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When a round flue is used for the lining of a fireplace chimney the proper fireplace opening to flue size ratio should be
12:
When unlined the smoke chamber walls shall be what thickness
8"
When the opening of the firebox is 6 square feet the extension of the hearth should be
20 inches
T or F the inner surfaces of the smoke chamber shall not be inclined more than 45 degrees from vertical
True
A level 2 inspection inspection of accessible areas of attics basements and crawlspaces
True
The purpose of a heat reclaimer is to
Extract heat from the flue gases
What best describes the allowable free air space around a flue tile
1/4 inch to 4 inch
Crickets are recommended whenever the chimney is
30" wide
The maximum allowable slope of an offset in a verticle flue is
30 degrees
The area of the spark arrestor must not be less than three times the net free area of the chimney flue
True
What is the minimum thickness of a wythe
4 inches nominal
A type 3 ladder is rated for
200 lbs
what are the stages of wood burning
drying pyrolysis charcoaling
The volume of gases which actually pass through the system as a result of draft is
Flow
Rectangular flues with aspect ratios greater than 2 to 1 shall be sized at least ______ of the fireplace opening
1:
single wall connector clearance for an unlisted gas appliance with a draft hood is
a level ______ inspection is done with ladders and common hand tools
2
Draft is the force or pressure difference between the inside and the outside of the venting system
true
NFPA 211 recommends chimney flues should be inspected
Annually
Two major factors that affect draft are
temperature differential and chimney height
what are factors of combustion efficiency
time turbulence and temperature
rabies is not carried by
Birds
what species carries histoplasmosis
Birds
what animal is known for roundworm
raccoons
what is NOT a step of a sweep
where the trim of a mantel extends up to an 1 1/2 inch clearance to combustibles from the firebox opening should be at least
6 inches
there must be _______ inches of masonry between a wall thimble an combustible material
12
smoke pipe diameter 6 through 10 inches has a required gauge of
24 gauge
T or F - single wall chimneys on the exterior of a home can only be used for oil or gas
Flase
ONly allowable vent to be used in a stud cavity of a wall
BW Vent
A single wall connector used for oil and solid fuel appliances requires at least _____ inches of clearance to combustible material
18
T or F - A type L vent is used for low temp oil appliances and gas appliances
True
Unlisted appliances with legs providing 6 inches or more of ventilation under the appliance require what type of hearth
connector pipe of thimble should extend into the chimney how far
flush with the interior flue wall
how many screws for connector pipe
3
the formula for determining the cross sectional area of a square or rectangular flue is?
two major factors influence the mount of draft what are they
temperature difference the outside and flue gas temp and the height of the chimney
The height of the smoke chamber should be no taller than
Natural gas has how many BTU per cubic foot of gas
1000
Propane gas has how many BTU per cubic foot of gas
2500
creosote is a
carcinogenic
How do you reset a stack control on an oil fired appliance
PUll the lever out 1/4 of an inch than release slowly
Backpuffing is
smoke coming into the room in short sharp burst
The customer thinks there chimney was damaged in a recent hurricane you should recommend what
a level 2 inspection
To help establish draft in a cold chimney when trying to light the fire you could
hold a bruning newspaper wand up in the damper
T or F - video scanning the chimney is required in a level 1 inspection
false
a barometric damper does what
reduces draft
a way to increase draft would be to
raise the height of the chimney
a combustion chamber is
an area in the appliance where heat is produced
when the furnace blower is on the return side of the furnace it will?
Create positive pressure around the furnace exchanger
Horizontal sections of connector pipe should be installed with the seems on ______
residence time is
the amount of time smoke stays in the venting system
checking the fire stopping is part of a _______ inspection
level 3
checking that the wall pass through has adequate clearance is part of a _______ inspection
level 2
checking the basic appliance installation and connection is part of a ______ inspection
Level 1
Checking the size and suitability of flues for the connected appliances is part of a ________ inspection
Level 2
Checking the appliance and connector clearance is part of a _______
Level 1 inspection
Checking the expansion joint the flue tile and the wash is part of a ________ inspection
level 2
when the fireplace opening is greater than 6 square feet the hearth must extend ______ to the front and ________ to the sides
20 and 12
a 3.5 inch thick brick wall protection system, installed with a 1-inch air space will reduce clearance to combustibles material by
When used with an unlisted free standing stove the clearance between the combustible wall and the woodstove should be ______ when the wall is protected by a 3.5 brick wall with a 1 inch airspace
12 inches
information on draft hoods can by found in
NFPA 54 or NFGC (same document)
Steel fireplace units incorporating a firebox liner of not less than _____ thick steel and an air chamber shall be installed with masonary to provide a total thickness at the back and side of not less than _____ not less than _____ of which shall be solid masonry
1/4 inch - 8 inches - 4 inches
The minimum height for a chimney or vent above flue collat or draft hood is
3 feet
A chimney must be ______ taller than anything portion of any structure located within 10 feet of the chimney
24 inches
Interior residential chimneys shall be ______ where they extend through closets storage areas or habitable spaces
what is the formula to determine the area of a circle
Radius X Radius X pi
if a mantel projects more than 3 inches it should be
12 " above the fireplace opening
how much can a nominal dimension vary
no more than 1/2 inch
According to IRC where there is no firebrick lining in the firebox the thickness of back and side walls shall not be less than
10"the clearance to combustibles for a exterior masonry chimney is
1 inch
the clearance to combustibles for an interior masonry chimney is
2 inch
Are unlisted decorative shrouds allowed on zero clearance fireplaces
NO
3 and 1/2 inch thick masonry wall without ventilated air space allows you to reduce clearances by how much
33%
A form of draft that is created in the house because of the differential temp between the inside of the home is an example of what
Stack effect
Draft is measure in
Pi
Mobile and manufactured homes must meet what standard
Stringent NFPA 211
T or F - vents are used for vented solid fuel burning appliances only
False
A draft hood should be installed on a wood stove when
single wall connectors less than or equal to what diameter will be permitted to pass through a partition or wall.
T or F a connector is a UL listed pipe to connect a fuel burning appliance to a chimney or vent
False
Smoke density is
Amount of unburned hydrocarbons in the flue gas
proper clearance to combustibles, inspection of accessible attics and rooftop inspection would be considered what level of inspection
Level 2
T or F - The net free area of the spark arrestor must not be less than 3 times the net free area of the chimney flue it serves
True
when installing stove pipe on a wood stove which end of the smoke pipe goes down toward the appliance
Male
The ideal moisture content of wood should range between
15 and 20%
The two major principles at work in a chimney are?
Draft and flow
Minimum air space allowed between the flue lining and the interior masonry wall is
not less than 1/2 inch
True or false - the lintel provides a transition from the smoke chamber to the flue lining
False
