Lennox C310 User Manual
INSTALLATION AND OPERATION MANUAL
US
Portland
EPA Certied
Wood-Burning
Fireplace Insert
Save These Instructions
For Future Reference
P/N 775,213M, Rev. B, 02/2010
A French manual is available upon request. Order P/N 775,213CF.
Report No. 050-S-10b-4
Wood Fireplace Insert
Model Canyon™ C310
Ce manuel d’installation est disponible en francais, simplement en faire la demande. Numéro de la
pièce 775,213CF.
These appliances must be properly installed and operated in order to prevent the
possibility of a house re. Please read this entire installation and operation
manual before installing and using your wood stove. Failure to follow
these instructions could result in property damage, bodily injury or
even death. Contact your local building or re ofcials to obtain
a permit and information on any installation requirements
and inspection requirements in your area.
WARNINGS
• Hot! Do not touch! The glass and surfaces of this appliance will
be hot during operation and will retain heat for a while after
shutting off the appliance. Severe burns may result.
• Carefully supervise children in the same room as appliance.
CONGRATULATIONS!
When you purchased your new wood-burning fireplace insert,
you joined the ranks of thousands of individuals whose answer
to their home heating needs reflects their concern for aesthetics, efficiency and our environment. We extend our continued
support to help you achieve the maximum benefit and enjoyment
available from your new wood-burning fireplace insert.
Thank you for selecting a Lennox Hearth Products wood-burning
fireplace insert as the answer to your home heating needs.
TABLE OF CONTENTS
Using This Manual ......................................................................... 2
Important Safety Information .........................................................3
Testing Information ........................................................................ 4
Draft Requirements ........................................................................4
Selecting the Proper Venting System .............................................4
Negative Pressure Warning ........................................................... 5
Creosote ......................................................................................... 5
Ash Disposal .................................................................................. 5
Fuel ...........................................................................................
Burn-In Period ...............................................................................5
Paint Curing ................................................................................... 5
Brick Installation ............................................................................ 6
Required Clearances ...................................................................... 7
Hearth Protection ........................................................................... 8
Chimney Requirements .................................................................. 9
Installation Procedures-Masonry Chimney ....................................9
5
Positive Flue Connection .............................................................. 10
Insert Pre-Installation Preparation ............................................... 11
Chimney Liner Installation ........................................................... 11
Installing the Insert ...................................................................... 11
Post Installation Checks ............................................................... 11
Operating Hints ............................................................................ 12
Starting and Maintaining a Fire ....................................................12
Blower Operation (optional kit) .................................................... 13
Operating Techniques and Hints................................................... 14
Getting the Most Out of Your Stove ............................................. 14
Maximizing Your Stove’s Overall Efficiency .................................. 14
Achieving Clean, Long Burns ....................................................... 14
Maintenance ................................................................................. 15
Clean Glass .................................................................................. 15
Troubleshooting ...........................................................................16
Do’s and Don’ts ............................................................................17
Replacement Parts List ...........................................................18-20
Accessories .................................................................................. 21
Safety / Listing Labels .................................................................. 22
Product Reference Information .................................................... 24
USING THIS MANUAL
Please read and carefully follow all of the instructions found in this
manual. Please pay special attention to the safety instructions provided
in this manual.
PRODUCT IS SUBJECT TO CHANGE WITHOUT NOTICE
2
IMPORTANT SAFETY AND WARNIING
INFORMATION
READ THIS MANUAL IN ITS ENTIRETY AND UNDERSTAND THESE RULES TO FOLLOW FOR SAFETY.
1. When this room heater is not properly installed, a house fire may
result. To reduce the risk of fire, follow the installation instructions. Contact local building or fire officials about restrictions
and installation inspection requirements in your area.
2. Wear gloves during installation to avoid injury from sharp
edges on the fireplace insert and/or its parts.
3. This unit is designed and engineered to burn only dry, wellseasoned wood. Burning wet wood will greatly reduce your
fireplace inserts efficiency, produce excessive amounts of
smoke and can cause dangerous chimney fires due to creosote
build-up.
4. Before opening the door, the draft control must be fully open
to avoid possible combustion flash (ignition of hot volatile
gases as the door is opened).
5. Never use gasoline, gasoline-type lantern fuel, kerosene,
charcoal lighter fluid, or similar liquids to start or ’freshenup’
a fire in this heater. Keep all such liquids well away from the
heater while it is in use.
