Chimneys, Stoves, and Fireplaces Flashcards
Footings for masonry chimneys must be made of concrete or solid masonry and be at least this thick?
12-inches.
How far should the footing for a masonry chimney extend beyond the face of the fireplace or foundation wall on all sides?
At least 6- inches
Footings for masonry fireplaces must extend below what line?
The frost line.
How far should house framing components be from the chimney wall?
At least 2- inches
What height rule should masonry chimneys follow?
The 3, 2, 10
Where should inlets on a masonry chimney enter?
From the side.
If single-wall metal pipe is used as a vent connector, what is the minimum clearance to combustibles?
18 inches
Which chimneys must be lined?
All masonry
Unlined chimneys are not safe. Any chimney without a flue lining should be reported as a what?
A Material defect
What’s the minimum standard thickness for a flue lining?
5/8-inch thick.
Clay flue lining should protrude a minimum of how far above the top brick course or masonry cap?
4 inches.
Wood-burning, gas, or oil applications need a flue vent with what type of liner?
Stainless steel
What is an inexpensive alternative vent material only for certain medium-efficiency gas heating systems?
Aluminum
Which chimney lining is smooth, seamless stack, and suitable for all fuels?
A cast-in-place
The height requirements for chimney terminations (per the 3-2-10 Rule) do not apply to these?
Fuel vents.
A greater vent height above the roof is needed as the roof pitch approaches being a what?
A vertical surface
A venting system is not permitted to extend into or pass through these HVAC components?
Air ducts or furnace plenums
How many heating system should a single flue be used for?
One
Gas vents that are greater than 12 inches in diameter or located less than 8 feet from a vertical structure should follow what rule?
2-2-10
Efflorescence on a chimney’s brickwork below the roof line may indicate that there is a leak where ?
At the roof flashing
If combustibles project out an 1-1/2 or more from the fireplace, how far above the opening should they be?
12-inches
A fireplace with a 6 square foot or less opening requires a minimum hearth of ?
16 inches in front and 8 inches on each side.
Zero-clearance fireplaces do require a clearance from combustibles at the _____ of the fireplace?
Top.
Type B vents should only be used with appliances that are equipped with a draft hood and burn either one of these two types of fuel ?
Natural gas or LP
Type B vents can not be used on appliance that produces flue gases that exceed what temperature?
480° F
Which type of vent must be equipped with its own special chimney caps?
Type B
Which vent pipe is commonly used for water heaters, furnaces, boilers, wall heaters and space heaters that burn natural gas or LP?
Type B
Type B is a double-wall vent made of what?
Galvanized metal and aluminum.
What is the clearance from combustibles for Type B pipe ?
1 inch
The vent type should be clearly printed on where?
The vent pipe itself.
Which type of vent pipe should never be used with wood-burners, incinerators, oil-fired or coal-fired appliances, or any appliances that burn anything other than liquid petroleum or natural gas.
Type B
Type L vent pipe has an inner wall made of what?
Stainless Steel
Type L vent gasses should not exceed what?
570 degrees.
What is Type L’s minimum distance from combustibles?
3-inches
Type L is used for which type of fuels?
Oil and natural gas.
Type L should not be used to vent which appliances?
Coal or wood-fired.
Type L has a min-max height of what?
6 and 30 feet.
What is the height rule for Type L vent?
2-2-10
All masonry chimneys should have one of these made of concrete, metal or stone to help protect it from rain and snow?
A cap
The chimney cap should have this to help shed rain?
Drip edge
There should be a caulked bond break around the what?
Flue liner
What’s the minimum over hang for a chimney crown/cap on all sides?
2 inch
How far above the chimney crown should a flue liner project?
4 inch minimum
What size screen openings should a spark arrestor have?
3/8 to 1/2 inch
Most masonry chimneys have an inadequate cap because they were constructed using what?
Common mortar mix
What’s the minimum concrete thickness for a fireplace hearth?
4 inches
What’s the bearing length of each end of a lintel?
4-inches
Most fireplaces are sized large enough to receive a piece of firewood cut how long?
2-foot-long
How deep should the firebox of a concrete/masonry fireplace be?
20 inches
Firebrick or other approved lining material inside the firebox should be how thick?
