Lennox Hearth T300P User Manual

INSTALLATION AND OPERATION

FREESTANDING

PELLET FIRED

STOVES

RETAIN THESE

INSTRUCTIONS

FOR FUTURE

REFERENCE

These appliances must be properly installed and operated in order to
prevent the possibility of a house fire. Please read this entire owner's
manual before installing and using your pellet stove. Failure to follow
these instructions could result in property damage, bodily injury or even
death. Contact your local building or fire officials to obtain a permit and
information on any installation requirements and inspection require­ments in your area.

MANUAL

Freestanding Model

T300P Series

P/N 775025M, Rev. E, 12/03

IMPORTANT WARNINGS

CAUTION: Read this manual thoroughly before starting installation. For your safety, follow the installation, op­eration and maintenance instructions exactly without deviation. Failure to follow these instructions may result
in a possible fire hazard and will void the warranty. If this appliance is not properly installed, a house fire may
result. Contact local building or fire officials about restrictions and installation inspection in your area.

1. DO NOT CONNECT THIS UNIT TO A CHIMNEY
FLUE CONNECTED TO ANOTHER APPLIANCE.

2. Do not connect this appliance to air ducts or any air
distribution system.

3. Do not install a flue damper in the exhaust venting
system of this appliance.

4. Do not use class B venting intended for gas appli­ances as a chimney or connector pipe on a pellet­fired appliance.

5. The minimum clearances must be maintained for all
combustible surfaces and materials including; fur­niture, carpet, drapes, clothing, wood, papers, etc.
Do not store firewood within this clearance space.

6. INSTALLATION DISCLAIMER - This stoves exhaust
system works with negative combustion chamber
pressure and a slightly positive chimney pressure.
Therefore, it is imperative that the exhaust system
is gas tight and installed correctly. Since Lennox
Hearth Products has no control over the installa­tion of your stove, Lennox Hearth Products grants
no warranty, implied or stated for the installation or
maintenance of your stove, and assumes no re­sponsibility for any consequential damage(s).

7. Burning any kind of fuel consumes oxygen. If out­side air is not ducted to the appliance, ensure that
there is an adequate source of fresh air available to
the room where the appliance is installed.

8. This stove is not intended for use in commercial
installations other than where the stove is being
sold without prior approval from Lennox Hearth
Products.

9. The stove will not operate using natural draft, nor
without a power source for the blower and fuel
feeding systems.

10. Never use gasoline, gasoline-type lantern fuel,
kerosene, charcoal lighter fluid, or similar liquids to
start or "freshen up" a fire in this heater. Keep all
such liquids well away from the heater while it is in
use.

11. CONTINUOUS OPERATION: When operated cor­rectly, this appliance cannot be overfired. Continu­ous operation at a maximum burn can, however,
shorten the life of the electrical components (blow­ers, motors, and electronic controls), and is not
recommended. Typical approved operation would
include running at the low to mid range setting with
occasional running on the maximum setting during
the coldest periods of the winter. The blower speed
control should be turned to high when operating
the stove on the high heat setting.

12. CAUTION: NEVER PUT FINGERS NEAR AUGER.
Pellet fuel is fed to the UltraGrate by a screw au­ger. This auger is driven by a high torque motor.
The auger is capable of doing serious harm to fin-

Page 2

gers. Keep pellets in the hopper at all times and
keep fingers away from auger. The auger can start
and stop automatically at any time while the stove
is running.

13. CAUTION: HOT WHILE IN OPERATION. An appli­ance hot enough to warm your home can severely
burn anyone touching it. Keep children, clothing
and furniture away. Contact may cause skin burns.
Do not let children touch the appliance. Train them
to stay a safe distance from the unit.

14. APPROVED FUEL: This appliance is designed spe­cifically for use only with pelletized wood fuels
only. With its advanced UltraGrate technology,
this appliance is designed and approved for the
burning of wood residue pellets with up to 3% ash
content. This appliance is NOT approved to burn
cardboard, nut hulls, cherry pits, corn, etc. regard­less if it is in pellet form. Failure to comply with this
restriction will void all warranties and the safety
listing of the stove. Consult with your authorized
Lennox Hearth Products dealer for more informa­tion on approved pellet fuels.

