NFI Exam Study: Questions with

NFI Exam Study: Questions with

Complete Solutions (Latest 2025) Why use a gas hearth appliance? - Correct Answers ✅simulation of the flame and fuel of the solid fuel fireplace or stove. Combine the convenience and combustion efficiency of gas fuels with the aesthetics and tradition of wood burning.What are the requirements for COMBUSTION to take place? - Correct Answers ✅-Fuel - gas (natural gas or propane) -oxygen - air -Ignition - heat (flame, spark or hot-surface)

Section 1: Chapter 2 (2.2)

What causes incomplete combustion? - Correct Answers ✅1. Missing any of combustion requirements -ignition temperature, flammability limits, combustion ratio, heat value

• Incorrect inputs
• main burner orifice, type of fuel, fuel pressure
• Closing Air Shutter

Section 1 & 2: chapter 1 (1.2.2-1.2.3) & chapter 2 (2.1-

2.2.1.1) 1 / 2

NFI Exam Study: Questions with

Complete Solutions (Latest 2025) What are the results of incomplete combustion? - Correct Answers ✅- Poor appliance performance

• Sooting
• Carbon Monoxide
• Aldehydes

Section 1: Chapter 1 & 2

What are the dangers of (CO) carbon monoxide? - Correct Answers ✅- colorless, tasteless, toxic, combustible gas

• exposer can cause; headaches, fatigue, nausea, dizziness,

convulsions, death

• Effects can depend on; CO concentration, age, sex, health,

size of victim

Section 1: Chapter 2

What causes aldehydes, what characteristics, and how is it related to carbon monoxide? - Correct Answers ✅Results

from:

• flame impingement
• contaminated combustion ( dust, new carpet, paint,

furniture) Characteristics; strong, pungent odor

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