NFI Core Review Class Exam Questions Correctly
Answered
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
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%
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
What is R-Value? - Answer Measure of heat resistance
Gas products standards written by____________ - Answer ANSI (American National Standards Institute)
ANSI Z21.50 - Answer This Standard applies to newly produced vented decorative gas appliances
ANSI z21.8 - Answer This standard applies to the installation of a conversion burner
Answered
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
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%
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
What is R-Value? - Answer Measure of heat resistance
Gas products standards written by____________ - Answer ANSI (American National Standards Institute)
ANSI Z21.50 - Answer This Standard applies to newly produced vented decorative gas appliances
ANSI z21.8 - Answer This standard applies to the installation of a conversion burner
