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A series of questions and answers related to the installation and safety of solid fuel appliances, such as wood stoves and fireplaces. It covers topics including required clearances, chimney construction, combustion efficiency, and regulatory standards. The content is presented in a question-and-answer format, making it useful for quick review and self-testing. It includes information on topics such as chimney connector clearances, hearth extensions, and combustion byproducts. The document also touches on epa regulations and best practices for efficient and safe operation of solid fuel appliances. It is designed to help professionals and homeowners understand and comply with safety standards.
Typology: Exams
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Solid fuel appliances with legs 6 inches or longer, floor protection must consist of____________________. - Correct Answer โ โ Closely spaced masonry units of brick, concrete, or stone that provide a thickness of not less than 2", and covered with (24) gauge or thicker sheet metal.
NFPA 211 requires that at least ________ inch of open, ventilated airspace be provided between a single-wall connector that passes through a masonry wall used as a wall shield and the masonry. - Correct Answer โ โ 1/
Name the 2 appliance design improvements that have increased efficiency and reductions in emissions. - Correct Answer โ โ 1. Catalytic combustor technology
Gas log sets that use a FBF for exhaust combustion by-products must be listed to? - Correct Answer โ โ ANSI Z21.60 Decorative Gas Appliance's for installation in solid-fuel appliances.
True or False Thermostats are prohibited for use with vented gas logs.
True or False; A fire screen must be in place during use of a vented gas log set? - Correct Answer โ โ True
According to ANSI Z21.50 vented gas logs must be equipped with __________ - Correct Answer โ โ an automatic gas ignition shutoff system.
A long run for a chimney connector is generally defined as - Correct Answer โ โ more than 6-8 ft
If off set elbows must be used on a connector it is recommended to have the elbows__________________________ - Correct Answer โ
โ As close to the chimney as possible.
The national regulations did not apply to appliances with: - Correct Answer โ โ - burn rates grater 5kg/hr (11lbs of wood)
-coal
-open wood burning
Tests showed that these regulations from the 80's showed that - Correct Answer โ โ Emissions from certified appliances were 6kg/hr a reduction of 85%
May 2015 revised EPA regulations step 1 - Correct Answer โ โ - wood, pellet stoves = 4.5gram per hour limit
May 15 2020 regulations for wood and pellet stoves - Correct Answer โ โ - 2 grams per/hr crib wood
Stages of solid fuel combustion - Correct Answer โ โ 1. Moisture Evaporation > 212F
How much water is produced for each pound of wood burned. - Correct Answer โ โ 1/2 lb
At 100% combustion efficiency what byproducts would be produced - Correct Answer โ โ - Water vapor
Chimney connector reduced clearances with wall and ceiling protection:
24 gauge sheet metal over 1" glass fiber or mineral batts reinforced with wire, or equivalent on rear face, with at least 1" ventilated airspace
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - Correct Answer โ โ Max Wall & Ceiling = 66% / 50% Min allowed = 6"/9"
Chimney connector reduced clearances with wall and ceiling protection:
3 1/2 " thick masonry wall with ventilated airspace:
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - Correct Answer โ โ Max Wall & Ceiling = 66% / โ Min allowed = 6"/ โ
Chimney connector reduced clearances with wall and ceiling protection:
1/2" thick noncombustible insulation board over 1" glass fiber or mineral wool batts without ventilated airspace.
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - Correct Answer โ โ Max Wall & Ceiling = 50% / 33%. Min allowed = 9" / 12"
Chimney connector reduced clearances with wall and ceiling protection:
24 gauge sheet metal with at least 1" of ventilated airspace
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - Correct Answer โ โ Max Wall & Ceiling = 66% / 50% Min allowed = 6"/ 9"
3 1/2" masonry wall no ventilation, as wall protector / as ceiling protector - Correct Answer โ โ 33 1/3% / โโโโ
Maximum allowable clearance reduction from appliances (listed & unlisted)
3 1/2" masonry wall spaced out 1" as wall protector / as ceiling protector - Correct Answer โ โ 66 2/3% / โโโโ
Maximum allowable clearance reduction from appliances (listed & unlisted)
1/2" noncombustible insulation board over 1" glass fiber or mineral wool batts no ventilation, as wall protector , as ceiling protector - Correct Answer โ โ 50% / 33 1/3%
Maximum allowable clearance reduction from appliances (listed & unlisted)
Minimum 24 gauge sheet metal spaced out 1", as wall protector , as ceiling protector - Correct Answer โ โ 66 2/3% / 50%
Maximum allowable clearance reduction from appliances (listed & unlisted)
1/2" noncombustible insulation board over spaced out 1", as wall protector , as ceiling protector - Correct Answer โ โ 66 2/3% / 50%
Maximum allowed clearance reduction from appliance. ( Listed prefabricated systems) - Correct Answer โ โ Per manufactures instructions.
