Minotair BOREAL 12000 SERIES User manual

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THE MULTIFUNCTION AIR EXCHANGER
BOREAL 12000 SERIES
PLEASE READ THIS MANUAL CAREFULLY
AND KEEP IT FOR FUTURE REFERENCE

2© MINOTAIR Ventilation Inc. - www.minotair.com
(BR12K-USER GUIDE-2016-009)
Dear customer,
Congratulations for purchasing this MINOTAIR product. Much more than a simple air
exchanger, the MINOTAIR is a cutting-edge device used to control the ventilation,
temperature and humidity of your home. It does all this by filtering, dehumidifying,
heating, cooling and renewing the indoor air –thus providing a healthy and comfortable
environment all year round. Did I hear you say, “Magic Box”? This is actually how some
green building experts refer to it!
Our engineers have successfully integrated and optimized various techniques associated with
ventilation and thermodynamics to build a high performance, energy-efficient device. As a result,
the MINOTAIR offers superior recovery efficiency when compared to traditional Heat or Energy
Recovery Ventilators. Not to mention that, unlike the MINOTAIR, none of these products can heat,
cool or dehumidify by themselves. Only the MINOTAIR can claim to be truly multifunctional.
The MINOTAIR is easy to operate with its user-friendly digital control, designed to focus on
the factors directly affecting comfort and air quality. Whether it is about the ventilation
rate, temperature or humidity level –the information is always available at a quick glance.
Furthermore, you can now rest assured knowing that you will no longer be left behind when
new features become available, thanks to the MINOTAIR’s USB port. This makes it possible to
update the microcontroller when upgrades are released for download on our website. Gone
are the days when you would find out that your brand new device was quickly becoming
obsolete as subsequent features were coming to market. Your MINOTAIR will keep evolving
and benefiting you for many years. By the way, new features are offered free of charge!
Finally, please take the time to read this guide thoroughly. It was written for you and
contains both practical and important information. It will help you get the most out of
your device. Store it for future reference, preferably close to the device.
The whole team thanks you for choosing MINOTAIR.
Karl Audet
President and Lead Engineer
MINOTAIR Ventilation Inc.

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TABLE OF CONTENTS
Table of Contents............................................................................................................................................. 3
Safety Definitions ............................................................................................................................................. 6
Safety Instructions....................................................................................................................................... 6
Setting Expectations ....................................................................................................................................... 7
Device Overview............................................................................................................................................... 8
Main Components....................................................................................................................................... 9
External Overview......................................................................................................................................10
Operating Modes.......................................................................................................................................11
1. Air Exchanger Mode (Ventilation) ..........................................................................................11
2. Heat Pump Mode (Recirculation)............................................................................................12
3. Recirculation Mode without Compressor............................................................................13
4. Intermittent Mode .......................................................................................................................14
5. Smart Mode ...................................................................................................................................15
Installation Procedures.................................................................................................................................16
Important Installation Requirements..................................................................................................16
Personal Safety....................................................................................................................................... 16
Regulations .............................................................................................................................................16
Device Inspection..................................................................................................................................16
Choosing where to install the MINOTAIR ..........................................................................................16
Choosing an Installation Method.........................................................................................................17
Connection to a Forced Air Ventilation System –Simplified Method .................................17
Connection to a Forced Air Ventilation System –Extraction at the Source.......................18
Connection to an Independent System of Ventilation Ducts.................................................19
Calculating Ventilation Airflow .............................................................................................................20
Sizing Air Ducts...........................................................................................................................................21
Basic Guidelines for Air Ducts ...........................................................................................................23
Insulating Air Ducts ..............................................................................................................................24
Installing Flexible Ducts......................................................................................................................24
Validating the Ducts Installation......................................................................................................24
Location of Indoor Grilles........................................................................................................................ 25
Supply Grilles..........................................................................................................................................25
Return Grilles ..........................................................................................................................................25
Location of Outside Hoods.....................................................................................................................25
Balancing the system................................................................................................................................26