6. While burning, fuel utilizes oxygen from the air in the room.
Be sure to allow an adequate amount of fresh air into the
room where the fireplace insert is burning.
7. The outside surface of the fireplace insert will be hot while
burning properly and can set items like clothing and curtains
on fire. Keep furnishings and other combustible materials away
from the fireplace insert. Using the heat from the fireplace
insert to dry wet clothing can be hazardous if clothes are
placed too near the surface of the fireplace insert.
8. Hot while in operation. Keep children, clothing furnishings and
combustible material a considerable distance away. Contact
may cause skin burns. Do not allow children to play near the
fireplace insert without close supervision. Do not touch the
fireplace insert while it is burning. Use extreme caution while
the unit is in use. Surface temperatures become dangerously
hot and can cause serious burns.
9. Do not allow anyone to operate the fireplace insert who is not
familiar with the operating instructions.
10. Attempts to achieve heat output rates that exceed fireplace
insert design specifications can result in permanent damage to the fireplace insert. Never leave your fireplace insert
unattended on high burn rates. This may cause overfiring.
Overfiring the fireplace insert may cause a house fire. If the
fireplace insert glows, you are overfiring.
11. Keep a water hose or hand-operated fire extinguisher close
for safety.
12. Smoke Detectors - Since there are always several potential
sources of fire in any home, we recommend installing smoke
detectors. If possible, install the smoke detector in a hallway
adjacent to the room (to reduce the possibility of occasional
false activation from the heat produced by the insert). If your
local code requires a smoke detector be installed within the
same room, you must follow the requirements of your local
code. Check with your local building department for requirements in your area.
13. Inspect your chimney at least once a month during the burn
ing season to check for soot and creosote accumulations.
Any accumulations over 1/4” thick should be removed by a
professional chimney sweep. Do not attempt to burn out heavy
creosote accumulations with a hot fire. If large accumulations
are occurring, review your burning procedures.
14. If a creosote fire should develop, the fire department should
be called immediately and then attempts should be made to
control the fire until assistance arrives. If a “runaway” fire
should develop causing over-heating of the fireplace insert,
the door and draft regulators should be closed immediately.
The fire should die down once deprived of oxygen. After a
severe chimney fire, the complete chimney system should
be checked before further use.
15. Do Not Use Grate Or Elevate Fire - Build Wood Fire Directly
On Hearth (firebrick). Do not use andirons or other methods
of supporting the fuel.
16. Please read this entire manual before you install and use your
new room heater. Failure to follow instructions may result in
property damage, bodily injury, or even death.
17. Check all local building and safety codes before installation.
The installation instructions and appropriate code requirements must be followed exactly and without compromise.
In the absence of local codes the following standards and
codes must be followed.
18. In the U.S.A, install in accordance with the National Fire
Protection Association’s Code, NFPA 211, Standards for
Chimneys, Fireplaces, Vents and Solid-Fuel-Burning Appliances, or similar regulations, may apply to the installation of
a Solid-Fuel-Burning appliance in your area. In Canada, the
guideline is established by the CSA Standard, CAN/CSA-B365M93, Installation Code for Solid-Fuel-Burning Appliances and
Equipment.
19. Do not connect to any air distribution duct or system.
20. WARNING: BURNING IMPROPER FUEL (I.E. CHARCOAL)
CAN RESULT IN CARBON MONOXIDE POISONING, WHICH
MAY LEAD TO DEATH!
21. Carbon Monoxide Poisoning – early signs of carbon monox-
ide poisoning resemble the flu with headaches, dizziness, or
nausea. If you have these signs, get fresh air at once! Have
the heater inspected by a qualified service technician. Some
people are more affected by carbon monoxide than others.
These include pregnant women, people with heart or lung
disease or anemia, those under the influence of alcohol, and
those at high altitudes.
22. Failure to use manufacturer provided parts, variations in
techniques and construction materials or practices other than
those described in this manual may create a fire hazard and
void the limited warranty.
23. Do not make any make-shift compromises during installation.
Any modification or alteration may result in damage to the
appliance or dwelling and will void the warranty, certification
and listings of this unit.
24. These appliances are designed as supplemental heaters.
Therefore, it is advisable to have an alternate heat source
when installed in a dwelling.
25. Do Not Overfire – If Heater or Chimney Connector Glows,
You Are Overfiring.
26. DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING
ANOTHER APPLIANCE.
-
3
TESTING INFORMATION
Less than
10' (3 m)
10'
(3 m)
3' (914 mm)
Min.
2’ (610 mm) Min.
(914 mm)
Min.
3'
This manual describes the installation and operation of the Canyon™ C310
non-catalytic wood heaters. These heaters meet the U.S. Environmental
Protection Agency’s emissions limits for wood heaters sold on or after
July 1, 1990. This heater has been developed, tested and constructed
in accordance with the requirements of UL 1482, ULC S628 and HUD
standards and is listed by OMNI Test Laboratories, Portland, OR. It has
been approved for residential and alcove installations.
DRAFT REQUIREMENTS
read greater than .04’ W.C. (inches water column) and less than .08”
W.C. As per NFPA-211 standard (see paragraph below), the installer
must take into account all variables within the installation and install the
appliance in such a manner that satisfies the draft requirements of the
appliance. See Chimney Guidelines below to assist you in selecting the
proper venting system for your installation.
American National Standards Institute ANSI/NFPA 211, Standard for
Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances
- See Draft Section: A chimney or vent shall be so designed and con-
structed to develop a flow sufficient to completely remove all flue and
vent gases to the outside atmosphere. The venting system shall satisfy
the draft requirements of the connected appliance in accordance with the
manufacturer’s instructions.
Your wood fireplace insert is dependent upon a properly functioning
chimney for optimum performance. It is a high efficiency appliance that
loses much less heat up the chimney than older appliances and fireplaces.
For this reason it is important to match the fireplace insert to the chimney.
The chimney has two functions:
1. It draws combustion air into the appliance (without air, no fuel will
burn) and
2. It exhausts combustion by-products. Your new Country™ Collection
fireplace insert is what is known as a “natural draft” appliance.
The appliance depends solely on the natural draft of the chimney system
to draw combustion air into the unit. Draft is the force that moves air from
the appliance up into the chimney. The amount of draft in your chimney
depends on the length of the chimney, local geography, nearby obstructions
and other factors. Too much draft may cause excessive temperatures in the
appliance (overfiring). Slow or inadequate draft equals poor combustion
and possible smoking problems. The following are some conditions that
may contribute to poor chimney draft:
1. A chimney too large for your appliance.
2. A chimney with not enough height to produce adequate draft.
3. A chimney with excessive height (this may allow exhaust to cool too
much before exiting, which will stall the rate the exhaust exits).
4. Offsets in the venting system are too restrictive (see Chimney Guide-
lines).
Inadequate draft will cause the appliance to leak smoke into the room
through the fireplace insert and the chimney connector joints.
Excessive draft may cause an uncontrollable burn or a glowing red fireplace insert or chimney part.
Chimney Guidelines:
• This appliance requires approximately 12 feet minimum of “effective
draw” provided by the venting system. As a rule of thumb, every 90
degree total direction change in the venting will result in a loss of
approximately 5 feet of “effective draw.” Example: If two 45 degree
offsets are used, subtract 5 feet from the actual vertical vent height
to determine your “effective draw.” In this case if you had 14 feet of
vertical vent, the effective draw would only be approximately 9 feet
(14 ft. - 5 ft. = 9 ft.), therefore it may be necessary to add additional
height to the venting system.
• If the venting system is all vertical and the total vent length above the
flue outlet exceeds 14 feet, it is recommended that the 8” to 6” pipe
reducer is used (cat. no. 71134) and a 6” venting system be installed.
At higher elevations, this may not be necessary.
• In well insulated and weather tight homes, it may be difficult to establish
a good draft up your chimney. The poor draft is caused by a shortage
of air in the house (see Negative Pressure Warning on Page 5).
Chimney Height Requirements
The chimney must extend 3’ (.92m) above the level of roof penetration
and a minimum of 2’ (.61m) higher than any roof surface within 10’
(3m) (see below). Check with your local building officials for additional
requirements for your area.
Overfiring Damage - If the heater or chimney connector glows, you are
overfiring. Other symptoms may include: Cracking, warping or burning
out of components, plated doors may turn color, stove glass may develop
a haze, which will not come off with cleaning.
Overfiring of a fireplace insert is a condition where excessive temperatures
are reached, beyond the design capabilities of the appliance. The damage that occurs from overfiring is not covered under the manufacturer’s
limited warranty.