After reduction of listed clearances from appliances, clearances shall not be less than - Correct Answer โ โ 12"
UL 1618 Wall protectors, Floor protectors and hearth extinctions does not allow wall protectors to reduce listed appliance clearances to less than ___________" - Correct Answer โ โ 12
NFPA 211 requires a minimum of __________ inches clearance to combustibles for unlisted woodstoves - Correct Answer โ โ 36
the net free area of the outlet of the flue that it serves. - Correct Answer โ โ 4
A wythe or partition should be constructed of at least ____________" (nominal) thick solid masonry. - Correct Answer โ โ 4
An interior chimney requires a minimum ____________ inch clearance to combustible material - Correct Answer โ โ 2
Concerning interior masonry chimneys: Firestopping with a noncombustible sheet material no greater than __________inch thick, or galvanized steel not less than ______________gague must be installed at every floor and ceiling through which the chimney passes.
Interior chimney - Correct Answer โ โ One that has any portion of the chimney within the exterior wall of the building.
Exterior chimney - Correct Answer โ โ Is defined as one that has the entire chimney completely outside the exterior wall of the chimney.
An exterior chimney requires a minimum ________________ inch clearance to combustible material. - Correct Answer โ โ 1
Thimble - Correct Answer โ โ Is a lining for the opening from the room into the chimney, into which the chimney connector is inserted. Also called a breaching..
Thimbles should be constructed by flue liners not less than - ______________inch thick, galvanized sheet metal of_______________ gauge minimum thickness, or noncombustible sheet material not more than __________ inch thick - Correct Answer โ โ 5/8, 24, 1/
UL 1777 liners suitable for use with closed chamber solid fuel hearth appliances are tested to sustained temperatures of _____________
What is the primary function of a Catalyst - Correct Answer โ โ To convert unburned hydrocarbons and CO to compounds that ignite at lower temperatures.
Conditions that reduce the effective surface area of a catalyst are? - Correct Answer โ โ โข plugging
**- masking
Masking - Correct Answer โ โ When the combustor becomes coated with carbon from low oxygen use and/or fly ash.
Peeling - Correct Answer โ โ Extreme temperatures (over 1800F) or flame impingement can cause the cells to peel away from the substrate of a catalytic combustor.
Substrate deterioration. - Correct Answer โ โ Damage to a combustor from...
**- thermal shock
Name the 2 types of firebrick in wood stoves and their characteristics.
General guidelines for Minimum and Maximum draft for a wood stove
Max = + .10 -.
Minimum clearance for unprotected single wall connector is? - Correct Answer โ โ 18"
The Small crimped end of the chimney connector should be pointed down because? - Correct Answer โ โ This method contains solid and liquid materials inside the connector.
According to NFPA 211, a masonry wall constructed directly against a combustible wall can reduce appliance clearances by no more than? - Correct Answer โ โ 33%
Define an interior chimney? - Correct Answer โ โ A chimney which has "any portion of the chimney within the the exterior wall of the building".
An exterior chimney must be constructed - Correct Answer โ โ Completely outside the exterior wall.
Interior chimneys have a _______" C2C and exterior chimney have a ________" C2C - Correct Answer โ โ 2", 1"
Minimum C2C for an unlisted appliance - Correct Answer โ โ 36"
k-value indicates - Correct Answer โ โ The amount of heat (in BTUs) that will flow in one hour through one sq foot of a uniform material one-inch thick for each degree (F) of temperature difference from one side to the other.
R-value - Correct Answer โ โ Is a measure of a materials resistance to heat transfer.
Formula for converting k to R - Correct Answer โ โ R = (1/k) x inches of thickness
Formula for determining k-value - Correct Answer โ โ (BTU) (inch)
โโโโโโโ
(foot)squared (hour) (F)
What conditions promote creosote buildup; (incomplete combustion)