15. FLY ASH BUILD-UP: For all wood pellet fuel­burning heaters, the combustion gases will contain
small particles of fly ash. This will vary due to the
ash content of the fuel being burned. Over time, the
fly ash will collect in the exhaust venting system
and restrict the flow of the flue gases. The exhaust
venting system should be inspected regularly and
cleaned as necessary.

16. SOOT FORMATION Incomplete combustion, such
as occurs during startup, shutdown, or incorrect
operation of the room heater will lead to some soot
formation which will collect in the exhaust venting
system. A precautionary inspection on a regular
basis is advisable to determine the necessity of
cleaning. The exhaust venting system should be
inspected regularly and cleaned as necessary.

17. DISPOSING OF ASHES: Any ashes removed from
the pellet stove must be deposited in a metal con­tainer with a tight-fitting lid. The closed container of
ashes should be placed on a noncombustible floor
or on the ground, well away from all combustible
materials, outside of the dwelling 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 cinders have
been thoroughly cooled.

18. SAVE THESE INSTRUCTIONS.

19. See the listing label on the stove body (or see
Safety / Listing Label, page 38).

TABLE OF CONTENTS

Important Warnings ................................................ 2

Testing / Listing, EPA, Using this Manual................ 3

Planning Your Installation ..................................... 4-6

Manufactured (Mobile) Home Installation ................7

Installation .......................................................... 7-15

Care and Operation .......................................... 16-21

Routine Maintenance........................................ 22-25

Specifications..........................................................26

Definitions ...............................................................27

Wiring Diagram .......................................................28

Troubleshooting ................................................ 29-30

Replacement Parts List / Diagrams .................. 31-34

Optional Accessories ..............................................35

Installation Tips .......................................................36

Simple Operating Instructions.................................37

Safety / Listing Label...............................................38

Ownership Records ................................................39

LISTING / TESTING

Listing: The listing laboratory is ITS (Intertek Testing Ser­vices) and the listing mark is Warnock Hersey.

Testing: In accordance with the specifications and proce­dures listed in UL 1482 & ASTM E1509 for solid fuel room
heater, this appliance has been independently tested to UL,
ULC and CSA standards. UL 1482 states requirements for
installations as a freestanding room heater. The safety list­ing label is located on an inside hopper surface of the pellet
stove. Please read this safety label carefully. It contains
important information about installation and operation of
this appliance. This appliance is tested and listed for resi­dential installation according to current national and local
building codes as:

• A Freestanding Room Heater

• A Manufactured (Mobile) Home Heater

EPA (Environmental Protection Agency)

Status: EPA Exempt - Pellet appliances that are de­signed with the combustion air supply exceeding the 35
to 1 (by weight) ratio are exempt from EPA regulations
and are “non-affected facilities.”

PRODUCT IS SUBJECT TO CHANGE WITHOUT NO­TICE.

CONGRATULATIONS ON THE PURCHASE OF YOUR
NEW PELLET STOVE MANUFACTURED BY LENNOX
HEARTH PRODUCTS.

When you purchased your new pellet stove, you
joined the ranks of thousands of concerned 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 pellet stove.

It is our goal at Lennox Hearth Products to provide
you, our valued customer, with an appliance that will
ensure you years of trouble free warmth and pleas­ure.

Thank you for selecting a Lennox Hearth Products
stove as the answer to your home heating needs.

Sincerely,
All of us at Lennox Hearth Products

PACKAGING LIST

The assembled pellet stove models T300P SERIES, are
packaged with an accessory package which contains the
following:

One - Installation and Operation Instructions Manual

One - Warranty

One - Power cord

One - Grate scraper

One - Wall thermostat

One - 20’ roll of 18 gage thermostat wire

One - Trivet, black decorative (for stove top)

One - Damper rod

Four - Levelers, leg, ¼-20x 1”

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. The home­owner’s Care and Operation Instructions included here
will assure you have many years of dependable and en­joyable service from your appliance.