Also see Troubleshooting on Page 16.
SELECTING THE PROPER VENTING SYSTEM
The appliance is merely one component of a larger system. The other
equally important component is the venting system. This is necessary for
achieving the required flow of combustion air to the fire chamber and for
safely removing unwanted combustion by-products from the appliance.
If the venting system’s design does not promote these ends, the system
may not function properly. Poorly functioning venting systems may create
performance problems as well as be a safety hazard. A draft test should
4
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 1 - Chimney Height Requirements
To pass inspection in nearly any jurisdiction, the chimney must meet both
safety and exhaust flow requirements. The (3’ by) 2’ by 10’ rule applies
to both masonry and factory-built chimneys.
* Ref. USA - National Standard, NFPA 211-latest edition and Canada
National Standard CSA B365-01-latest edition. Vents installed with a
listed cap shall terminate in accordance with the terms of the cap’s
listings.
NEGATIVE PRESSURE WARNING
This appliance is not designed to be operated in a negative pressure.
In very airtight homes with large kitchen exhaust fans, furnace cold air
returns, fresh air exchange systems and any other air system in close
proximity to the heating appliance may create a negative pressure in the
same room as the heating appliance. This can create dangerous back
drafting of the stove and chimney joints, drawing combustion by-products
into the home. Be sure your home has adequate makeup air to eliminate
negative pressures caused by the above-mentioned sources. Outside air
connected to the appliance probably will not resolve such a problem as
the stove or fireplace insert is not the source of negative pressure. Lennox
Hearth Products accepts no liability for damages resulting from negative
pressures described above.
Dry, seasoned wood is that which has been cut, split and allowed to dry
under a covered area where air is free to flow and circulate under and
around the wood (not under a tarp or plastic). Make sure wood is not
stacked directly on the ground, it may absorb moisture from the ground.
It should be allowed to dry in these conditions for a minimum of six
months, preferably one year or more. IT MUST BE UNDERSTOOD THAT
WOOD CANNOT BE LEFT IN ANY KIND OF WET OR DAMP AREA OR IT
WILL NEVER BECOME COMPLETELY SEASONED. Your fireplace insert
will not operate at the level that it is meant to unless you use seasoned,
dry wood. Do not burn driftwood or wood that has been in salt water,
doing so will void your warranty. Do not burn treated wood, coal, garbage,
cardboard, solvents, or colored paper. Burning treated wood, garbage,
solvents, or colored paper may result in the release of toxic fumes. This
type of burning will also void your warranty.
Ventilation Requirements - Provide adequate air for combustion. The
fresh air requirements of this appliance must be met within the space
where it will be installed. Ventilation is essential when using a Solid-FuelBurning heater. In well insulated and weather tight homes, it may be
difficult to establish a good draft up the chimney (caused by a shortage
of air in the home). The lack of air is caused by many common household
appliances which exhaust air from the home (such as a furnace, heat
pump, air conditioner, clothes dryer, exhaust fans, fireplaces, and other
fuel burning appliances). Also, the combustion process of this heater
uses oxygen from inside the dwelling. If the available fresh air delivery
in the dwelling is insufficient to support the demands of these appliances,
problems can result (i.e. excessive negative pressure can develop in the
dwelling which will affect the rate at which this appliance can draft thus
resulting in performance problems. To correct this problem it may help to
open a window (preferably on the windward side of the house) or install
an optional outside air kit.
CREOSOTE, FORMATION AND NEED FOR REMOVAL
When wood is burned slowly, it produces tar and other organic vapors,
which combine with expelled moisture to form creosote. The creosote
vapors condense in the relatively cool chimney flue of a slow-burning
fire. As a result, creosote residue accumulates on the flue lining. When
ignited, this creosote makes an extremely hot fire. The chimney and
chimney connector should be inspected at least once monthly during
the heating season to determine if a creosote buildup has occurred. If
creosote has accumulated, it should be removed to reduce the risk of a
chimney fire.
PAINT CURING
If your fireplace insert has a Gold or Nickel-Plated Door, be sure to clean
it with household type glass cleaner and a very soft cloth to remove
any fingerprints and residues prior to the first fire and before any fire
if the gold has been handled or soiled. Do not close the door tightly
during the “Burn-In Period.” Also, open the door frequently (every
5-10 minutes) to keep the gasket from adhering to the curing paint.