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Balancing Registers ..............................................................................................................................26
Balancing the MINOTAIR.....................................................................................................................26
Securing the MINOTAIR ...........................................................................................................................27
Connecting the Condensate Drain......................................................................................................28
Connecting to Other Central Devices (Installation Options).......................................................29
Connecting to a 3 kW Electric Coil (Installation Option)...............................................................30
Connecting to an Auxiliary Heat Pump (Installation Option) .....................................................30
Connecting to a Bathroom Timer (Installation Option) ................................................................31
Installing the Wall Mount Control (Installation Option)................................................................ 32
Selecting the Location.........................................................................................................................32
Adjusting Display Contrast ................................................................................................................32
Cable Configuration .............................................................................................................................33
Wall-Mounting .......................................................................................................................................34
Connecting the MINOTAIR .....................................................................................................................35
Digital Control Basics ....................................................................................................................................36
Main Screen .................................................................................................................................................36
Digital Control Buttons ............................................................................................................................37
Explanation of Symbols ...........................................................................................................................38
Adjusting Display Contrast.....................................................................................................................39
Boot Sequence............................................................................................................................................39
Turning the Device On and Off .............................................................................................................40
Adjusting Indoor Temperature .............................................................................................................41
Adjusting Indoor Relative Humidity....................................................................................................42
Switching Between Ventilation Speeds .............................................................................................42
Main Menu........................................................................................................................................................43
1. Ventilation Settings .........................................................................................................................43
“Ventilation” settings screen .............................................................................................................43
“Ventilation” settings screen (cont’d).............................................................................................45
“Ventilation” settings screen (cont’d).............................................................................................45
“Ventilation” settings screen (cont’d).............................................................................................46
“Ventilation” settings screen (cont’d).............................................................................................46
“Ventilation” settings screen (cont’d).............................................................................................47
“Ventilation” settings screen (cont’d).............................................................................................47
2. Adjusting Heating and Cooling Settings ..................................................................................48
“Temperature” settings screen .........................................................................................................48

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“Temperature” settings screen (cont’d).........................................................................................49
“Temperature” settings screen (cont’d).........................................................................................50
“Temperature” settings screen (cont’d).........................................................................................50
“Temperature” settings screen (cont’d).........................................................................................51
3. Adjusting Indoor Humidity Settings ..........................................................................................52
“Humidity” settings screen ................................................................................................................52
“Humidity” settings screen (cont’d) ................................................................................................ 53
“Humidity” settings screen (cont’d) ................................................................................................ 54
4. Adjusting Program Settings..........................................................................................................55
“Program” settings screen..................................................................................................................55
“Program” settings screen (cont’d) .................................................................................................56
5. Adjusting Filter Settings.................................................................................................................57
“Filters” settings screen.......................................................................................................................57
6. Other Settings....................................................................................................................................58
“Other settings” screen .......................................................................................................................58
“Clock” screen 1 .....................................................................................................................................59
“Clock” screen 2 .....................................................................................................................................59
7. System Info .........................................................................................................................................60
“System info – Odometer” screen....................................................................................................60
“System info – Software version” screen .......................................................................................60
Alarm Descriptions.................................................................................................................................... 61
Control Card ................................................................................................................................................65
Electrical Schematic ..................................................................................................................................66
Maintenance................................................................................................................................................67
Limited Warranty .......................................................................................................................................68
Limitations and Exclusions.................................................................................................................68
Warranty Transfer..................................................................................................................................68
Damage Claims......................................................................................................................................68
Other warranty rights ..........................................................................................................................68
NOTES:...........................................................................................................................................................69