Page 3

PLANNING YOUR INSTALLATION

QUESTIONS TO ASK LOCAL BUILDING OFFICIAL

A correct installation is critical and imperative for reduc­ing fire hazards and perilous conditions that can arise
when wood pellet burning appliances are improperly
installed. The installer must follow all of the manufac­turers’ instructions.

The installation of this appliance must conform to local
codes and applicable state and federal requirements.
Familiarity with these requirements before installation is
essential. Important considerations to discuss with local
building officials include:

1. Applicable codes (i.e. Uniform Mechanical Code,
State or Regional Codes)?

Electrical codes:

In USA, NEC, ANSI / NFPA 70-1987.
In Canada, CSA C22.1

Power Supply Requirements

must be plugged into a standard, 115 volt, 60 Hz
grounded electrical outlet. The approximate
power requirement is 200 watts, and will peak up
to 700 watts for approximately 6 minutes when
the self-igniter is operating (it will turn off 2 min­utes after flame detection). The power supply
cord must be routed to avoid contact with any of
the hot or sharp exterior surface areas of the
stove. When installed in a manufactured (mobile)
home appliance must be electrically grounded to
the steel chassis (see page 7, Manufactured
(Mobile) Home Requirements for additional re­quirements). These requirements must be met
unless otherwise specified by state or local au­thorities.

WARNING - Electrical Grounding Instructions:
This appliance is equipped with a three-prong
(grounding) plug for your protection against
shock hazard and should be plugged directly
into a properly grounded three-prong recep­tacle. Do not cut or remove the grounding
prong from this plug.

2. Local amendments?

3. Is a permit required - cost?

You may wish to contact your insurance company

to ask if they require this.

4. Is outside combustion air required?

5. Rooms where the installation is not allowed?

– The power cord

INSTALLATION / MAINTENANCE STANDARDS

National Fire Protection Association – The primary
NFPA standard that refers to installation and mainte­nance of pellet appliances and venting is NFPA 211:
Chimneys, Fireplaces, Vents, and Solid Fuel appli­ances, Jan. 2000.

SELECTING A LOCATION
The design of your home and where you place your
stove will determine its value as a source of heat. A
wood stove depends primarily on air circulation (con­vection) to disperse its heat, and therefore, a central
location is often best. There are other practical consid­erations, which must be considered before a final selec­tion of locations is made.

♦ Existing Chimneys
♦ Pellet Fuel Storage
♦ Aesthetic Considerations
♦ Roof Design (rafter locations & roof pitch)
♦ Room Traffic
♦ Proximity to Combustibles
♦ Electrical Wiring

The installation of this stove will require some research.
Once your options are determined, consult with your
local building department who will be able to give you
the necessary installation requirements for your area (Is
a building permit required, rooms where installation may
not be allowed, etc.).

WARNING: Check all local building and safety
codes before installation. The installation instruc­tions and appropriate code requirements must be
followed exactly and without compromise. Altera­tions to the stove are not allowed. Do not connect
the stove to a chimney system serving another
stove, appliance, or any air distribution duct. Failure
to follow these instructions will void the manufac­turers warranty.

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
stove). 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.

Page 4

PLANNING YOUR INSTALLATION

FLOOR PROTECTION

This appliance requires noncombustible floor protection. If the floor protection is to be stone, tile, brick, etc., it must be mor­tared or grouted to form a continuous non-combustible surface. If a chimney connector extends horizontally over the floor,
the protection must cover the floor under the connector and at least 2" to either side.

A noncombustible floor protector must fully cover the area beneath the appliance and extend 6” to the front, 6” to the
sides, and up to 6" from the back as illustrated below.

*Note: When installed at clearances less than 6”, floor protection is only required to extend to the wall.

