NFI Core Review Class || QUESTIONS & ANSWERS
RATED 100% CORRECT!!
4 Stages of combustion correct answers 1. Moisture evaporation
2. Release of combustible gases
3. Ignition of combustible gas
4. Char burning
The total energy produced by burning one pound of wood is approximately____________
correct answers 8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately
correct answers 500 degrees
The proper UL Standard for chimneys used to vent wood stoves is correct answers UL103HT
UL103HT correct answers These requirements cover factory-built chimneys intended for
venting gas, liquid, and solid-fuel fired residential-type appliances and building heating
appliances
According to NFPA 211, the maximum horizontal run of a wood stove connector is limited to
______________ percent of the vertical portion of the chimney above the connector. correct
answers 50%
According to NFPA 211, a manual damper installed in a wood stove connector pipe cannot
block more than ___________ percent of the connector when fully closed. correct answers
80%
According to NFPA 211, the maximum permitted chimney flue area is ______ times the
appliance flue collar area for exterior chimneys and ____ times the appliance flue collar area
for interior chimneys. correct answers 2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees
(from vertical). correct answers 30 degrees
According to NFPA 211 and the IRC, a 3.5" brick wall with a 1" ventilated air space provides
a __________ percent clearance reduction correct answers 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides
a __________ percent clearance reduction. correct answers 33%
According to NFPA 211 and the IRC, a 24 gauge sheet metal panel with a 1" ventilated air
space provides a __________ percent clearance reduction when used as a ceiling protector.
correct answers 50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches.
correct answers 36"
What is UL 1618?
RATED 100% CORRECT!!
4 Stages of combustion correct answers 1. Moisture evaporation
2. Release of combustible gases
3. Ignition of combustible gas
4. Char burning
The total energy produced by burning one pound of wood is approximately____________
correct answers 8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately
correct answers 500 degrees
The proper UL Standard for chimneys used to vent wood stoves is correct answers UL103HT
UL103HT correct answers These requirements cover factory-built chimneys intended for
venting gas, liquid, and solid-fuel fired residential-type appliances and building heating
appliances
According to NFPA 211, the maximum horizontal run of a wood stove connector is limited to
______________ percent of the vertical portion of the chimney above the connector. correct
answers 50%
According to NFPA 211, a manual damper installed in a wood stove connector pipe cannot
block more than ___________ percent of the connector when fully closed. correct answers
80%
According to NFPA 211, the maximum permitted chimney flue area is ______ times the
appliance flue collar area for exterior chimneys and ____ times the appliance flue collar area
for interior chimneys. correct answers 2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees
(from vertical). correct answers 30 degrees
According to NFPA 211 and the IRC, a 3.5" brick wall with a 1" ventilated air space provides
a __________ percent clearance reduction correct answers 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides
a __________ percent clearance reduction. correct answers 33%
According to NFPA 211 and the IRC, a 24 gauge sheet metal panel with a 1" ventilated air
space provides a __________ percent clearance reduction when used as a ceiling protector.
correct answers 50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches.
correct answers 36"
What is UL 1618?
