Drolet HeatPack DF00500 User manual

45867A
Printed in Canada 19-03-2019
Installation and operating instructions for the
HEATPACK WOOD FURNACE
( DF00500 model)
Verified and tested for Canada
and the United States
by an accredited laboratory
Stove Builder International Inc.
250, rue de Copenhague,
St-Augustin-de-Desmaures (Quebec)
Canada G3A 2H3
After-sale service: 418-908-8002
E-mail: [email protected]
This manual is available for free download on the manufacturer’s web site. It is a
copyrighted document. Re-sale is strictly prohibited. The manufacturer may update this
manual from time to time and cannot be responsible for problems, injuries, or damages
arising out of the use of information contained in any manual obtained from unauthorized
sources.
Please keep this document!
READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING AND
OPERATING YOUR FURNACE.
PLEASE KEEP THIS MANUAL FOR REFERENCE

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THANK YOU FOR CHOOSING THIS DROLET WOOD FURNACE
As one of North America’s largest and most respected wood stove, furnace and fireplace
manufacturers, Stove Builder International takes pride in the quality and performance of all
its products. We want to help you get maximum satisfaction as you use this product.
In the pages that follow you will find general advice on wood heating, detailed instructions
for safe and effective installation, and guidance on how to get the best performance from
this furnace as you build and maintain fires, and maintain your wood heating system.
Congratulations on making a wise purchase.
When this furnace 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.
Please read this entire manual before you install and use your new furnace. Failure
to follow instructions may result in property damage, bodily injury, or even death. It
is important that you follow the installations guidelines exactly.
You may need to obtain a building permit for the installation of this furnace and the
chimney that it is connected to. Consult your municipal building department or fire
department before installation to determine the need to obtain one. We recommend
that you also inform your home insurance company to find out if the installation will
affect your policy.
REGISTER YOUR WARRANTY ONLINE
To receive full warranty coverage, you will need to show evidence of the date you
purchased your unit. Keep your sales invoice. We also recommend that you register
your warranty online at
https://www.drolet.ca/en/warranty/warranty-registration/
Registering your warranty online will help us track rapidly the information we need on
your unit.

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Table of contents
PART 1 – INSTALLATION.............................................................................6
1 Introduction .............................................................................................6
2 Regulations and safety warnings covering installation .......................7
2.1 Regulations covering furnace installation.................................................................... 7
2.1.1 Cautions and warnings covering installation ......................................................................7
3 Furnace contents ....................................................................................8
3.1 Combustion chamber.................................................................................................. 8
3.2 Heat exchangers......................................................................................................... 8
3.3 Crate ........................................................................................................................... 8
3.4 User manual................................................................................................................ 8
4 Authorized and non-authorized installation configuration ..................9
4.1 Authorized installation configuration in Canada and United States............................. 9
4.2 Authorized installation configuration in United States only.......................................... 9
4.2.1 Parallel installation.............................................................................................................9
4.3 Non-authorized installation configuration .................................................................. 10
4.3.1 Non-authorized installation configuration in Canada and United States ...........................10
5 Positioning the unit and clearances to combustible materials..........10
5.1 Unit positioning ......................................................................................................... 10
5.2 Certification label ...................................................................................................... 10
5.3 Clearances to combustible material.......................................................................... 11
5.3.1 Clearances to combustibles materials .............................................................................11
5.3.2 Cold air return ductwork Clearances................................................................................12
5.3.3 Clearances to combustibles materials for hot air distribution duct....................................13
5.4 Floor protection......................................................................................................... 13
6 The exhaust system..............................................................................14
6.1 The chimney ............................................................................................................. 14
6.1.1 Factory-built metal chimneys ...........................................................................................14
6.1.2 Masonry chimneys...........................................................................................................15
6.1.3 Minimum chimney height .................................................................................................15
6.2 The exhaust pipe / Flue collar................................................................................... 16
6.2.1 Installation code requirements .........................................................................................16
7 Hot air distribution and air return system ...........................................18
7.1 Hot air distribution plenum height according to ceiling height ................................... 18
7.1.1 Plenum’s minimum height (Plenum B only)......................................................................18
7.1.2 Adjustable height of the plenum; (with the plenum extension cut off A)............................19
7.1.3 Adjustable height of the plenum (A and B).......................................................................19
7.2 Assembling the plenum extension (A) and the hot air distribution plenum (B). ......... 20