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SAFETY DEFINITIONS
WARNING: Indicates a dangerous situation that, if not prevented, could cause
serious injury or death.
CAUTION: Indicates a situation that may cause damages to the device or lead to
material damage or physical injury.
SAFETY INSTRUCTIONS
Please read these instructions carefully. Failure to follow these instructions could result in
damages to the device or other safety hazards. It is very important to understand how this
air exchanger operates and how to perform maintenance procedures safely.
WARNING: Electrical hazard.
This device operates at 120 VAC, which is enough to cause serious injury or death.
Always cut power to the device before performing maintenance or repairs.
WARNING: Heavy equipment.
Improper handling or installation of this device may cause serious injury or death. At
least two people are required to hang or take down the device. The device must be
suspended using all four installation hooks included for this purpose.
WARNING: Combustion products.
Never proceed with the installation of an extraction grille in an enclosed space
containing fuel-burning equipment that may be prone to back drafting of
combustion products such as an oil furnace, hot water gas heater, stove, fireplace,
gas dryer, etc. Combustion products can cause serious poisoning or death.
CAUTION: Risk of head injury.
Use caution when opening the main access panel while the device is hanging above
ground. Always support the panel until completely opened.
CAUTION: Risk of water damage.
This device can condense tens of liters of water every day, depending on humidity
levels in the air. The condensate drainpipe must be connected to a floor drain or a
dedicated pump. Moreover, in certain situations, there could be condensation
forming on the outside walls of the unit and the distribution ducts. In this case,
isolating the distribution ducts and adding a drain pan under the device could be
required for added protection.
CAUTION: Cutting hazard.
Although care has been taken to prevent sharp edges on various parts, always be
careful when handling the device from its edges.
CAUTION: Construction and renovations.
Before undertaking major painting or sanding projects, shut off ventilation to avoid
clogging the air ducts and filters.

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SETTING EXPECTATIONS
The following list is meant to clarify expectations following commissioning of the MINOTAIR in
accordance with the instructions set forth in this guide. Keep in mind that the MINOTAIR
should be installed and maintained in accordance with this manual to ensure optimal
performance for many years.
Ideal humidity levels. During winter, a 35% humidity level is ideal. It is, however,
possible to adjust this setting depending on personal preference or until condensation
appears on the windows. If condensation starts forming, lower your humidity
setpoint. Please note that if temperature is lowered for the night, condensation is
likely to appear on the windows in the morning. Morning condensation is normal, as
long as it goes away once temperature is brought back up to the daytime setpoint. In
summer, a 45% humidity level is very comfortable. At all time, the indoor humidity
setpoint may be hard to reach and maintain if your house is not airtight.
Humidity setpoint. It can take up to a week from the device’s initial start-up to reach
the humidity setpoint. This is normal and depends on various factors such as climate,
occupant habits, furniture, house size, insulation and airtightness. Regarding the
airtightness of the house, if the humidity setpoint cannot be reached, it is likely that
the supply of air naturally entering the home through cracks and openings exceeds
the MINOTAIR handling capacity. In this case, a point of equilibrium will form which
will tend be more humid in summer and drier in winter.
Ventilation rate. Too much ventilation will bring in an excessive amount of dry air in
winter and humid air in summer. This could make it difficult to maintain humidity
levels at the desired setpoint. On the other hand, insufficient ventilation will fail to
renew the air in the house adequately and could lead to excess humidity. Make sure to
follow the guidelines of this manual to plan and set the proper ventilation rate for your
situation.
Auxiliary heating and cooling systems.While the MINOTAIR is able to heat and cool
a house for parts of the year, it is unlikely to do so completely without the help of an
auxiliary system, especially during the cold winter months. Furthermore, several
factors can influence your heating and cooling needs. These factors include climate,
house size, insulation, airtightness, window quality and area, windows’ orientation in
relation to the sun, and, of course, occupant habits.
Device maintenance. The MINOTAIR is a sophisticated and safe air processing system.
Its proper functioning can only be ensured if the device is adequately maintained.
Filters must be changed regularly –every 3 months –and replacement filters must be
designed specifically for the MINOTAIR. Furthermore, the condensate drainpipe and
the outside air intake/outlet hoods must be inspected at least every month. Clean
them as necessary.
You are now ready to enjoy your MINOTAIR!

