NFI HEARTH SPECIALIST CORRECT EXAMS
ANSWERS AND QUESTIONS SET A+
✔✔Methane - ✔✔main constituent of natural gas. chemical formula CH4
✔✔Millivolt (mv) - ✔✔unit of electromotive force equal to one one-thousandth of a volt
✔✔Mobile Home Appliance - ✔✔Solid fuel appliance specifically designed to meet HUD
standards for installation into mobile homes. includes outside combustion air, floor
mountings, substantially reduced clearances, and designated venting systems
✔✔Moisture Content - ✔✔the percentage of the fuel's weight that is water in
comparison to the total weight of the water and wood in the wet method; in comparison
to the weight of the oven dried fuel in the dry basis
✔✔Multimeter - ✔✔a device consisting of one or more meters used to measure two or
more electrical quantities in an electrical circuit, such as voltage, resistance, and current
✔✔Mixer - ✔✔component of a main burner where gas mixes with air. consists of mixer
face, mixer head, and mixing tube (venturi)
✔✔National Fuel Gas Code (ANSI Z23.1, NFPA 54) - ✔✔a standard for the installation
of gas appliances, piping and venting
✔✔Natural Gas - ✔✔colorless, highly flammable gas found porous geologic formations
beneath the earth's surface. consists mainly of methane
✔✔Non Load Bearing Wall - ✔✔a wall that supports no load other than its own weight
✔✔Noncombustible - ✔✔a material that, in the form it is used and under the conditions
anticipated, will not ignite, burn, support combustion, or release flammable vapors when
subjected to fire or heat
, ✔✔Odorant - ✔✔material added to natural gas or propane in small concentrations to
impart a detectably distinct odor. usually mercaptans
✔✔Orifice - ✔✔the opening in a cap, spud, or other device whereby the flow of gas is
limited and/or controlled and through which the gas is discharged to either a pilot burner
or main burner
✔✔Orifice Spud - ✔✔a removable plug or cap containing an orifice
✔✔Oven Dry Wood - ✔✔wood dried at 217 degrees Fahrenheit to a constant weight;
defined as having "zero moisture content"
✔✔Opacity - ✔✔thickness of smoke. an indicator of combustion efficiency
✔✔Parapet - ✔✔a low protective wall along the edge of a roof
✔✔Particulate Matter - ✔✔tiny pieces of condensable hydrocarbons in solid or liquid
form. the basis of solid fuel emissions regulations of the Environmental Protection
Agency
✔✔Partition - ✔✔the masonry wall that must separate flue liners in a masonry chimney.
also referred to as Wythe
✔✔Pascal (Pa) - ✔✔the metric unit of measurement for pressures. one Pa equals 0.004
inches of water column (WC)
✔✔Plumb - ✔✔exactly vertical (perpendicular to a level horizontal surface)
✔✔Piezo Starter - ✔✔a device that delivers an igniting spark by means of pressure on a
crystal
✔✔Pilot - ✔✔a small flame used to ignite the gas at the main burner. may be standing
(constantly burning) or intermittent (on and during demand for heat)
✔✔Pilot Safety Shutoff Systm - ✔✔a component of the pilot or the gas control valve that
allows or shuts off gas flow on the basis of the presence or absence of flame. consists
of a u-shaped electromagnet (see solenoid), gas shutoff disc, tension spring, keeper
plate, thermocouple/thermopile connection, and reset button. also known as millivolt
system
✔✔Pressure Adjustment Screw - ✔✔part of a pressure regulator located directly under
a cap screw on top of the regulator. means of adjusting gas pressure on some
regulators. Note: some pressure regulators are not subject to adjustment. check
manufacturer's instructions
ANSWERS AND QUESTIONS SET A+
✔✔Methane - ✔✔main constituent of natural gas. chemical formula CH4
✔✔Millivolt (mv) - ✔✔unit of electromotive force equal to one one-thousandth of a volt
✔✔Mobile Home Appliance - ✔✔Solid fuel appliance specifically designed to meet HUD
standards for installation into mobile homes. includes outside combustion air, floor
mountings, substantially reduced clearances, and designated venting systems
✔✔Moisture Content - ✔✔the percentage of the fuel's weight that is water in
comparison to the total weight of the water and wood in the wet method; in comparison
to the weight of the oven dried fuel in the dry basis
✔✔Multimeter - ✔✔a device consisting of one or more meters used to measure two or
more electrical quantities in an electrical circuit, such as voltage, resistance, and current
✔✔Mixer - ✔✔component of a main burner where gas mixes with air. consists of mixer
face, mixer head, and mixing tube (venturi)
✔✔National Fuel Gas Code (ANSI Z23.1, NFPA 54) - ✔✔a standard for the installation
of gas appliances, piping and venting
✔✔Natural Gas - ✔✔colorless, highly flammable gas found porous geologic formations
beneath the earth's surface. consists mainly of methane
✔✔Non Load Bearing Wall - ✔✔a wall that supports no load other than its own weight
✔✔Noncombustible - ✔✔a material that, in the form it is used and under the conditions
anticipated, will not ignite, burn, support combustion, or release flammable vapors when
subjected to fire or heat
, ✔✔Odorant - ✔✔material added to natural gas or propane in small concentrations to
impart a detectably distinct odor. usually mercaptans
✔✔Orifice - ✔✔the opening in a cap, spud, or other device whereby the flow of gas is
limited and/or controlled and through which the gas is discharged to either a pilot burner
or main burner
✔✔Orifice Spud - ✔✔a removable plug or cap containing an orifice
✔✔Oven Dry Wood - ✔✔wood dried at 217 degrees Fahrenheit to a constant weight;
defined as having "zero moisture content"
✔✔Opacity - ✔✔thickness of smoke. an indicator of combustion efficiency
✔✔Parapet - ✔✔a low protective wall along the edge of a roof
✔✔Particulate Matter - ✔✔tiny pieces of condensable hydrocarbons in solid or liquid
form. the basis of solid fuel emissions regulations of the Environmental Protection
Agency
✔✔Partition - ✔✔the masonry wall that must separate flue liners in a masonry chimney.
also referred to as Wythe
✔✔Pascal (Pa) - ✔✔the metric unit of measurement for pressures. one Pa equals 0.004
inches of water column (WC)
✔✔Plumb - ✔✔exactly vertical (perpendicular to a level horizontal surface)
✔✔Piezo Starter - ✔✔a device that delivers an igniting spark by means of pressure on a
crystal
✔✔Pilot - ✔✔a small flame used to ignite the gas at the main burner. may be standing
(constantly burning) or intermittent (on and during demand for heat)
✔✔Pilot Safety Shutoff Systm - ✔✔a component of the pilot or the gas control valve that
allows or shuts off gas flow on the basis of the presence or absence of flame. consists
of a u-shaped electromagnet (see solenoid), gas shutoff disc, tension spring, keeper
plate, thermocouple/thermopile connection, and reset button. also known as millivolt
system
✔✔Pressure Adjustment Screw - ✔✔part of a pressure regulator located directly under
a cap screw on top of the regulator. means of adjusting gas pressure on some
regulators. Note: some pressure regulators are not subject to adjustment. check
manufacturer's instructions