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7.2.1 Assembling the plenum extension (A)..............................................................................20
7.2.2 Assembling the hot air distribution plenum (B).................................................................21
7.2.3 Assembling the plenum extension (A) with the plenum (B) ..............................................22
7.2.4 Installing the start-off adapters.........................................................................................23
7.3 Installation of the assembled plenum on the furnace ................................................ 24
7.3.1 Minimum amount of outlets and maximum lengths of ducts.............................................25
7.3.2 Static pressure calibration ...............................................................................................27
7.4 Air return system and filter ........................................................................................ 27
8 Combustion air......................................................................................27
9 Electrical connection, adjustment of components and calibration of
the draw .................................................................................................28
9.1 Raccordement électrique .......................................................................................... 28
9.2 Installation and connection of the “RTD” thermal probe............................................ 30
9.2.1 With plenum (B) only .......................................................................................................30
9.2.2 With the plenum extension (A) and the plenum (B)..........................................................32
9.3 Blower technical Data ............................................................................................... 34
9.4 Draw Calibration ....................................................................................................... 34
9.4.1 The use of a thermometer ...............................................................................................35
Appendix 1: Optional thermostat installation...........................................36
Appendix 2: Optional air filters (AC01390, AC01391) ..............................39
Appendix 3: Optional Air return adapter (AC01392) ................................40
PART 2 – OERATION, MAINTENANCE AND TROUBLESHOOTING ........41
9.5 How to prepare or buy good firewood ....................................................................... 41
9.5.1 What is good firewood? ...................................................................................................41
9.5.2 Tree species....................................................................................................................41
9.5.3 Log length........................................................................................................................41
9.5.4 Piece size ........................................................................................................................42
9.5.5 How to dry firewood.........................................................................................................42
9.5.6 Judging firewood moisture content ..................................................................................43
10 Operating your furnace.........................................................................44
10.1 Your first fires............................................................................................................ 44
10.2 Lighting fires.............................................................................................................. 44
10.2.1 Conventional fire starting .................................................................................................44
10.2.2 The top down fire.............................................................................................................45
10.2.3 Two parallel logs..............................................................................................................45
10.2.4 Using fire starters ............................................................................................................45
10.3 Maintaining wood fires .............................................................................................. 45
10.3.1 General advice ................................................................................................................45
10.3.2 Raking charcoal...............................................................................................................46
10.3.3 Firing each new hot load..................................................................................................47

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10.3.4 Control of the air supply...................................................................................................47
10.3.5 Building different fires for different needs.........................................................................48
10.3.6 Control of the air inlet damper..........................................................................................49
10.4 Additional fresh air supply......................................................................................... 50
10.5 Manual or thermostat control .................................................................................... 51
10.6 Ash drawer................................................................................................................ 51
10.7 Prolonged power outage........................................................................................... 52
11 Maintaining your wood heating system ..............................................52
11.1 Furnace maintenance ............................................................................................... 52
11.1.1 Ash removal ....................................................................................................................52
11.1.2 Cleaning door glass.........................................................................................................52
11.1.3 Door adjustment ..............................................................................................................53
11.1.4 Replacement of the glass and gaskets ............................................................................54
11.1.5 Cleaning and painting the furnace ...................................................................................55
11.1.6 Heat exchangers care......................................................................................................56
11.2 Chimney and chimney connector maintenance ........................................................ 59
11.2.1 Why chimney cleaning is necessary ................................................................................59
11.2.2 How often should you clean the chimney?.......................................................................59
11.2.3 Cleaning the chimney ......................................................................................................59
11.3 Smoke pipe inspection.............................................................................................. 60
11.4 Blower motor maintenance ....................................................................................... 60
12 Troubleshooting....................................................................................61
12.1 Installation of secondary air tubes............................................................................. 62
12.2 Baffle removal or replacement .................................................................................. 63
13 Exploded diagram and parts list ..........................................................64
PART 3 – FEATURES AND SAFETY ..........................................................73
14 General information on HeatPack (DF00500) ......................................73
14.1 Appliance performance
(1)
.......................................................................................... 73
14.2 General Features...................................................................................................... 74
14.2.1 Technical data HeatPack.................................................................................................75
14.3 The benefits of low emissions and high efficiency .................................................... 77
14.4 The SBI commitment to you and the environment .................................................... 77
14.4.1 What is your new furnace made of?.................................................................................77
15 Safety information.................................................................................78
15.1 Cautions and warnings ............................................................................................. 78
15.2 Smoke detector......................................................................................................... 80
15.3 Chimney fire.............................................................................................................. 80
DROLET LIMITED LIFETIME WARRANTY.................................................81