8© MINOTAIR Ventilation Inc. - www.minotair.com
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DEVICE OVERVIEW
The MINOTAIR is a multifunction device:
Advanced control system.
oReview the elements that affect comfort and air quality such as ventilation,
temperature and humidity easily and at a quick glance!
oIntegrates the control of central units, including heating, cooling, and humidification for
harmonized operations and maximum efficiency.
High performance air exchanger.
oFilters air while removing pollutants from the house, and oxygenates indoor air
with fresh air from outside.
oDehumidifies and cools air in summer, and dehumidifies and recovers heat in
winter.
Self-contained heat pump.
oRequires no installation of outside equipment other than the fresh air intake and
stale air exhaust hoods.
oDehumidifies and cools air in summer; heats air in winter.
Air Purifier with HEPA filtration.
oStandard antimicrobial filters remove air dust, which could otherwise damage the
device. These filters are MERV 8 (G4) rated and stop more than 90% of dust
particles as small as 3.0 µm.
oMERV 8 (G4) rated activated carbon filter reduces or eliminates odours (optional).
oMERV 14 (F8) High Efficiency filter removes up to 95% of particles as small as
0.3 µm (optional).
Powerful HumiWatch365©System.
oRemoves up to 42 liters/day (88 pints/day) of moisture from the indoor air
depending on the level of humidity contained in the air, and without overheating
air unlike conventional dehumidifiers.
oRecovers the heat and moisture of showers to humidify indoor air when it is too
dry, as required. Can also be connected to and control a central humidifier.
Figure 1 –MINOTAIR –Acts on temperature, humidity level and air renewal.

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MAIN COMPONENTS
Figure 2 –MINOTAIR assembly and components.
Insulated finished aluminum housing
with resistant baked-on powder paint.
Bidirectional expansion valve.
High efficiency compressor
1) Reversible valve.
2) Filter-dryer.
3) Muffler.
Energy recovery coil –Distribution side.
Sensor –Outside temperature.
Motorized damper housing.
Fresh air intake.
Motorized damper.
Motorized damper actuator.
Energy recovery coil –Extraction side.
Stale air outlet.
Constant airflow exhaust fan.
Sensor –Defrost temperature
MERV 8 (G4) prefilter –Exhaust side.
Sensor –Indoor humidity and temperature
Stale air intake.
Condensate pan cap.
1) MERV 8 (G4) prefilter –Supply side.
2) High efficiency MERV 14 (F8) filter
(optional).
Microcontroller with integrated digital
control.
Terminal board for central units such as a
furnace, air conditioning and humidifier.
Wall mount digital control (installation
option).
Sensor –Conditioned temperature.
Fresh air outlet.
Constant airflow supply fan.

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EXTERNAL OVERVIEW
The MINOTAIR’s housing is 100 % aluminum, which makes it lighter and easier to handle.
Furthermore, aluminum is a long-term guaranty against corrosion which, otherwise, would
end up weakening the housing structure since it is always in contact with humidity and
condensates.
The air outlets are located on top of the device for easy installation. This eliminates the
need to add elbows to redirect the airflows upward to reach the main ducts, which are
often installed in the ceiling joists.
The four installation hooks designed to suspend the device are each secured with a bolt,
which allows the hooks to be positioned at an angle. This in turn enables more flexibility
when aligning the hooks with their anchor points.
The installation hooks are also designed so as to attenuate the propagation of vibrations
from the device to the structure of the house.
The transportation feet are designed to protect the condensate drain from collapsing when
the device rests on the floor. Furthermore, these feet create a space under the device,
which makes lifting it much easier for installers.
Access to components requiring maintenance –filters for example –is possible from the
front of the device by opening the main access panel.
Figure 3 –External overview of the device.