Ventilate the house well during these first firings as the paint gives off
carbon dioxide and unpleasant odors. It is recommended that persons
sensitive to an imbalance in the indoor air quality avoid the fireplace
insert during the curing process.
Your new Canyon™ C310 is painted with a high temperature paint that
cures during the first few firings. We recommend that you put your stove
through a regimen of three burns. The first two should last for 20 minutes
each at 250 degrees (the stove should be allowed to cool completely
between each burn). The third should be a burn of at least 450 degrees
F. for 45-60 minutes. The paint will become soft, gummy and emit nontoxic smoke during these burns. After the stove cools down for the third
time, the paint will harden. DO NOT BUILD A LARGE ROARING FIRE
UNTIL THIS CURING EFFECT IS COMPLETE OR YOU MAY DAMAGE
THE FINISH OF YOUR STOVE. Spray can touch-ups should be done only
with a high temperature stove paint (cat. no. 70K99), available from all
Lennox Hearth Products dealers.
BURN-IN PERIOD
ASH DISPOSAL
Ashes should be scooped out of a cool stove with a small metal shovel.
Ashes should be placed in a metal container with a tight fitting lid. The
closed container of ashes should be placed on a non-combustible floor
or on the ground, well away from all combustible materials, pending
final disposal. If the ashes are disposed of by burial in soil or otherwise
locally dispersed, they should be retained in the closed container until
all the cinders have thoroughly cooled. Ashes can ignite up to 72 hours
after removal from the stove.
FUEL
This unit is designed and engineered to burn, dry, well-seasoned wood
only.
Please be patient with the heat output of your fireplace insert for the first
few weeks. The steel will go through a curing process that eliminates
moisture, which is deep in the steel and firebrick. This moisture will
reduce initial heat output of your fireplace insert and may make it difficult to start. After you have broken in the paint on the fireplace insert
it will be necessary to build hot fires to thoroughly remove the moisture
from the appliance. Running the fireplace insert with the draft fully open
for 1 to 1-1/2 hours after starting and adding generous amounts of fuel
during the first week or two should complete the curing process. We
recommend the use of a thermometer attached to the fireplace insert
top or chimney. Temperatures on the connector pipe should run in the
250-600 degree range. (DO NOT OVER FIRE THE STOVE DURING THIS
PROCESS. IF THE STOVE OR CHIMNEY BECOMES RED, REDUCE THE
AMOUNT OF AIR ENTERING THE STOVE IMMEDIATELY).
5
BRICK INSTALLATION
26
B
27
B
28
M
29
B
30
B
1
F
2
F
3
F
4
F
5
F
6
F
*
7
F
8
F
9
E
31
A
32
A*
34
A
33
A*
10
F
*
11
F
12
F
13
E
14
F
15
F
16
F
17
F
18
F
19
C
20
H
21
C
24 D 22 F 23 F 25 D
Canyon™ C310
CAUTION: Wear gloves during brick installation in case of sharp
edges behind the stove.
Note: Installation of the baffle boards and baffle blankets are easier when
you can still access the flue outlet, (before connecting the flue vent). Be
sure the baffle blankets are placed flat on the baffle boards so as not
to block exhaust flow to the flue.
reach over the baffle blanket to be sure it is completely flat on top of the
baffle boards.
1. Install bricks #1-34 in the numbered sequence as shown in Figure
2 (Note: Bricks 22-25 lean up against the lower air channel and butt
against bricks 17-21 on the bottom of the stove).
2. Next, you will install the baffle boards. All 4 baffle boards included
are the same size (15-1/2” X 6-3/16”). You will start by installing the
boards in the center part of the unit on top of the secondary tubes
to each side of the baffle support with the 15-1/2” side of the baffle
board going from the front to back of the unit. Once you have the
first two boards installed slide the board to the left side of the baffle
support all the way to the left and rear of the unit. You will slide the
board to the right side of the secondary support to the right and rear
of the unit. Next you will install the two remaining boards where you
originally installed the first two boards on each side of the baffle
support and pushed against the rear of the unit. The stainless steel
support hanger should be centered left to right between the sets of
baffle boards and placed as shown in Figure 4.
3. Also included with the unit are two 17” x 12-7/16” x 1” thick baffle
blankets. Install each blanket above the baffle board to each side of
the secondary support with the 17” side of the blanket from front
to rear of the unit. Make sure that the baffle blankets are to the full
rear of the unit.