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PART 1 – INSTALLATION
Refer to Part 2 of this manual for operation, maintenance and troubleshooting instructions.
Refer to Part 3 of this manual for the furnace features and safety instructions.
1 Introduction
This furnace uses the same wood burning technology as a high efficiency certified CSA
B415.1-10. This model meets the emissions limits of CSA B415.1-10 Standard.
We recommend that our woodburning hearth products be installed and serviced by
professionals who are certified in the United States by NFI (National Fireplace Institute
®
) or
in Canada by WETT (Wood Energy Technical Training) or in Quebec by APC (Association
des Professionnels du Chauffage).
ATTENTION
FOR INSTALLATION OF A CENTRAL HEATING VENTILATION SYSTEM, IT IS HIGHLY
RECOMMENDED TO CONSULT A HEATING SYSTEM VENTILATION SPECIALIST.
WARNING
STOVE BUILDER INTERNATIONAL INC. IS NOT RESPONSIBLE FOR POOR
APPLIANCE PERFORMANCES, DUE TO IMPROPER INSTALLATION OF EXHAUST
SYSTEM OR DUCTING.
BEFORE STARTING THE INSTALLATION
•READ THE ENTIRE MANUAL AND MAKE SURE YOU UNDERSTAND IT. (IF IN
DOUBT, CONTACT OUR CUSTOMER SERVICE). FAILURE TO COMPLY WITH
THIS MANUAL MAY RESULT IN HAZARD TO YOUR SAFETY AND WILL VOID
YOUR WARRANTY.
•INSPECT THE FURNACE TO MAKE SURE THAT NOTHING HAS BEEN DAMAGED
IN THE SHIPPING. PULL OUT THE TOOLS FROM THE FLUE PIPE AND/OR
EXCHANGERS AND FIREBOX OF THE FURNACE.

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2 Regulations and safety warnings covering installation
2.1 Regulations covering furnace installation
WARNING
FOLLOW LOCAL CODES IF IN DOUBT, CONTACT YOUR LOCAL HEATING
APPLIANCE RETAILER, YOUR MUNICIPALITY OR YOUR FIRE DEPARTMENT.
Installation must be made in accordance with the following standards :
Canada −CSA-B365 «Installation code for solid-fuel-burning appliances and equipment».
−CSA C22.1 «Canadian electrical code».
United-States −NFPA 90B «Standard for the installation of warm air heating and air- conditioning systems».
−NFPA 70 «National Electrical Code».
2.1.1 Cautions and warnings covering installation
•THE INFORMATION GIVEN ON THE CERTIFICATION LABEL AFFIXED TO THE
APPLIANCE ALWAYS OVERRIDES THE INFORMATION PUBLISHED, IN ANY
OTHER MEDIA (OWNER’S MANUAL, CATALOGUES, FLYERS, MAGAZINES
AND/OR WEB SITES).
•AIR DUCTS SERVING A GARAGE SHOULD NOT BE CONNECTED TO OTHER
PARTS OF A HOUSE AND THE DUCTING SERVING A HOUSE SHOULD NOT BE
CONNECTED TO A GARAGE.
•THIS STOVE HAS BEEN DEVELOPED AND BUILT FOR RESIDENTIAL
SUPPLEMENTARY HEAT SOURCE. COMMERCIAL AND INDUSTRIAL USE IS
PROHIBITED AND WILL VOID THE WARRANTY.
•MIXING OF CHIMNEY COMPONENTS FROM DIFFERENT SOURCES OR
MODIFYING FURNACE COMPONENTS MAY RESULT IN HAZARDOUS
CONDTIONS.
•ANY MODIFICATION OF THE APPLIANCE THAT HAS NOT BEEN APPROVED IN
WRITING BY THE TESTING AUTHORITY VIOLATES CSA B365 (CANADA), AND
NFPA 90B (USA).
•CONNECT THIS FURNACE ONLY TO A LISTED UL 103 HT OR ULC S629
FACTORY-BUILT CHIMNEY FOR USE WITH SOLID FUEL OR TO A LINED
MASONRY CHIMNEY CONFORMING TO NATIONAL AND LOCAL BUILDING
CODES.
•IF REQUIRED, A FRESH AIR RETURN ADAPTOR KIT (SOLD SEPARATLY) CAN
BE INSTALLED TO SUPPLY COMBUSTION AIR TO THE ROOM OR SPACE.

