NFI CORE KNOWLEDGE ACTUAL EXAM PAPER 2026 QUESTIONS WITH ANSWERS GRADED A+

NFI CORE KNOWLEDGE ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS GRADED
A+


◉The total energy produced by burning one pound of wood is
approximately____________ . Answer: 8,600 BTUs


◉Catalytic converters can lower the ignition temperature of wood
smoke to approximately . Answer: 500 degrees


◉The proper UL Standard for chimneys used to vent wood stoves is .
Answer: UL103HT


◉UL103HT . Answer: 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. . Answer: 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. . Answer: 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. . Answer:
2 and 3


◉The maximum chimney offset angle permitted in the United States is
__________ degrees (from vertical). . Answer: 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 .
Answer: 66%


◉According to NFPA 211 and the IRC, a 3.5" brick wall without
ventilated air space provides a __________ percent clearance reduction.
. Answer: 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. . Answer: 50%