NFI HEARTH SPECIALIST ACTUAL FINALS ANSWERS
AND QUESTIONS SET A+
✔✔Fire Chamber - ✔✔see firebox
✔✔Fire Resistance Rating - ✔✔the time a material will withstand, without igniting, flame
and heat as specified by code and specific test conditions
✔✔Firebox - ✔✔that portion of the solid fuel appliance where the fuel is located and
where primary combustion occurs
✔✔Firebrick - ✔✔heat resistant brick used in fireboxes; withstands very high
temperatures
✔✔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 Insert - ✔✔solid fuel appliance designed to be installed partially or fully in
the fire chamber of a masonry fireplace, and that vents into the fireplace chimney by
means of full relining or appliance to flue methods
✔✔Firestop - ✔✔a noncombustible barrier. often metal, placed to span the air space
between the outer walls of chimneys and surrounding combustibles; serves to resist the
spread of fire between floors of a structure
✔✔Flame Impingement - ✔✔the "striking" of flame against an object, such as "flame
impingement on the catalytic combustor"
✔✔Flame Rectification - ✔✔means to ensure gas shutoff in the absence of flame in
electronic ignition systems. alternating current applied to an electrode engulfed in the
pilot or burner flame is rectified, or changed to direct current, to power a control module
to maintain a gas flow until the flame is extinguished
,✔✔Flammability Limits - ✔✔minimum and maximum amounts of fuel (expressed as a
percentage) in an air and fuel mixture within which combustion can take place
✔✔Flashing - ✔✔also known as roof jack. device that covers a factory- built chimney
roof penetration and that helps stabilize the chimney
✔✔Floor Protection - ✔✔Noncombustible material of specified size, thickness, material
and conductivity placed under a solid fuel appliance; required to extend beyond the four
sides of the appliance. serves to protect combustible floor surfaces and framing. differs
from hearth
✔✔Flue - ✔✔the passageway in a chimney for conveying flue gases to the outside
atmosphere
✔✔Flue Collar - ✔✔the part of the solid fuel appliance that accepts the chimney
connector. the flue collar diameter or dimension is designed by the appliance
manufacturer to adequately accommodate the flow of gases out of the appliance
✔✔Flue Gases - ✔✔all combustible and noncombustible gases (plus excess air) that
exit the solid fuel appliance
✔✔Flue Liner - ✔✔that portion of the chimney that contains the flue gases; is separated
from the interior of the masonry chimney wall by an air space. Term refers to materials
used with masonry chimneys, including clay tile, stainless steel, and poured materials;
also referred to as liner and tile
✔✔Fractionating - ✔✔extraction of impurities and hydrocarbons from wet and natural
gas
✔✔Freestanding Gas Appliance - ✔✔an appliance with gas burning log set that has the
appearance of a solid fuel appliance that is placed away from walls in a dwelling
✔✔Full Relining - ✔✔a means of venting a solid fuel appliance (including fireplace
inserts) into fireplace chimneys; the listed liner extends from the appliance out of the top
of the chimney and includes insulation and components in accordance with the terms of
the listing. Also referred to as positive connection
✔✔Furnace - ✔✔a central heating appliance that supplies hot air, through ducts, to the
house
✔✔Gable - ✔✔the end, upper, triangular area of a home, beneath the roof
, ✔✔Gas Control Knob Assmebly - ✔✔Part of the gas control valve that is a multi-
positioned and tapered valve designed to allow or shut off gas supply to the appliance.
also know as gas cock assembly
✔✔Gas Logs - ✔✔an open flame type appliance consisting of a burner and metal pan
or base supporting simulated logs. may include various ember media
✔✔Gas Vent - ✔✔a factory-made, listed venting system designed to remove flue gases
to the outside atmosphere. see direct vent and type B vent
✔✔Gravity Ducting - ✔✔movement of heated air by non-mechanical means. rising
warm air travels to heat register higher than heat source and flows back as it cools and
falls
✔✔Gravity Vent - ✔✔type of venting that uses the natural draft of a column of warm
gases rising due to the pressure of surrounding cooler air
✔✔Header - ✔✔a beam placed horizontal above doors, windows, or other openings to
carry the weight of structural loads
✔✔Hearth - ✔✔the floor of the firebox, most commonly used in reference to fireplaces.
More generally, the foundation upon which for aesthetic and heating purposes are built.
