NFI CORE REVIEW CLASS EXAM 2025
QUESTIONS AND ANSWERS
4 Stages of combustion - ANS 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____________ -
ANS 8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately -
ANS 500 degrees
The proper UL Standard for chimneys used to vent wood stoves is - ANS UL103HT
UL103HT - ANS 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. -
ANS 50%
COPYRIGHT © 2025 BRAINBARTER ALL RIGHTS RESERVED 1
, 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. - ANS 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. - ANS 2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees
(from vertical). - ANS 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 - ANS 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides a
__________ percent clearance reduction. - ANS 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. -
ANS 50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches. -
ANS 36"
What is UL 1618?
2 types of manufactured pads - ANS Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
Type 1 floor protection - ANS can be used on appliances that do not require thermal
protection
COPYRIGHT © 2025 BRAINBARTER ALL RIGHTS RESERVED 2
QUESTIONS AND ANSWERS
4 Stages of combustion - ANS 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____________ -
ANS 8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately -
ANS 500 degrees
The proper UL Standard for chimneys used to vent wood stoves is - ANS UL103HT
UL103HT - ANS 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. -
ANS 50%
COPYRIGHT © 2025 BRAINBARTER ALL RIGHTS RESERVED 1
, 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. - ANS 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. - ANS 2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees
(from vertical). - ANS 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 - ANS 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides a
__________ percent clearance reduction. - ANS 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. -
ANS 50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches. -
ANS 36"
What is UL 1618?
2 types of manufactured pads - ANS Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
Type 1 floor protection - ANS can be used on appliances that do not require thermal
protection
COPYRIGHT © 2025 BRAINBARTER ALL RIGHTS RESERVED 2