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OPERATING MODES
The MINOTAIR is the only system of its kind to combine a motorized damper with two
constant airflow fans.The motorized damper can switch between two positions, which allow
the MINOTAIR to function as either an air exchanger (ventilation) or a heat pump
(recirculation). As a result, this allows for the development of various operating modes to
optimize energy efficiency and occupant comfort.
1. AIR EXCHANGER MODE (VENTILATION)
This mode controls two flows, one being fresh air and the other stale air. To
operate in this mode, the motorized damper makes a full clockwise rotation until it
is in contact with the angled walls. In this mode, the microcontroller sets the same
airflow for each fan.
Air Exchanger Mode features include:
oFilters air while removing pollutants from the house, and oxygenates indoor
air with fresh air from outside.
oDehumidifies and cools air in the summer.
oDehumidifies and recovers heat in the winter.
oCan also humidify when connected to a humidifier.
When to use:
oWhen it is imperative to have a continuous supply of fresh air. Note that at
certain times of the year, this mode could make humidity management
difficult; air too dry in winter and too humid in summer.
Figure 4 –Air Exchanger Mode (Ventilation).

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2. HEAT PUMP MODE (RECIRCULATION)
This mode controls two flows, one being indoor air recirculation and the other,
outside air intake. To operate in this mode, the motorized damper makes a full
counter clockwise rotation until it is in contact with the angled walls. In this mode,
the airflows set by the microcontroller are not necessarily identical for the two fans,
because the goal is to optimize the current operation (heating, cooling, and
dehumidification). Thus, the left fan will usually have a lower airflow than the right
fan, which should be close to the maximum possible airflow.
Heat Pump Mode features include:
oDehumidifies and cools air in summer and heats air in winter. Note that the
heat pump heats by acting on temperature and cools by acting more on
humidity that causes discomfort in summer.
oFilters air while providing uniform humidity and temperature conditions.
oCan also humidify when connected to a humidifier.
When to use:
oWhen comfort prevails over indoor air quality. Note that this mode does
not allow any intake of fresh air, so it should not be used continuously.
Figure 5 –Heat Pump Mode (Recirculation).

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3. RECIRCULATION MODE WITHOUT COMPRESSOR
This mode controls a single flow, which is indoor air recirculation. To operate in this
mode, the motorized damper makes a full counterclockwise rotation until it is in
contact with the angled walls. In this mode, the left fan operates at the airflow set
by the microcontroller while the right fan is practically stopped. This is because a
minimum airflow is required to measure outside air temperature.
Recirculation Mode features include:
oFilters indoor air while providing uniform humidity and temperature
conditions.
oUltra-low energy consumption.
When to use:
oWhen it is not possible or desired to have a supply of fresh air and there is
no reason to heat, cool or dehumidify. Note that this mode does not allow
any intake of fresh air, so it should not be used continuously.
Figure 6 –Recirculation Mode without Compressor.

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4. INTERMITTENT MODE
This is a mixed mode that alternates between Air Exchanger and Recirculation
modes. Four settings are possible:
Intermittent-10. Activates Air Exchanger Mode for 10 minutes before
switching to Recirculation Mode for 50 minutes, and so on.
Intermittent-20. Activates Air Exchanger Mode for 20 minutes before
switching to Recirculation Mode for 40 minutes, and so on.
Intermittent-30. Activates Air Exchanger Mode for 30 minutes before
switching to Recirculation Mode for 30 minutes, and so on.
Intermittent-40.Activates Air Exchanger Mode for 40 minutes before
switching to Recirculation Mode for 20 minutes, and so on.
It is also possible to replace Recirculation Mode with Heat Pump Mode, depending
on whether you want to heat and cool during periods in which the indoor air is not
being renewed.
Intermittent Mode features include:
oLower energy consumption.
oAll the benefits of Air Exchanger and Heat Pump Modes, depending on the
type of intermittency selected.
When to use:
oWhen it is necessary to have a well-defined and guaranteed supply of fresh air.
oIdeal during prolonged absences to ensure a minimum supply of fresh air.
oIf air becomes too dry in winter, lower the intermittency as needed.
and
Figure 7 –Intermittent Mode 10, 20, 30 or 40 –with recirculation.
and
Figure 8 –Intermittent Mode 10, 20, 30 or 40 –with heat pump recirculation.