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•DO NOT STORE NEAR WOOD FURNACE. RESPECT THE PRESCRIBED
CLEARANCE BETWEEN COMBUSTIBLES AND HEAT.
•DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING ANOTHER
APPLIANCE.
•DO NOT INSTALL IN A MOBILE HOME.
•DO NOT INSTALL IN ALCOVE.
3 Furnace contents
3.1 Combustion chamber
The following parts can be found in the combustion chamber
•User manual kit
•Moisture absorber pack
3.2 Heat exchangers
The following parts can be found in the heat exchangers :
•Heat exchanger scraper
•Poker
3.3 Crate
The following parts can be found in the wooded crate :
•Furnace
•Boxes 1 & 2 : 6"adapter for hot air distribution plenum (5 adapters in each box)
•Box 3 : Hot air distribution plenum and plenum extension
oHot air distribution plenum panels (5 panels)
oPlenum extension panels (4 panels)
oLids (4)
oCorners reinforcements (4)
3.4 User manual
The following parts can be found in the user manual
•User manual
•Coil handle
•RTD sensor
•Ash drawer handle
•RTD sensor support
•Moisture reader
•Screw #8 - 32 x 5/16'' truss quadrex zinc (2X)
•Black metal screw #10 x 1/2" type "a" pan quadrex (16X)
•Metal screw #8 x 1/2" pan square tek black self drilling (35X)
•Black screw #10 x 5/8" robertson type A (53X)

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4 Authorized and non-authorized installation configuration
4.1 Authorized installation configuration in Canada and United States
The wood furnace is the only appliance connected to the hot air distribution duct system
and air return duct system.
4.2 Authorized installation configuration in United States only
4.2.1 Parallel installation
(A) represents the wood furnace.
(B) represents the gas, oil or
electric existing furnace.
Power input (B) should be equal to
or greater than (A).
Each furnace must have its own
air return duct system.
The highest clearances of (A and
B) hot air distribution ducts must
be respected.
Static pressure of (A) must be
adjusted to 0.20 in. W.C. (50 Pa).
A backflow damper must be
installed to prevent air return in
one or the other of the two furnaces and to ensure that hot air will flow into the house and
will not return through the plenum of the other furnace. Depending on your system
configuration, it is possible that more than one register is required to prevent air returns in
the different hot air
ducts.

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4.3 Non-authorized installation configuration
4.3.1 Non-authorized installation configuration in Canada and United States
•The hot air distribution duct of the
furnace (A) must not be installed in the
air return duct of the furnace (B).
•The hot air distribution duct (B) must not
be installed in the air return duct of the
furnace (A).
5 Positioning the unit and clearances to combustible
materials
To reduce the risk of vibration, the furnace must be leveled in both directions and
supported evenly to ensure stability.
5.1 Unit positioning
The furnace must be installed where outside air supply will be sufficient for proper
combustion. If required, a fresh air return adaptor kit (sold separatly) can be installed to
supply combustion air to the room or space.
The furnace must be positioned so that the flue pipe is as short as possible. Minimize the
use of 90° elbows.
The owner must ensure a proper installation to allow a safe operation of the appliance.
The owner must ensure cleanliness of the room in the event of negative pressure or
temporarily negative pressure.
5.2 Certification label
WARNING
THIS APPLIANCE MUST BE INSTALLED IN ACCORDANCE WITH THE
INSTRUCTIONS ON THE CERTIFICATION LABEL APPLIED ON THE UNIT.

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Location: You will find the certification label on the back of the appliance.
Information found on the certification label always overrides the information published in
any other publication.
Content of certification label: Model number, serial number, certification agency,
standards, clearances to combustible material, as well as the main safety cautions.
5.3 Clearances to combustible material
5.3.1 Clearances to combustibles materials
The clearances shown in this section have been determined by safety tests under normal
and even abnormal operating conditions according to procedures set out in standards CSA
B366.1 (Canada) and UL 391 (U.S.A.). Respecting the minimum clearances is mandatory
to prevent risk of fire.