At least 2 inches
The back and side walls behind the lining should be made of what material?
Solid masonry
A firebox’s back/sidewalls with a firebrick liner should have a total thickness of what?
8-inches
The width of the mortar joints of the firebrick lining should not exceed what width?
1/4-inch
If there’s no firebrick lining inside the firebox, then the back and side walls should be solid brick and how thick?
10 inches
The angle of the back wall is called what?
Splay
Splay slope is usually how much per foot?
5-inches per
Refractory mortar is specified but ______ used.
Seldom
What controls the efficiency of a fireplace?
The throat
The damper must be operable from the room containing what?
The fireplace
Manually operated dampers can be installed only in connectors or chimneys serving fireplaces and stoves that burn what type of fuel?
Solid-fuel
The top of the flue clean-out opening needs to be a minimum of how far from the lowest inlet?
6 inches
What’s the minimum height of a flue clean-out opening?
6 inches
Exterior air intake must not be located in what two areas?
The garage or basement of the house.
Factory-Built Chimneys
T/F: A chimney cap must be installed on top of the flue pipe.
True
Factory-Built Chimneys:
If a factory-built chimney is used with a solid-fuel burner or an appliance with corrosive gases, the inside flue pipe should be either one of these?
Stainless steel or a porcelain-coated surface.
Factory-Built Fireplace:
The refractory panel walls require replacement if this can be inserted into the crack?
A nickel
Factory-Built Fireplace:
The panels require replacement if the original surface has abraded by this much?
1/4-inch
Factory-Built Fireplace:
Who should replace the refractory panels?
A qualified professional
Wood-Burning Stoves:
In which type of stove does the smoky exhaust pass through a coated, ceramic honeycomb that ignites particulates and smoke gases.
A catalytic stove.
Wood-Burning Stoves:
What should never be used because it burns significantly hotter than wood and would pose a fire hazard?
Coal
What is the minimum distance above a fireplace opening for any combustible that projects out an 1 1/2 or less?
6-inches
What is the minimum distance above a fireplace opening for any combustible that will project out more than an 1 1/2?
12-inches
Combustible materials should be kept away from the fireplace opening a minimum of how far?
3 feet
Hearths not made of concrete or masonry and have a thickness of less than 4 inches should be written up as?
A defect
Hearths should have a minimum thickness of?
2 inches
Single-Wall Metal Chimney:
Heat shields/wall protectors should have an air gap of at least?
1-inch
Single-Wall Metal Chimney:
Should not be used in what type of dwellings?
One- and two-family
Single-Wall Metal Chimney:
How far away from wood framed walls or combustible materials should they be kept?
18 inches
Single-Wall Metal Chimney:
Under 18 inch diameter should be kept how far away from non-combustible walls?
At least 2 inches
Single-Wall Metal Chimney:
18 inches and up in diameter should be kept how far away from non-combustible walls?
At least 4 inches
Flues and connectors should not be this material?
Galvanized metal.
Metal flues should be free of what?
Rust and corrosion
Every masonry chimney should be what?
Lined
A solid fuel-burning appliance vent should have a rise to the chimney of what ?
1/4-inch per foot
Masonry Chimney:
Where should a smaller vent pipe be connected to the chimney in relation to a larger one?
Above it
If two or more vent connector enter one chimney flue or vent, how must the pipe penetrations be made?
At different levels
If two or more vent connector pipes do enter a chimney flue or vent at the same level, the connectors must be made at what angle?
45 degree or less.
How far should combustible materials be kept from a fireplace’s cleanout door?
18 inches
When inspecting a cleanout door they should be unobstructed and do this?
Close tightly
The cleanout opening for a masonry chimney must be located how close to the base of the flue?
Within 6 inches
An interior flue clean-out should be how far above the lowest accessible floor level?
16 inches.
A smoke/CO monitor should be located where?
In the same room as the fireplace.
How far above the fireplace opening should a throat or damper be located?
8 inches
A damper should be checked for proper operations and what?
Rust or corrosion.
Hearths that are not made of concrete, masonry and less than 4 inches are considered what?
Defects
A chimney that passes through a combustible roofs requires what?
A thimble
Should chimney crowns be flat or sloped?
