NFI Core Review Class Flashcards
31 Questions
100 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the 4 stages of combustion?

  • Char burning (correct)
  • Moisture evaporation (correct)
  • Ignition of combustible gas (correct)
  • Release of combustible gases (correct)

    • What is the total energy produced by burning one pound of wood?

    8,600 BTUs

    What is the ignition temperature of wood smoke when using catalytic converters?

    500 degrees

    What is the proper UL Standard for chimneys used to vent wood stoves?

    <p>UL103HT</p> Signup and view all the answers

    What do the UL103HT requirements cover?

    <p>Factory-built chimneys for gas, liquid, and solid-fuel fired appliances</p> Signup and view all the answers

    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.

    <p>50%</p> Signup and view all the answers

    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.

    <p>80%</p> Signup and view all the answers

    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.

    <p>2 and 3</p> Signup and view all the answers

    The maximum chimney offset angle permitted in the United States is __________ degrees (from vertical).

    <p>30 degrees</p> Signup and view all the answers

    According to NFPA 211 and the IRC, a 3.5" brick wall with a 1" ventilated air space provides a __________ percent clearance reduction.

    <p>66%</p> Signup and view all the answers

    According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides a __________ percent clearance reduction.

    <p>33%</p> Signup and view all the answers

    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.

    <p>50%</p> Signup and view all the answers

    The standard clearance to combustibles for an unlisted wood stove is ___________ inches.

    <p>36</p> Signup and view all the answers

    What is UL 1618?

    <p>2 types of manufactured pads</p> Signup and view all the answers

    What is Type 1 floor protection?

    <p>Can be used on appliances that do not require thermal protection</p> Signup and view all the answers

    What is Type 2 floor protection?

    <p>For appliances requiring thermal protection and must have an R value of 1.0</p> Signup and view all the answers

    What is R-value?

    <p>Measure of heat resistance</p> Signup and view all the answers

    Who writes gas products standards?

    <p>ANSI (American National Standards Institute)</p> Signup and view all the answers

    What does ANSI Z21.50 apply to?

    <p>Newly produced vented decorative gas appliances</p> Signup and view all the answers

    What does ANSI Z21.8 cover?

    <p>Installation of a conversion burner</p> Signup and view all the answers

    What does ANSI Z21.9 refer to?

    <p>Outdoor decorative appliances</p> Signup and view all the answers

    What does ASTM E-1509 represent?

    <p>Standard specs for room heaters and pellet fuel burning</p> Signup and view all the answers

    What are the emission limits in the New Source Performance Standard (NSPS) for catalytic and non-catalytic woodstoves?

    <p>4.5 grams/hour and 7.5 grams/hour</p> Signup and view all the answers

    According to NSPS, what are the two phases for woodstoves?

    <p>Current: 4.5 grams/hour and by 2020: 2.5 grams/hour with cord wood, 2.0 grams/hour with crib wood</p> Signup and view all the answers

    What are the principles of draft and flow?

    <p>Exhaust flue gases to outside, protects home from hot gases and sparks, causes combustion air to be drawn in</p> Signup and view all the answers

    What is natural draft?

    <p>Force that moves air into the appliance and combustion byproducts out due to temperature differences</p> Signup and view all the answers

    What is flow in the context of chimney systems?

    <p>Volume of gases that pass through venting system as a result of draft</p> Signup and view all the answers

    What is a house stack effect?

    <p>Heated portion of the house taller than vent termination creates a greater chimney effect</p> Signup and view all the answers

    What is mechanical draft?

    <p>Can correct venting issues and is listed and installed according to instructions</p> Signup and view all the answers

    Draft gauges are measured in____________.

    <p>Water Column Inches</p> Signup and view all the answers

    What is the chimney connector pipe?

    <p>The pipe coming off the appliance and connecting to the chimney</p> Signup and view all the answers

    Study Notes

    Combustion Stages

    • Four stages of combustion: moisture evaporation, release of combustible gases, ignition of combustible gas, and char burning.

    Energy Production

    • Burning one pound of wood generates approximately 8,600 BTUs.

    Ignition Temperature

    • Catalytic converters can reduce the ignition temperature of wood smoke to around 500 degrees.

    UL Standards for Chimneys

    • Proper UL Standard for chimneys venting wood stoves is UL103HT.

    UL103HT Details

    • Covers factory-built chimneys for venting gas, liquid, and solid-fuel residential-type appliances.

    Wood Stove Connector Limitations

    • Maximum horizontal run of a wood stove connector is limited to 50% of the vertical chimney portion above the connector.

    Manual Damper Regulations

    • A manual damper in a wood stove connector pipe must not block more than 80% of the connector when fully closed.

    Chimney Flue Area Regulations

    • Maximum chimney flue area: 2 times the appliance flue collar area for exterior chimneys; 3 times for interior chimneys.

    Chimney Offset Angle

    • Maximum permitted chimney offset angle in the U.S. is 30 degrees from vertical.

    Clearance Reduction Specifications

    • A 3.5" brick wall with 1" ventilated air space provides a 66% clearance reduction.
    • A 3.5" brick wall without ventilated air space provides a 33% clearance reduction.
    • A 24 gauge sheet metal panel with 1" ventilated air space offers a 50% clearance reduction as a ceiling protector.

    Clearance to Combustibles

    • Standard clearance to combustibles for unlisted wood stoves is 36 inches.

    UL 1618 Understanding

    • UL 1618 provides two types of manufactured pads for floor protection: Type 1 for ember protection; Type 2 for thermal protection (requires an R value of 1.0).

    R-Value Definition

    • R-Value measures heat resistance, indicating thermal efficiency.

    Gas Product Standards

    • Gas product standards are outlined by ANSI (American National Standards Institute).

    ANSI Standards Overview

    • ANSI Z21.50: Standards for newly produced vented decorative gas appliances.
    • ANSI Z21.8: Standards for installation of conversion burners.
    • ANSI Z21.9: Standards for outdoor decorative appliances.

    Room Heater Standards

    • ASTM E-1509 specifies standards for room heaters and pellet fuel burning.

    Emission Limits under NSPS

    • New Source Performance Standard emission limits set: 4.5 grams/hour for catalytic stoves and 7.5 grams/hour for non-catalytic stoves.

    NSPS Phases for Woodstoves

    • NSPS consists of two phases:
      • 1st phase: current limit is 4.5 grams/hour.
      • 2nd phase (by 2020): reduction to 2.5 grams/hour with cord wood and 2.0 grams/hour with crib wood.

    Principles of Draft and Flow

    • Ensures exhaust flue gases exit to the outside, protects the home from hot gases and sparks, and draws in combustion air.

    Natural Draft Dynamics

    • Natural draft moves air into the appliance and expels combustion byproducts due to the temperature difference between gases and outside air.

    Flow Definition

    • Flow refers to the volume of gases that traverse the venting system due to draft.

    House Stack Effect

    • Occurs when a heated house portion is taller than the vent termination, creating additional chimney effect due to leaks and upper-window openings.

    Mechanical Draft Utility

    • Mechanical draft systems can remedy venting issues but must be listed and installed per specific instructions.

    Measurement of Draft Gauges

    • Draft gauges are measured in Water Column Inches.

    Chimney Connector Pipe Function

    • The chimney connector pipe connects the appliance to the chimney and is critical for proper venting.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge with these flashcards covering essential concepts from the NFI Core Review Class. Learn about the stages of combustion, energy output of wood, and the role of catalytic converters in reducing ignition temperatures. Perfect for those preparing for certification or looking to enhance their expertise in fire science.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser