NFI test questions and answers Newest RATED A+ 2025/2026 With complete solution

NFI test questions and answers Newest RATED A+
2025/2026 With complete solution
Which fuel type has a lower ignition temperature?
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Propane ignites between 920-1,120 degrees Fahrenheit Il` Il` Il` Il` Il` Il`




while natural gas ignites at 1,150 degrees Fahrenheit
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What is the significance of the differences in specific gravity between natural gas and propane?
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Propane falls and collects in lower areas of appliance or room Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




while natural gas rises into the atmosphere
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AD

What added safety feature is on all unvented gas appliances that is not found on vented
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appliances?
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Oxygen depletion system (ODS) that works with safety shutoff valve to stop fuel flow in event of
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low oxygen levels
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Which is a chemical compound with a strong pungent odor that occurs in incomplete or
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interrupted combustion?
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Aldehydes

Which of the following must be present in order for natural gas or propane to ignite?
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Heat

According to the chart below, I have listed four configurations one being invalid. Do you
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understand this graph?
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- 16" rise and 14" run
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- 9' rise and 10' run
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- 10'' rise and 14' run (invalid)
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-4' rise and 4' run
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, A 30,000 BTU appliance is installed at an elevation of 5,000 feet above sea level. The manufacturer
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requires a derating of 4% for each 1,000 feet above sea level for appliances installed higher than
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2000 feet above sea level. What is the proper BTU input of the appliance for this installation?
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24,000 BTUs Il`




(4% for each 1,000 ( 5 one thousands)
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1. 4x5 = 20 or 20%
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2. 30,000 BTUs x .20 = 6,000
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3. 30,000-6,000 = 24,000
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section 1: Chapter 2 (2.2.1.2.a) Il` Il` Il` Il`




According to the National Fuel Gas Code (NFPA 54), what is the maximum allowable BTU inputIl` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




rating for all gas appliances installed in a room measuring 12' x 12' x 10' if there are no provisions
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for outside air?
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28,800 BTU/hour Il`




1. 12'x12'x10' = 1,440 cubic feet
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2. 1,440 x 20 = 28,800
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(if you were trying to find minimum cubic feet you would take appliance input rating and divide by
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20)
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Section 3: Chapter 8 (8.1.2) Il` Il` Il` Il`




According to the National Fuel Gas Code (NFPA 54), which gas hearth system appliance can be
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installed in a bedroom or bathroom that is confined space?
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Direct vent Il`




section 2: Chapter 5 (5.2) Il` Il` Il` Il`




Which of the following is the most likely of a yellow flame impingement on a log set creating soot?
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Too much secondary air Il` Il` Il`




Section 1: Chapter 2 (2.1) Il` Il` Il` Il`