Use a ruler or a piece of kindling to
Figure 2
Baffle
Insulation
Parts
Firebox Brick Layout
* These bricks go up against the stoves back wall
17”
1” Thickness
Two Baffle Blankets Per Unit
15-1/2”
12-7/16”
CAUTION: Make sure that the baffle blankets are centered side to
side and rest flat on the baffle boards and do not project beyond
the front edge of the baffle boards.
WARNING: IF THE BRICKS ARE NOT INSTALLED EXACTLY AS
SHOWN, THEY COULD FALL OUT OF PLACE DURING REFUELING
OR BURNING OF THE STOVE, CAUSING SERIOUS INJURY.
Canyon™ C310 Brick Sizes
(see Figures on this page)
Brick Sizes
6
A 3-7/8” X 8-3/4”
B 6-1/2” X 4-1/2”
C 3-1/2” X 9”
D 1-1/2” X 4-1/2”
E 3-7/8” X 9”
F 4-1/2” X 9”
H 3-1/2” X 4-1/2”
K 3” X 7”
M 4-1/2” X 4-1/2”
2-1/2”
Figure 3
Side Cut-A-Way
View of Firebox
Baffle Blankets
Side View
M Brick
1/2”
4-1/2”
M
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Firebox
Brick
Figure 4
1/2” Thickness
Four Baffle Boards Per Unit
6-3/16”
Baffle
Board
**
REQUIRED CLEARANCES
WARNING: BE ABSOLUTELY SURE THE DISTANCE BETWEEN THE
HEATER AND THE SURFACE OF ANY COMBUSTIBLE CONSTRUCTION IS NOT LESS THAN SHOWN ON THIS PAGE.
Model *A *B *C *D E(1)
15”
C310
C310 with
mantel
USA-30”
CAN-787mm
22”
559mm
USA -20”
CAN-584mm
12”
305mm
20”
508mm
381mm
20”
508mm8”200mm
and/or side
shields
Model F (1) G H J(2) M
C310
C310 with mantel
and/or side
610mm
24”
610mm
14-1/2”
368mm
14-1/2”
368mm
22-1/2”
572mm
22-1/2”
572mm
5-1/4”
133mm
5-1/4”
133mm
24”
shields
* Reduced clearances may be available for A, B, C and D dimensions
per NFPA 211 - latest edition, Standard for Chimneys, Fireplaces,
Vents and Solid Fuel-Burning Appliances (in Canada CSA B365 latest edition). See section on “Reduction of Appliance Clearance
with Specified Forms of Protection.”
** Side view of optional mantel deflector shown.
(1)Hearth extension reductions: 2” (51mm) reduction for 2” (51mm)
raised hearth. (USA and Canada) 24” minimum hearth extension
on all stoves as measured from the door opening of the unit (16"
[406mm] minimum hearth extension on all inserts as measured from
the door opening of the unit). Minimum distance of floor protection to
the side = 8” (200mm). This is measured from the sides of the door
opening in the USA and from the sides of the insert in Canada.
8”
200mm
8”
200mm
50-1/2”
1283mm
42-1/2”
1080mm
SIDE WALL
Figure 5
M
Figure 6
Maximum Mantel Depth = 9” (229mm)
COMBUSTIBLE MANTEL
Top Facing / Trim
B
D
Side Facing Material
C
E (USA)
F
Hearth Protection
A
Insert
Hearth Protection
Mantel
Trim
9”
229mm
J
E (Canada)
G
8” Ø
Flue Collar
H
(2)J = Maximum lintel depth without flue offset or smoke deflector.
C310
Depth Min. 14-3/4” (375mm)
Height Min.
Width Min. 30-1/2” (775mm)
Lintel Max. Depth
Without use of adjustable offset box or smoke deflector
u
u
u
Masonry Fireplace
UBC Chapter 37
22-3/4” (578mm)
5-3/4” (146mm)
Table 1 - Fireplace Sizing
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Note:
• Facing material that projects more than 3/4” (19mm) from the wall
is considered a mantel or side wall.
7
HEARTH PROTECTION
The hearth and/or floor protection must be a thermally rated non-combustible hearth/floor protector meeting or exceeding a thermal rating of
k=.84 or equivalent with a listed thickness of 3/4" (19mm) minimum in
USA and Canada. The covering must extend 24” (610mm) in front of the
heater and 8” (200mm) to either side (measured from door opening in
the USA and measured from the side of the unit in Canada).
