NFI CORE REVIEW CLASS EXAM QUESTIONS AND ANSWERS
4 Stages of combustion - CORRECT ANSWER✅✅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
ANSWER✅✅8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately - CORRECT
ANSWER✅✅500 degrees
The proper UL Standard for chimneys used to vent wood stoves is - CORRECT ANSWER✅✅UL103HT
UL103HT - CORRECT 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. - CORRECT
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. - CORRECT 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. -
CORRECT ANSWER✅✅2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees (from
vertical). - CORRECT 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 - CORRECT ANSWER✅✅66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides a __________
percent clearance reduction. - CORRECT 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. - CORRECT
ANSWER✅✅50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches. - CORRECT
ANSWER✅✅36"
What is UL 1618?
2 types of manufactured pads - CORRECT ANSWER✅✅Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
Type 1 floor protection - CORRECT ANSWER✅✅can be used on appliances that do not require thermal
protection
Type 2 floor protection - CORRECT ANSWER✅✅· for appliances req. to heave thermal protection
· must have an R value of 1.0
· R value must equal or exceed minimum R value needed
What is R-Value? - CORRECT ANSWER✅✅Measure of heat resistance
Gas products standards written by____________ - CORRECT ANSWER✅✅ANSI (American National
Standards Institute)
4 Stages of combustion - CORRECT ANSWER✅✅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
ANSWER✅✅8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately - CORRECT
ANSWER✅✅500 degrees
The proper UL Standard for chimneys used to vent wood stoves is - CORRECT ANSWER✅✅UL103HT
UL103HT - CORRECT 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. - CORRECT
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. - CORRECT 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. -
CORRECT ANSWER✅✅2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees (from
vertical). - CORRECT 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 - CORRECT ANSWER✅✅66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides a __________
percent clearance reduction. - CORRECT 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. - CORRECT
ANSWER✅✅50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches. - CORRECT
ANSWER✅✅36"
What is UL 1618?
2 types of manufactured pads - CORRECT ANSWER✅✅Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
Type 1 floor protection - CORRECT ANSWER✅✅can be used on appliances that do not require thermal
protection
Type 2 floor protection - CORRECT ANSWER✅✅· for appliances req. to heave thermal protection
· must have an R value of 1.0
· R value must equal or exceed minimum R value needed
What is R-Value? - CORRECT ANSWER✅✅Measure of heat resistance
Gas products standards written by____________ - CORRECT ANSWER✅✅ANSI (American National
Standards Institute)