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MINIMUM CLEARANCES
12
A 14"(356mm)
B 18"(457mm)
C 5"(127mm)
D 1"(25mm)
E 72" (1828 mm)
F 11"(279 mm)
G 24"(610 mm)
REQUIRED MEASURMENTS
X
3
24"(610mm)
5.3.2 Cold air return ductwork Clearances
The air return duct can be connected to a
new or to an existing air return ductwork. In
both cases, the minimum clearance to
combustible material is 0" (0 mm).
1
Clearances applicable for Canada and United States.
2
Clearances applicable for single or double wall pipe.
3
Required for maintenance or replacement of components. However a 30"(762 mm) clearance is
suggested.

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5.3.3 Clearances to combustibles materials for hot air distribution duct
The hot air distribution duct can be passed through a wall with a clearance of 1"(25mm)
around it.
The clearance of the hot air distribution duct with combustibles material is 1"(25mm).
5.4 Floor protection
If the floor is made of non combustible
material, no floor protector is required.
If the floor is made of combustible
material, a floor protector is required
(see table below).
FLOOR PROTECTION*
CANADA USA
A 18" (457 mm)
From door opening
16" (406 mm)
From door opening
B N/A (USA only) 8" (203 mm)
From door opening
C 8" (203 mm) N/A (Canada only)
D 8" (203 mm) – Note 1 N/A (Canada only)
E N/A (USA only) Note 2
*Steel with a minimum thickness of 0.015" (0.38 mm) or ceramic tiles sealed together with grout.
No protection is required if the unit is installed on a non-combustible floor (ex: concrete).
Note 1: The floor protection at the back of the furnace is limited to the furnace’s required clearance
(D) if such clearance is smaller than 8"(203 mm).
Note 2: Only required under the horizontal section of the connector. Must exceed each side of the
connector pipe by at least 2"(51 mm).

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6 The exhaust system
WARNING
DO NOT INSTALL A MANUAL DAMPER IN THE EXHAUST PIPE ON THIS FURNACE.
CAUTION
BEFORE CONNECTING THE FURNACE TO THE EXHAUST SYSTEM, SURE THAT
THE EXHAUST PIPE AND/OR THE EXCHANGERS OF THE FURNACE ARE FREE OF
ALL ITEMS.
6.1 The chimney
The furnace must be connected to a factory-built metal chimney that complies with UL 103
HT (USA) or ULC S629 (Canada).
•Recommended inner diameter: 6" (152 mm).
•A chimney having a diameter of at most 7" (178 mm) is permitted, if it allows the proper
venting of combustion gases and that such application is verified and authorized by a
qualified installer. Otherwise, the diameter of the flue must be reduced to 6" (152 mm)
by the use of a stainless steel liner.
6.1.1 Factory-built metal chimneys
•To be suitable, a factory-built metal chimney also
called “high temp” chimney, must comply with UL
103 HT (U.S.A.) or ULC S629 (Canada).
•Use only components intended for the brand and
model of chimney you are using.
•Never substitute parts from other chimney
brands.
•Never fabricate your own components.
•The chimney must be a type suitable for solid
fuel.
•To be safe and effective, the chimney must be
installed exactly in accordance with the chimney
manufacturer’s instructions.

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Recommended installation
Inside chimneys are recommended
because even when no fire is burning, there
is normally an upward flow in the system.
Not recommended installation
An outside chimney will create problems
because it creates a cold backdraft, if the
furnace is installed in the lower part of the
house.
6.1.2 Masonry chimneys
The furnace may also be connected to a masonry chimney, provided the chimney
complies with the construction rules found in the building code enforced locally.
•The chimney must have a clay liner.
•If the masonry chimney has a
square or rectangular liner that is
larger in cross sectional area than a
round 6" (152 mm) flue, it should be
relined with a listed 6" (152 mm)
stainless steel liner.
•When passing through a
combustible wall, the use of wall
thimble is required.
•If a stainless steel jacket (liner) is to
be installed, it must extend 12"
(305 mm) to 18" (457 mm) above
the top of the masonry chimney to
improve draught.
6.1.3 Minimum chimney height
The top of the chimney should be tall enough to be above the air turbulence caused when
wind blows against the house and its roof.
•The chimney must extend at least 3 ft. (1 m) above the highest point of contact with the
roof.
•Extend at least 2 ft. (61 cm) higher than any roof line or obstacle within a horizontal
distance of 10 ft. (3 m).