T300P SERIES

6"

(153mm}

* Up to 6"/153mm
minimum

6"

6"

(153mm}

(153mm}

Page 5

PLANNING YOUR INSTALLATION

Clearances to combustibles are determined from testing to applicable standards for allowable heat transfer.
The clearances allowed as shown here, do not take into account operation or serviceability requirements.

CLEARANCES

Standard residential or manufactured (mobile) home instal­lation. These appliances require the following minimum
clearances to combustibles:

MINIMUM CLEARANCES TO COMBUSTIBLES

Model: T300P
Series

 Clearance to
Combustibles

A - Sidewall to unit
B - Backwall to

unit
C - Sidewall to unit
Corner
D - Max. Depth of
Alcove
E - Flue to Wall 3” / 77 mm 3” / 77 mm

♦ Measured to outside projection of cast stove top

• Minimum Alcove Measurements: Height 48” / 1220 mm

Width 41” / 1042 mm

Minimum clearances specified may not allow for ease
of operation and maintenance (please take this into
account when planning the installation). If installed to
the minimum clearances, removal of the appliance may
be necessary for servicing.

Manufactured (Mobile) Home
or Residential Installation
Horizontal Flue –
Directly Through
Wall
inch / millimeter inch / millimeter

♦6” / 153 mm ♦6” / 153 mm
2” / 51 mm 9” / 229 mm

2” / 51 mm 2” / 51 mm

•18” / 458 mm •18” / 458 mm

Interior Vertical
Flue

Rear Wall or Alcove

Corner

Page 6

INSTALLATION

MANUFACTURED (MOBILE) HOME INSTALLATION

Model –T300P Series
In addition to the standard installation instructions, the
following instructions may be required by local, state or
federal building codes:

• Stove must be permanently bolted to the floor.

• An outside air inlet must be provided for combustion

and be unrestricted while unit is in use.

• Stove must be permanently electrically grounded to

the steel chassis of the home. The location selected
for ground attachment to the stove must be dedicated
for this purpose.

• See pages 10 through 15 for additional information on

venting requirements.

• Do not install appliance in a sleeping room.

• The structural integrity of the manufactured home

floor, walls, ceiling and roof must be maintained.

NOTE: The grounding of this product, at installation,
must comply with NFPA-70 standards, CSA C22.1 in
Canada, as well as any local codes.

Model - T300P SERIES

Floor

Bolt

MANUFACTURED (MOBILE) HOME EXHAUST VENT
PIPE INSTALLATION GUIDELINES

Use only listed type “PL” pellet vent pipe. Pipe should
extend at least 3 feet above the part of the roof through
which it passes. The top of the pipe should be at least 2
feet above the highest required elevation of any part of
the manufactured (mobile) home within 10 feet of the
pipe.

If the exhaust vent exits the manufactured (mobile)
home at a location other than the roof, and exits at a
point 7 feet or less above the ground level on which the
manufactured (mobile) home is position a guard or
method of enclosing the pipe shall be provided at the
point of exit for a height of up to 7 feet. The openings, if
any, in this guard shall not allow a 3/4” rod to pass
through. A 1/2” rod could pass through but should not
be able to touch the pipe when inserted through the
opening a distance of 4 inches.

Floor
Protector

Page 7

REMOVING APPLIANCE FROM PALLET

1. After removing the packaging from the stove, lift the
hopper lid, and remove all pre-packaged items that
were shipped in the hopper. Next, open the stove
door and remove all pre-packaged items.

2. Remove screws which secure legs to pallet.

INSTALLING LEG LEVELING BOLTS

The four leg leveling bolts (included in accessory pack­age), are provided for leveling the stove if necessary.
To install, thread the bolts into the existing holes in the
bottom of each leg. Turn the leveling bolts to adjust for
correct height.

INSTALLATION CHECK LIST

It is strongly recommended that you have an authorized
Lennox Hearth Products dealer install your stove. If you
install your stove yourself, you should review your in­stallation plan with your authorized Lennox Hearth
Products dealer.

Check list:

Check off each item as you proceed with the installation
process.

