NFI test questions and answers with
solutions
Which fuel type has a lower ignition temperature?
Propane ignites between 920-1,120 degrees Fahrenheit
while natural gas ignites at 1,150 degrees Fahrenheit
What is the significance of the differences in specific gravity between natural gas and propane?
Propane falls and collects in lower areas of appliance or room
while natural gas rises into the atmosphere
What added safety feature is on all unvented gas appliances that is not found on vented
appliances?
Oxygen depletion system (ODS) that works with safety shutoff valve to stop fuel flow in event
of low oxygen levels
Which is a chemical compound with a strong pungent odor that occurs in incomplete or
interrupted combustion?
Aldehydes
Which of the following must be present in order for natural gas or propane to ignite?
Heat
According to the chart below, I have listed four configurations one being invalid. Do you
understand this graph?
- 16" rise and 14" run
- 9' rise and 10' run
- 10'' rise and 14' run (invalid)
-4' rise and 4' run
, A 30,000 BTU appliance is installed at an elevation of 5,000 feet above sea level. The
manufacturer requires a derating of 4% for each 1,000 feet above sea level for appliances
installed higher than 2000 feet above sea level. What is the proper BTU input of the appliance
for this installation?
24,000 BTUs
(4% for each 1,000 ( 5 one thousands)
1. 4x5 = 20 or 20%
2. 30,000 BTUs x .20 = 6,000
3. 30,000-6,000 = 24,000
section 1: Chapter 2 (2.2.1.2.a)
According to the National Fuel Gas Code (NFPA 54), what is the maximum allowable BTU input
rating for all gas appliances installed in a room measuring 12' x 12' x 10' if there are no
provisions for outside air?
28,800 BTU/hour
1. 12'x12'x10' = 1,440 cubic feet
2. 1,440 x 20 = 28,800
(if you were trying to find minimum cubic feet you would take appliance input rating and divide
by 20)
Section 3: Chapter 8 (8.1.2)
According to the National Fuel Gas Code (NFPA 54), which gas hearth system appliance can be
installed in a bedroom or bathroom that is confined space?
Direct vent
section 2: Chapter 5 (5.2)
Which of the following is the most likely of a yellow flame impingement on a log set creating
soot?
Too much secondary air
Section 1: Chapter 2 (2.1)
solutions
Which fuel type has a lower ignition temperature?
Propane ignites between 920-1,120 degrees Fahrenheit
while natural gas ignites at 1,150 degrees Fahrenheit
What is the significance of the differences in specific gravity between natural gas and propane?
Propane falls and collects in lower areas of appliance or room
while natural gas rises into the atmosphere
What added safety feature is on all unvented gas appliances that is not found on vented
appliances?
Oxygen depletion system (ODS) that works with safety shutoff valve to stop fuel flow in event
of low oxygen levels
Which is a chemical compound with a strong pungent odor that occurs in incomplete or
interrupted combustion?
Aldehydes
Which of the following must be present in order for natural gas or propane to ignite?
Heat
According to the chart below, I have listed four configurations one being invalid. Do you
understand this graph?
- 16" rise and 14" run
- 9' rise and 10' run
- 10'' rise and 14' run (invalid)
-4' rise and 4' run
, A 30,000 BTU appliance is installed at an elevation of 5,000 feet above sea level. The
manufacturer requires a derating of 4% for each 1,000 feet above sea level for appliances
installed higher than 2000 feet above sea level. What is the proper BTU input of the appliance
for this installation?
24,000 BTUs
(4% for each 1,000 ( 5 one thousands)
1. 4x5 = 20 or 20%
2. 30,000 BTUs x .20 = 6,000
3. 30,000-6,000 = 24,000
section 1: Chapter 2 (2.2.1.2.a)
According to the National Fuel Gas Code (NFPA 54), what is the maximum allowable BTU input
rating for all gas appliances installed in a room measuring 12' x 12' x 10' if there are no
provisions for outside air?
28,800 BTU/hour
1. 12'x12'x10' = 1,440 cubic feet
2. 1,440 x 20 = 28,800
(if you were trying to find minimum cubic feet you would take appliance input rating and divide
by 20)
Section 3: Chapter 8 (8.1.2)
According to the National Fuel Gas Code (NFPA 54), which gas hearth system appliance can be
installed in a bedroom or bathroom that is confined space?
Direct vent
section 2: Chapter 5 (5.2)
Which of the following is the most likely of a yellow flame impingement on a log set creating
soot?
Too much secondary air
Section 1: Chapter 2 (2.1)
