NFI Core Review Class Questions With Complete Solutions
4 Stages of combustion Correct Answers 1. Moisture
evaporation
2. Release of combustible gases
3. Ignition of combustible gas
4. Char burning
A masonry wall constructed directly against a combustible wall
can reduce appliance clearance by...? Correct Answers 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 Answers 50%
According to NFPA 211 and the IRC, a 3.5" brick wall with a 1"
ventilated air space provides a __________ percent clearance
reduction Correct Answers 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without
ventilated air space provides a __________ percent clearance
reduction. Correct Answers 33%
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 Answers
80%
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
Answers 50%
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 Answers 2 and 3
An opening is to be cut on an exterior wall of a house to
accommodate a masonry chimney. The inside surface of the
chimney is to be flush with the inside wall of the room. What is
the minimum opening size in the wall if the chimney is 24"
wide? Correct Answers 28"
ANSI Z21.50 Correct Answers This Standard applies to newly
produced vented decorative gas appliances
ANSI z21.8 Correct Answers This standard applies to the
installation of a conversion burner
ANSI Z21.9 Correct Answers Outdoor decorative appliances
ASTM E-1509 Correct Answers Standard specs for room
heaters and pellet fuel burning
Cannot reduce clearances to less than _________ unless tested
Minimum clearance can be less than that only with labeled
clearances Correct Answers 12"
Catalytic converters can lower the ignition temperature of wood
smoke to approximately Correct Answers 500 degrees
4 Stages of combustion Correct Answers 1. Moisture
evaporation
2. Release of combustible gases
3. Ignition of combustible gas
4. Char burning
A masonry wall constructed directly against a combustible wall
can reduce appliance clearance by...? Correct Answers 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 Answers 50%
According to NFPA 211 and the IRC, a 3.5" brick wall with a 1"
ventilated air space provides a __________ percent clearance
reduction Correct Answers 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without
ventilated air space provides a __________ percent clearance
reduction. Correct Answers 33%
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 Answers
80%
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
Answers 50%
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 Answers 2 and 3
An opening is to be cut on an exterior wall of a house to
accommodate a masonry chimney. The inside surface of the
chimney is to be flush with the inside wall of the room. What is
the minimum opening size in the wall if the chimney is 24"
wide? Correct Answers 28"
ANSI Z21.50 Correct Answers This Standard applies to newly
produced vented decorative gas appliances
ANSI z21.8 Correct Answers This standard applies to the
installation of a conversion burner
ANSI Z21.9 Correct Answers Outdoor decorative appliances
ASTM E-1509 Correct Answers Standard specs for room
heaters and pellet fuel burning
Cannot reduce clearances to less than _________ unless tested
Minimum clearance can be less than that only with labeled
clearances Correct Answers 12"
Catalytic converters can lower the ignition temperature of wood
smoke to approximately Correct Answers 500 degrees