 Read the ENTIRE stove installation section first.
 Determine the appropriate measurements and loca-

tions for your installation.

 Follow the general installation directions under

Stove Installation and the installation section ap­propriate to your stove.

 Be sure to pre-fit all items before you install, fasten,

or set up the stove permanently.

Prior to lighting your stove:

 Review the safety precaution section.
 Review the pellet fuels section.
 Review and follow the Operating Instructions.
 Plug power cord connector into corresponding con-

nector on the back of appliance (see illustration on
page 9 showing connector locations).

After you have begun operation of your stove:

 Review the routine cleaning / maintenance informa-

tion.

 Enjoy the warmth from your new Lennox Hearth

Products pellet stove!

INSTALLATION

DAMPER ROD INSTALLATION

1. Locate rectangular cutout on bottom stove panel
behind ash pan.

2. Screw damper rod into threaded hole.

DAMPER ADJUSTMENT

The damper rod is located under the bottom plate, on
the right hand side of the stove, just behind the ash
pan. It is very important to preset your damper prior to
burning your pellet stove.

The damper plate contains nine notches spaced in 1/4”
increments that aid in positioning (see Fig. A).

Fig. A

For initial setup, push the damper all the way in (when
facing the front of the stove, “in” is to the left, and “out”
is to the right) and slowly pull back three notches (see
Fig. B).

Pulled Back

3 Notches

Fig. B

This setting should provide an adequate air to fuel ratio
for most installations.

Page 8

INSTALLATION

THERMOSTAT INSTALLATION:

NOTE: Always Disconnect Power Before Perform­ing The Thermostat Installation.

A 24-volt wall thermostat and 20 feet of 18-gage ther­mostat wire is included in your stoves accessory pack­age. It is recommended that the thermostat and ther­mostat wire be installed by an authorized Lennox
Hearth Products dealer.

Installation Steps:

1. Unplug stove power cord from the wall outlet.

2. Locate the thermostat terminal block (see illustra­tion).

3. Loosen the two terminal screws on the terminal
block and remove the jumper.

4. Connect the two wires from your thermostat to the
terminals (one per terminal). Ensure that the purple
wires from the harness remain connected to the ter­minal block and tighten the terminal screws. Make
sure the wires are firmly connected to the thermo­stat.

5. Plug in the stove and you are ready to operate with
your thermostat!

IMPORTANT: IF THE WALL THERMOSTAT PRO­VIDED IS NOT USED, THE JUMPER IS REQUIRED
FOR THE STOVE TO OPERATE.

Terminal Block for Thermostat

Leave Jumper on, If Thermostat Is Not

Used

Model T300P Series

(viewed from stove back)

Remove Jumper if Thermostat Is

Jumper

To Be Used

Page 9

INSTALLATION

VENTING REQUIREMENTS

It is recommended that only an authorized dealer install
your pellet stove. The specified installation requirements
must be followed to ensure conformity with both the
safety listing of the appliance and local building codes. All
clearances, installation instructions and precautions
specified by the vent manufacturer must be followed.

Selecting a Location - Review the appliance clearance
requirements before installing the venting system (see
Clearances, page 6). Position the appliance far enough
away from walls to allow adequate room for servicing.
Choose the appliance location with the least amount of
interference with the house framing, plumbing, wiring,
etc.

Preferred Vent Configuration – For the best perform­ance, we recommend a vent run design which runs verti­cally and terminates above the roofline. This design will
allow natural draft to improve the flow of flue gases and
will aid in combustion and stove performance.

Type of Pipe – This stove requires type “PL” (pellet vent
pipe, sometimes referred to as “L-Vent pellet vent”),
which conforms to UL standard 641. Connect the pellet
vent pipe or the “tee” to the flue collar using a minimum of
three screws and seal as specified in “Pipe Joint Re­quirements” on this page. Do not use class B gas chimney
or single wall chimney as a substitute.

