NFI Test Correctly Answered
4 Stages of combustion - ✅✅ 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____________ - ✅✅ 8,600 btus
Catalytic converters can lower the ignition temperature of wood smoke to
approximately - ✅✅ 500 degrees
The proper UL Standard for chimneys used to vent wood stoves is - ✅✅
UL103HT
UL103HT - ✅✅ 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. - ✅✅ 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. - ✅✅ 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. - ✅✅ 2 and 3
The maximum chimney offset angle permitted in the United States is __________
degrees (from vertical). - ✅✅ 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 - ✅✅ 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space
provides a __________ percent clearance reduction. - ✅✅ 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. - ✅✅ 50%
The standard clearance to combustibles for an unlisted woodstove is ___________
inches. - ✅✅ 36"
What is UL 1618?
2 types of manufactured pads - ✅✅ Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
4 Stages of combustion - ✅✅ 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____________ - ✅✅ 8,600 btus
Catalytic converters can lower the ignition temperature of wood smoke to
approximately - ✅✅ 500 degrees
The proper UL Standard for chimneys used to vent wood stoves is - ✅✅
UL103HT
UL103HT - ✅✅ 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. - ✅✅ 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. - ✅✅ 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. - ✅✅ 2 and 3
The maximum chimney offset angle permitted in the United States is __________
degrees (from vertical). - ✅✅ 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 - ✅✅ 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space
provides a __________ percent clearance reduction. - ✅✅ 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. - ✅✅ 50%
The standard clearance to combustibles for an unlisted woodstove is ___________
inches. - ✅✅ 36"
What is UL 1618?
2 types of manufactured pads - ✅✅ Floor protection
1. Type 1. Ember protection
2. Type 2 thermal floor protection
