NFI Core Review Class Exam Questions With
Correct Answers.
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
4 Stages of combustion - 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____________ - 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
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%
The standard clearance to combustibles for an unlisted woodstove is ___________
inches. - ANSWER-36"
What is UL 1618?
2 types of manufactured pads - ANSWER-Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
Type 1 floor protection - ANSWER-can be used on appliances that do not require
thermal protection
Type 2 floor protection - 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
Correct Answers.
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
4 Stages of combustion - 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____________ - 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
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%
The standard clearance to combustibles for an unlisted woodstove is ___________
inches. - ANSWER-36"
What is UL 1618?
2 types of manufactured pads - ANSWER-Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
Type 1 floor protection - ANSWER-can be used on appliances that do not require
thermal protection
Type 2 floor protection - 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