Size of Pipe -These pellet appliances are approved for
use with the following vent sizes: 3” (75mm) standard, or
4” (100mm). See page 12 for determining correct size
vent to use. Use a 3” (75mm) to 4” (100mm) adapter
(Cat. No. 14M81) or a 3” (75mm) to 4” (100mm) “tee” in
order to run 4” (100mm) pipe.

Offsets - In every installation, a single or double clean­out “tee” is recommended for every ninety-degree offset
(this tee will help collect ash residue and will allow for
routine cleaning without the need to disconnect sections
of pipe).

Note: Offsets and horizontal runs accumulate fly ash and
soot which reduces the exhaust flow and performance of
the stove.

Total Offsets in venting system should not exceed 270°
total in direction change.

Horizontal Runs - The maximum total horizontal run
must not exceed 10 feet (3.1 meters).

Horizontal run of pipe requires 1/4” / 7 mm rise per foot.

Pipe Clearances / Requirements – See pipe manufac­turers instructions for installation of venting components
and clearances. Follow pipe manufacturers installation
precautions for passing pipe through a combustible wall
or ceiling (i.e. use an approved thimble).

Notes:
All pellet vent pipe requires 3” (75mm) clearance from
outside of pipe unless otherwise specified by vent manu­facturer.

A support bracket should be installed every 4’ (1.2m) of
pellet vent pipe on the exterior wall of the house unless
otherwise specified by vent manufacturer.

Pipe / Liner Joint Requirements - All pipe joints must
be secured with a minimum of 3 screws. ALL horizontal
joints must be sealed gas tight. Use RTV silicone with a
rating of at least 570° F (969° C), or Interam to provide a
complete seal at the flue collar and on all joints.

Connection to Masonry Chimney through a Wall - Be
sure to verify the construction of a masonry chimney, as it
may have combustible framing.

The use of single wall flex or rigid 24 gage stainless steel
pipe as a liner is approved.

Connection to an Existing Class A Chimney - A chim­ney adapter can be used to make the connection from 3”
/ 75mm or 4” / 100mm pellet vent pipe to existing UL
chimney system. Verify with the pipe manufacturer that
your pipe brands will interconnect. The use of single wall
flex or rigid pipe (24 gage stainless steel) as a liner is
approved.

Direct-Vent Installations (Horizontal): On all direct-vent
installations (short, horizontal runs with no vertical pipe);
care should be taken when choosing a location for termi­nating the vent. It is not recommended to directly vent the
exhaust on the prevailing wind side of the house. It is
recommended that when an appliance is vented directly
through a wall, a minimum of 8’ (2.5M) of vertical pipe
should be installed to create some natural draft. This will
reduce the possibility of smoke or odor entering the
dwelling during appliance shutdown or loss of power.

PAGE 10

INSTALLATION

A

A

VENT TERMINATION

Do not terminate vent in an enclosed or semi-enclosed
area such as: carports, garage, attic, crawl space, under
a deck, porch, narrow walkway, closely fenced area, or
any location that can build up a concentration of fumes
such as a stairwell, covered breezeway, etc.

Vent surfaces can get hot enough to cause burns if
touched. Adults should supervise children when they are
in the area of a hot stove. Non-combustible shielding or
guards may be required.

Termination Cap: The termination of the outside chim­ney of the pellet stove shall be located in accordance with
the following:

A. Higher than 3’ (.92M) above any forced air inlet (air

conditioner, etc.) located within 10’ (3M).

B. Not less than 4’ (1.2M) below, 4’ (1.2M) horizontally

from or 1’ (3.1M) above any gravity air inlet (door,
window, etc.) which flue gases could re-enter the
dwelling.

C. Not less than 2’ (.6M) from combustible materials

such as an adjacent buildings, fences, protruding
parts of the structure, roof overhang, plants and
shrubs, etc. and not less than 7’ (2.1M) above grade
when located adjacent to the public sidewalks (ac­cess). The final termination of the exhaust system
must be configured so that flue gases do not jeopard­ize the safety of people passing by, overheat com­bustible portions of nearby structures or enter the
dwelling.