differs from floor protection
✔✔Hearth Extension - ✔✔noncombustible floor protection in front of and to the sides of
a fireplace hearth
✔✔Heat Loss Calculation - ✔✔calculation to determine house BTU loss; factors include
conduction through construction materials, air infiltration losses and the difference
between actual or projected outside temperatures and desired temperature inside the
house. used for determining necessary heat output from the heating appliance
✔✔Heat Output - ✔✔the amount of usable heat produced by a heating appliance;
expressed in BTU (for solid fuel and most conventional fuel appliances)
✔✔Heat Recovery Ventilator (HRV) - ✔✔mechanical system that uses blowers and an
air to air heat exchanger to replace indoor air with preheated outdoor air
✔✔Heat Value - ✔✔Amount of heat potential of one cubic foot of gas when burned. also
known as caloric value
✔✔Higher Heating Value (HHV) - ✔✔the amount of heat released by a specific quantity
of fuel after it is combusted and the products have returned to their pre-combustion
AND QUESTIONS SET A+
✔✔Fire Chamber - ✔✔see firebox
✔✔Fire Resistance Rating - ✔✔the time a material will withstand, without igniting, flame
and heat as specified by code and specific test conditions
✔✔Firebox - ✔✔that portion of the solid fuel appliance where the fuel is located and
where primary combustion occurs
✔✔Firebrick - ✔✔heat resistant brick used in fireboxes; withstands very high
temperatures
✔✔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 Insert - ✔✔solid fuel appliance designed to be installed partially or fully in
the fire chamber of a masonry fireplace, and that vents into the fireplace chimney by
means of full relining or appliance to flue methods
✔✔Firestop - ✔✔a noncombustible barrier. often metal, placed to span the air space
between the outer walls of chimneys and surrounding combustibles; serves to resist the
spread of fire between floors of a structure
✔✔Flame Impingement - ✔✔the "striking" of flame against an object, such as "flame
impingement on the catalytic combustor"
✔✔Flame Rectification - ✔✔means to ensure gas shutoff in the absence of flame in
electronic ignition systems. alternating current applied to an electrode engulfed in the
pilot or burner flame is rectified, or changed to direct current, to power a control module
to maintain a gas flow until the flame is extinguished
,✔✔Flammability Limits - ✔✔minimum and maximum amounts of fuel (expressed as a
percentage) in an air and fuel mixture within which combustion can take place
✔✔Flashing - ✔✔also known as roof jack. device that covers a factory- built chimney
roof penetration and that helps stabilize the chimney
✔✔Floor Protection - ✔✔Noncombustible material of specified size, thickness, material
and conductivity placed under a solid fuel appliance; required to extend beyond the four
sides of the appliance. serves to protect combustible floor surfaces and framing. differs
from hearth
✔✔Flue - ✔✔the passageway in a chimney for conveying flue gases to the outside
atmosphere
✔✔Flue Collar - ✔✔the part of the solid fuel appliance that accepts the chimney
connector. the flue collar diameter or dimension is designed by the appliance
manufacturer to adequately accommodate the flow of gases out of the appliance
✔✔Flue Gases - ✔✔all combustible and noncombustible gases (plus excess air) that
exit the solid fuel appliance
✔✔Flue Liner - ✔✔that portion of the chimney that contains the flue gases; is separated
from the interior of the masonry chimney wall by an air space. Term refers to materials
used with masonry chimneys, including clay tile, stainless steel, and poured materials;
also referred to as liner and tile
✔✔Fractionating - ✔✔extraction of impurities and hydrocarbons from wet and natural
gas
✔✔Freestanding Gas Appliance - ✔✔an appliance with gas burning log set that has the
appearance of a solid fuel appliance that is placed away from walls in a dwelling
✔✔Full Relining - ✔✔a means of venting a solid fuel appliance (including fireplace
inserts) into fireplace chimneys; the listed liner extends from the appliance out of the top
of the chimney and includes insulation and components in accordance with the terms of
the listing. Also referred to as positive connection
✔✔Furnace - ✔✔a central heating appliance that supplies hot air, through ducts, to the
house
✔✔Gable - ✔✔the end, upper, triangular area of a home, beneath the roof
, ✔✔Gas Control Knob Assmebly - ✔✔Part of the gas control valve that is a multi-
positioned and tapered valve designed to allow or shut off gas supply to the appliance.
also know as gas cock assembly
✔✔Gas Logs - ✔✔an open flame type appliance consisting of a burner and metal pan
or base supporting simulated logs. may include various ember media
✔✔Gas Vent - ✔✔a factory-made, listed venting system designed to remove flue gases
to the outside atmosphere. see direct vent and type B vent
✔✔Gravity Ducting - ✔✔movement of heated air by non-mechanical means. rising
warm air travels to heat register higher than heat source and flows back as it cools and
falls
✔✔Gravity Vent - ✔✔type of venting that uses the natural draft of a column of warm
gases rising due to the pressure of surrounding cooler air
✔✔Header - ✔✔a beam placed horizontal above doors, windows, or other openings to
carry the weight of structural loads
✔✔Hearth - ✔✔the floor of the firebox, most commonly used in reference to fireplaces.
More generally, the foundation upon which for aesthetic and heating purposes are built.
differs from floor protection
✔✔Hearth Extension - ✔✔noncombustible floor protection in front of and to the sides of
a fireplace hearth
✔✔Heat Loss Calculation - ✔✔calculation to determine house BTU loss; factors include
conduction through construction materials, air infiltration losses and the difference
between actual or projected outside temperatures and desired temperature inside the
house. used for determining necessary heat output from the heating appliance
✔✔Heat Output - ✔✔the amount of usable heat produced by a heating appliance;
expressed in BTU (for solid fuel and most conventional fuel appliances)
✔✔Heat Recovery Ventilator (HRV) - ✔✔mechanical system that uses blowers and an
air to air heat exchanger to replace indoor air with preheated outdoor air
✔✔Heat Value - ✔✔Amount of heat potential of one cubic foot of gas when burned. also
known as caloric value
✔✔Higher Heating Value (HHV) - ✔✔the amount of heat released by a specific quantity
of fuel after it is combusted and the products have returned to their pre-combustion