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6.2 The exhaust pipe / Flue collar
The recommended exhaust pipe inner diameter is 6" (152 mm). If an increaser / reducer
must be used (max 6" (152 mm) to 7" (178 mm)), it must be installed as close as possible
to the chimney.
6.2.1 Installation code requirements
•Where passage through a wall or partition of combustible construction is desired, the
installation shall conform to CAN/CSA-B365, « Installation Code for Solid-Fuel-Burning
Appliances and Equipment »and NFPA 90B « Standard for the installation of warm air
heating and air- conditioning systems ».
•A flue pipe must never pass through a combustible floor or ceiling or through an attic,
roof space, closet or concealed space.
•A minimum upward slope of 1/4 in per ft. (20 mm/m) must be respected on the
horizontal length towards the chimney
•The maximum horizontal run is 10’ (3 m). Do not count the starting elbow;
•All flue pipe joints must be secured with three screws. Failure to secure them to each
other may cause a fire;
Proper installation Improper installation
CAUSES
RESTRICTION

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•Maximum unsupported horizontal length: 3 feet (1 m);
•Galvanized flue pipes must not be used because the coating vaporize at high
temperatures and release dangerous gases;
•Flue pipes must be at least 24 gauge in thickness;
•The chimney connector must be in good condition;
•Flue pipe joints should overlap 1 1/4". (30 mm);
•It should not be necessary to move the furnace to maintain the exhaust system.
•The male ends of the pipe sections must be oriented towards the appliance so that
falling dust and condensation stay inside the pipe;
•The use of 45° elbows is strongly recommended;
•Never use more than two 90° elbows.
Use 45° elbows where possible,
rather than
90° elbows.
Alternative installations with 90° elbow or tee.

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7 Hot air distribution and air return system
The Drolet furnace is designed and equipped with a hot air distribution plenum who can
receive 6 to 10, 6" (152 mm) diameter round ducts.
WARNING
THE INSTALLER IS RESPONSIBLE OF THE PERFORMANCE OF THE HOT AIR
DISTRIBUTION DUCTS AND THE AIR RETURN SYSTEM. IT WILL HAVE A DIRECT
EFFECT ON THE ABILITY OF THE BLOWER TO DISTRIBUTE HEAT EFFICIENTLY
THROUGHOUT THE HOUSE. THE NUMBER, SIZE AND LENGTH OF THE HOT AIR
DISTRIBUTION DUCTS AND AIR RETURN DUCT WILL VARY DEPENDING ON THE
CONFIGURATION AND CHARACTERISTICS OF EACH HOUSE.
WARNING
THE FURNACE AIR JACKET IS NOT TOTALLY AIR TIGHT. IT IS NORMAL TO
DETECT SOME AIR LEAKS AT THE JACKET’S JOINTS.
7.1 Hot air distribution plenum height according to ceiling height
ATTENTION
REMEMBER TO TAKE INTO ACCOUNT THE 5" (127 MM) CLEARANCE TO
COMBUSTIBLES MATERIALS ABOVE THE PLENUM.
7.1.1 Plenum’s minimum height (Plenum B only)
For a minimum ceiling height of 72"(183 cm)

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7.1.2 Adjustable height of the plenum; (with the plenum extension cut off A).
When the ceiling height, measured from
the floor is greater than 72" (183 cm),
but less than 84" (213 cm), it will be
possible to cut the plenum extension (A)
of at most 10"(254 mm). The plenum
extension (A) must therefore have a
minimum height of 14"(356 mm)
Warning: The plenum extension (A)
should not obstruct the openings for the
hot air distribution of the plenum (B).
The shaded area represents the
maximum cutting of plenum extension
(A).
7.1.3 Adjustable height of the plenum (A and B)
For ceiling height greater than 84"
(213 cm), use plenum extension (A)
without cut off and plenum (B).

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7.2 Assembling the plenum extension (A) and the hot air distribution
plenum (B).
7.2.1 Assembling the plenum extension (A)
Step 1 : Assemble the plenum extension panels (A) with 12 black screws (C) #10 x 5/8"
robertson type A provided in the user manual.
Step 2 : Install the corners reinforcements (E) (4X) provided in the plenum and plenum
extension box