D. Not less than 3’ (.92M) below an eave (maximum

overhang of 3’ (.92M) or any construction that pro­jects more than 2” (51mm) from the plane of the wall.

E. The distance from the bottom of termination to grade

is 12” (305mm) minimum. This is conditional upon
plants and nature of grade surface: Be careful to
choose a location for the vent termination which does
not expose people or shrubs to high heat from the
exhaust gases. The exhaust gases are not hot
enough to ignite grass, plants and shrubs located in
the vicinity of the termination although they should be
a minimum of 3’ (.92M) away. The grade surface un­der the termination must not be a lawn.

F. Since sparks may escape from the exhaust pipe of

any stove, use caution when positioning the vent
pipe. Refer to pipe manufacturer’s instructions when
installing and terminating the exhaust. The vent pipe
should be horizontal and never run the pipe in a
downward direction (recommend a ¼” (7mm) rise
per foot horizontal).

Note: It is not recommended to terminate exhaust vent
on the prevailing wind side of the house.

Chimney Height Requirements

The vent termination height required is 12” minimum
above the roof penetration point as illustrated below (Ref.
National Standard, NFPA 7-4.1). Check with your local
building official for additional requirements for your area.

REQUIRES A

LISTED

TERMINATION

✸

CAP

12” MIN

TERMINATION MUST BE

T LEAST 12” (305mm)

BOVE THE HIGHEST
POINT WHERE IT PASS­ES THROUGH THE ROOF
SURFACE.

Manufactured (Mobile) Home
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.

REQUIRES A LISTED
TERMINATION CAP

✸

TOP OF FLUE MUST BE 2’
HIGHER THAN ANY PART OF
ROOF WITHIN 10’ HORIZONTAL

TOP OF FLUE MUST BE 3’
HIGHER THAN HIGHEST POINT
OF ROOF PENETRATION

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. NFPA 7 – 4.1.2, Vents installed with a listed cap
shall terminate in accordance with the terms of the cap’s
listings.

PAGE 11

INSTALLATION

r

DETERMINING SIZE OF PIPE TO INSTALL

To determine what diameter pipe to use in an installation (3” or 4”), first find the “equivalent pipe length” using the follow­ing guidelines, then plot this figure and the altitude on the chart.

Fill out the installation chart, and calculate your total equivalent pipe length. After you have the total equivalent pipe
length, use the Pipe Selection Chart below to determine if your installation requires 3” or 4” exhaust pipe

INSTALLATION CHART

Type of
Pipe

# of Elbows
or Feet of
pipe

Equivalent

Feet

Total
Equivalent
Feet

SAMPLE INSTALLATION CHART
Type of
Pipe

# of El­bows or

Equivalent

Feet
Feet of
pipe

90o Elbows x 5 Ft. (1.5M)
45o Elbows x 3 Ft. (1M)

Horizontal
Pipe
Vertical Pipe x .5 Ft.

x 1 Ft. (.3M)

(.15M)

A- 90 Degree Elbow E- 8’ Vertical Pipe
B- 1’ Horizontal Pipe F- 2’ Horizontal Pipe
C- 45 Degree Elbow G- 90 Degree Tee
D- Standoff Braces
H- Wall Thimble

90o Elbows /
Tee (A & G)
45 o
Elbows (C)
Horizontal
pipe (B & F)
Vertical pipe
(E)
Total = 20

PIPE SELECTION CHART

30

2 x 5 Ft. (1.5M) 10 (3M)

1 x 3 Ft. (1M) 3 (1M)

3 x 1 Ft. (.3M) 3 (1M)

8 x .5 Ft. (.15M) 4 (1.2M)

NOTE: All equivalent pipe styles shown to the right are
standard for all freestanding models.

20

4 “ Diameter Only

3 or 4”

10

Diamete

.

Total
Equiva­lent Feet

0

0 1 2 3 4 5 6 7 8 9 10

Equivalent Pipe Length (Feet)

Altitude x 1000 Feet

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