Sloped
The space around and between chimney liners should not be used as what?
A vent
A chimney may contain more than one flue. If it does, the flues must be separated by a solid masonry partitions of what thickness?
4 inch
It is a common mistake to apply chimney termination _________ requirements to fuel vents.
height
The inspector should inspect the bases of chimney flues for distances that are not between ____ and 12 inches below the bottom edges of their cleanout openings.
6
Factory-built or masonry fireplaces must be provided with an exterior air supply to assure proper fuel combustion, unless the room is _______
mechanically ventilated
The cross-sectional area of a chimney flue is based on the _______ of the fireplace opening.
area
Mortar between the bricks or stones that crumbles when poked with a screwdriver is considered a _____ condition.
defective
The inspector should inspect for chimneys that terminate less than __________ feet above the highest point where they pass through the roof surface.
3
__________ stoves have three characteristics that assist complete, clean combustion: pre-heated combustion air introduced from above the fuel; firebox insulation; and a large baffle.
Non-catalytic
_________ built chimneys are NOT required to be of masonry construction.
Factory
_____ from wood stoves can cause a variety of health ailments, from asthma to cancer.
Smoke
You may find a properly installed _______ from a gas-fired furnace and a gas-fired water tank
connected into one flue.
Vent
The top of a factory-built fireplace’s chimney has a _____ to divert rainwater from the chimney pipe to the chimney flashing.
storm collar
The inspector should inspect the bases of chimney flues for distances that are not between ____ and 12 inches below the bottom edges of their cleanout openings.
6
Factory-built or masonry fireplaces must be provided with an exterior air supply to assure proper fuel combustion, unless the room is what?
mechanically ventilated
How often should a chimney or wood stove be inspected and cleaned by a certified chimney specialist?
every year
A factory-built fireplace can have a clearance of what to combustibles?
zero
Disposing of ashes from a wood stove using a central vacuum system is considered what?
unsafe
If a ventless fireplace is oversized for the square footage of the area to be heated, it is still considered?
Safe
The openings through which the chimneys of factory-built fireplaces pass should be blocked with support boxes and?
fire-stop spacers
What can create pressure that is greater than the structural strength of concrete, which can be between 2,000 to 3,000 psi?
osmosis
What is the recommend rise of the vent connector coming directly off the appliance?
A minimum of 1 foot
B-vent chimney sections stacked vertically should be secured to the wall how often?
Every 6-feet.
When vent connectors of several gas-fired appliances go into a common vent, the vent connector from each individual appliance should be arranged to have as much _______ as possible before starting the lateral run to the common vent?
Vertical rise
To prevent accidental damage to the system, as well as burns, any portion of the vent which passes through an occupied area must be what?
enclosed
Type B-Vent is intended for use with this type of draft applications?
Neutral or negative
In a gas vent these are note permitted?
Dampers / restriction
These must be provided where the vent passes through both the floor and the ceiling?
Firestops
The appliances to be vented should be placed as close as possible to what point?
Where the vent is to run vertically up through the building.
What class fires involves combustible metals, such as sodium, potassium, titanium and magnesium?
Class D
Is it generally safe to burn pallets in a fireplace?
Yes
Flues and connectors should not be this type of metal?
Galvanized.
Masonry chimneys shall not be corbeled from a wall or foundation more than _______ of the chimney wall thickness.
One-half
What is Type B vent’S clearance above the ground, veranda, porch, deck, or balcony?
12 inches minimum
Type L flue gasses should not exceed what temperature?
570º F.
What is Type B vent’s clearance to a window (operable or fixed closed) or door?
12 inches minimum
Which connectors can not pass through attic, unheated spaces, partitions, or in concealed areas?
Single-wall
What is Type B vent’s minimum clearance to a ventilated soffit locate?
18 inches
What is Type B vent’s minimum clearance to a mechanical air supply inlet?
6 feet
What is Type B vent’s minimum clearance to an unventilated soffit?
12 inches
A solid-fuel-burning fireplace, stove, or heating system ______ connect to a chimney venting another fireplace, stove, or heating system.
Must not
The chimney could lean where it projects above the roof due to deteriorated mortar joints caused by this type of swaying?
Wind-induced swaying