Using Alternate Material As Floor / Hearth Protection
The hearth extension or alternate material used as a floor/hearth protector must be constructed of a durable noncombustible material having
an equal or better thermal conductivity value (lower k value) of k =.84
BTU/IN FT2 HR °F or a thermal resistance that equals or exceeds r = 1.19
HR °F FT2 IN/BTU with a minimum thickness of 3/4”. With these values,
determine the minimum thickness of the alternate material required using
the formula(s) and shown in Table 2.
Note:
Any noncombustible material having a minimum thickness of
3/4”(19 mm) whose k value is less than .84 or whose r value is more
than 1.19 is acceptable. If the alternate material used has a higher k value
or lower r value will require a greater thickness of the material used. In
some cases, if the k value is less or the r value higher, a thinner material
may be used.
Methods of determining floor protection equivalents:
To determine the thickness required for the alternate material when
either the "k" value or "r" value is known, use either the k formula or r
formula.
Example: If Micore 160 Mineral Fiber Board is to be used for the floor
protection, how thick must this material be?
kM = k value per inch of alternate material
rM = r value per inch of alternate material
TM = minimum thickness required for alternate material
TS = standard thickness of the alternate material
kL = k value per inch of listed material
rL = r value per inch of listed material
TL = minimum thickness of listed material
Note: An asterisk "*" indicates, it is a value taken from Table 2.
Using the k formula:
Minimum k-value (per Inch) of Specified min.
thickness of =
alternate material (kM) x thickness
alternate k-value (per inch) of listed
material (TM) of listed material (kL) material (TL)
TM (inches) = kM x TL
*.84
TM (inches) = *.35 x .75"
*.84
.312 (inches)= .417 x .75"
Answer - The minimum required thickness of the Micore 160 is .312"
therefore round up to nearest standard thickness available which is 3/8”
(.375”)
Using the r formula:
Minimum r-value (per Inch) Specified min.
thickness of =
of listed material x thickness
alternate r-value (per inch) of listed
material of alternate material material
TM (inches) =
r
L x T
rM
L
TM (inches) = *1.19 x .75"
*2.86
.312 (inches)= .416 x .75"
Answer - The minimum required thickness of the Micore 160 is .312"
therefore round up to nearest standard thickness available which is 3/8”
(.375”)
Listed Material
k (per inch) r (per inch) Listed Min. Thickness
Listed Material .84
** Approved Alternate Materials for Floor/Hearth Protection
Alternative Materials Thermal Values Minimum Thickness
Kaowool M Board .47 2.13 .42" (1/2")
Micore 160™
U.S. Gypsum
Micore 300™
U.S. Gypsum
Durock™ Cement Board
U.S. Gypsum
Hardibacker™ 1.95 .51 1.74" (1-3/4")
Hardibacker 500™ 2.30 .43 2.05" (2-1/8")
Cultured Stone Hearthstone™
Wonderboard 3.23 .31 2.88" (3")
Super Firetemp M
Johns-Manville
Super Firetemp L
Johns-Manville
Face brick 9.00 .111 8.04" (8-1/8")
Common brick 5.00 .20 4.46” (4-1/2")
Cement mortar 5.00 .20 4.46” (4-1/2")
Ceramic tile 12.5 .08 11.16" (11-1/4")
Marble ~11 ~.09 9.82" (9-7/8")
K
L
k (per inch)
K
M
.35 2.86 .31" (3/8")
.46 2.17 .41" (1/2")
1.92 .52 1.71" (1-3/4")
2.82 .35 2.52" (2-5/8")
.61 1.64 .54" (5/8")
.54 1.85 .48" (1/2")
1.19
r
L
r (per inch)
r
M
(rounded to nearest 1/8 inch)
3/4" (.75")
T
L
Min. Thickness
T
M
Table 2 - USA AND CANADA REQUIREMENTS
** If the hearth extension material(s) that is intended to be used is NOT listed
on Table 1, the material can still be used if the material(s) is noncombustible.
However, the manufacturer of the material must provide either the listed k-value
per inch or r-value per inch with listed thickness so that the minimum thickness
required for the hearth can be calculated (per instructions here or as specified
in the NFI Certification Manuals).
Note: Also see NFI (National Fireplace Institute) Certification Manuals show
ing other acceptable calculation methods and acceptable alternate materials
which can be used.
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