue liners. |
| |
| Millivolt
(Mv) |
|
| Unit of electromotive force
equal to one-thousandth of a volt. |
| |
| Negative
pressure |
|
| See depressurization |
| |
| NFPA 54 |
|
| National Fire Protection
Agency standard #54 "National Fuel Gas Code"
. |
| |
| NFPA 211 |
|
| National Fire Protection
Agency standard #211 "Standard for Chimneys, Fireplaces,
Vents and Solid Fuel-Burning Appliances 2000 Edition". |
| |
| Non-catalytic |
|
| Non-catalytic stoves have
a series of secondary air tubes under the baffle in the
top of the firebox. These tubes draw a precise amount
of heated air, inject it into the fire and actually cause
any particles in the smoke to burn. Consequently your
stove is helping to keep our environment clean while you
enjoy the benefit of more heat out of less wood. |
| |
| Noncombustible
Material |
|
| A material that, in the
form in which it is used and under the conditions anticipated,
does not ignite, burn, support combustion or release flammable
vapors, when subjected to fire or heat. |
| |
| Oxygen Depletion
Sensing (ODS) Pilot Assembly |
|
| A pilot burner found in
Vent-Free appliances, which can sense and respond to the
change in oxygen level. It consists of an orifice for
gas flow and a bimetallic air shutter, a thermocouple
and a spark electrode. Before the oxygen level reaches
18% the flame lifts off and causes the thermocouple to
cool shutting off the gas flow to the burners. |
| |
| Piezo
Electric Igniter |
|
| A device which delivers
an igniting spark by mean of pressure on a crystal. |
| |
| Regulator |
|
| A device for controlling
and maintaining a uniform outlet of gas pressure. Usually
part of a combination gas valve. |
| |
| Radiation |
|
| The transmission of heat
via radiant energy. |
| |
| Sealed
Combustion System |
|
| A Direct-Vent system. A
self-contained combustion system in which all the combustion
air is drawn from the outside and all the combustion product
is returned to the outside. The combustion system does
not interact with the home. |
| |
| Sediment
Trap (Drip leg) |
|
| A required part of every
gas installation, which allows a collection point for
moisture, and foreign particles (i.e. copper sulfide)
that may be in the gas. |
| |
| Spill
Switch |
|
| A heat activated safety
sensor, which detects flue gas flow reversal, which will
shut an appliance off. |
| |
| Steel
Stoves |
|
| Fabricated from flat stock.
Inexpensive material, limited style options. |
| |
| Soapstone |
|
| A metamorphic rock formed
millions of years ago under intense heat and pressure.
It evolved from a molten state deep within the earth with
an unusually stable composition. Unlike other stones,
it can withstand fire and dramatic changes in temperature.
Other stones, such as granite and marble, also hold and
radiate heat, but only soapstone is able to withstand
direct flames indefinitely. More |
| |
| Thermocouple |
|
| A device consisting of
two pieces of dissimilar metals joined together at one
end (hot junction). When the hot junction is heated, the
thermocouple produces DC Millivolts between 25-30 millivolts.
Used to power the gas safety valve. |
| |
| Thermopile |
|
| A number of thermocouples
connected in series to produce more DC Millivolts than
a single thermocouple. Depending on size the DC Millivolts
range between 250 and 750 millivolts. |
| |
| Thimble |
|
| Special metal or clay sleeves
for wall and ceiling penetrations when installing a venting
system to ensure that the proper clearance away from combustibles
is maintained. |
| |
| Vent-Free |
|
| Gas appliance systems where
all combustion byproducts (mostly water vapor and carbon
dioxide) are released into the same room environment as
the appliance. |
| |
| Water
Column (W.C.) |
|
| Unit of measurement for
gas pressure in inches of water. Approximately 28 inches
water column equals one psi. |
| |
| Zero-clearance
fireplace |
|
| See Factory-built
Fireplace. |