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5. SMART MODE
This is a mixed mode in which priority is given to humidity management followed
by Air Exchanger Mode. Then, when the microcontroller detects the need to call for
heat or cold, it stops Air Exchanger Mode and switches to Heat Pump Mode.
However, if the outside air temperature is unsuitable for either mode, the
microcontroller will switch to Recirculation Mode.
Smart Mode features include:
oGreatly optimizes humidity management.
oEnsures a minimum of 10 minutes of fresh air every hour.
oPrevents additional intake of fresh air if the indoor relative humidity is too
low in winter (the 10-minutes-per-hour minimum still applies unless explicitly
prohibited by occupants).
oSwitches to heat pump mode upon calls for heat or cooling.
oSwitches to Free Cooling (no compressor) or to Turbo Cooling (free cooling
with compressor) when outside temperature permits.
oGoes into recirculation mode when climatic conditions are unsuitable for air
exchanger or heat pump modes.
When to use:
oAlways! Unless you have a specific reason to use a different mode, the Smart
mode is the ideal and recommended option.
oCombine the Smart mode with the operation of heating and cooling in
automatic mode and you will get an integrated indoor air management system
that is fully automated. In other words, once the unit is set to your preferences,
you will forget it's there.
or or
Figure 9 –Smart Mode.

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INSTALLATION PROCEDURES
IMPORTANT INSTALLATION REQUIREMENTS
PERSONAL SAFETY
Wear safety glasses when installing the MINOTAIR.
Follow professional safety standards and all local regulations.
REGULATIONS
WARNING! The MINOTAIR should be installed in accordance with the local
building codes that are in effect. In absence of such requirements, it is advisable to
check with local authorities having jurisdiction in your area.
DEVICE INSPECTION
WARNING! Do not power on the device at this point.
Inspect the exterior of the device to make sure it is not damaged.
Make sure the panel, the hinges, the damper, the vents, the fan blades, the housing
and the installation hooks are in good condition.
Any damage sustained during transport must be reported within 24 hours of
delivery.
CHOOSING WHERE TO INSTALL THE MINOTAIR
Choose an accessible location that will allow and facilitate maintenance and repairs.
Avoid lounging areas, offices and bedrooms. It is recommended to soundproof the
selected location if it is too close to rooms where quietness is desired. In this case,
use a solid core door and affix a rubber door sweep (weather strip) at its bottom to
seal the space between the bottom of the door and floor. Do not use louvered or
accordion doors as they have no soundproofing property.
The device must be installed indoor, never outside, and the location must maintain
an indoor temperature between 16°C and 27°C (60°F and 80°F).
The device must be located near a 120 VAC electrical source, which must be
dedicated to the device. No other device can use this same circuit.
The location must be close to a floor drain. If that is impossible or if there is no floor
drain in the house, you must install a condensate pump (not supplied) in order to
eliminate condensation in a water return pipe. For example, a washing machine
return pipe could be used. Condensate pumps can be found in most hardware
stores.
If the air ducts are not already installed, it is preferable to plan their course before
deciding on the unit’s final location.

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CHOOSING AN INSTALLATION METHOD
The MINOTAIR must be installed using one of the three following methods:
oConnection to a forced air ventilation system –Simplified method.
oConnection to a forced air ventilation system –Extraction at the source.
oConnection to an independent system of ventilation ducts.
CONNECTION TO A FORCED AIR VENTILATION SYSTEM –SIMPLIFIED METHOD
This is the easiest installation method, though not necessarily the preferred one. It
will provide fresh air to all rooms served by the ventilation system. Stale air and
humidity extraction is done through existing return ducts which could make
humidity management more difficult than if the extraction were at the source.
This method is only possible if the MINOTAIR can be installed in the same room
where the forced-air system ventilator is located.
It is required that the forced air ventilator runs continuously or ventilator
operations is interlocked with the “G” terminal of the MINOTAIR.
A minimum distance of 6 ft. (2 m) between return and supply connections is required.
Figure 10 –Connection to a forced air ventilation system –Simplified method.
(The two MINOTAIR center ports are swapped for more clarity in the drawing)
NOTE: Refer to the section about “Balancing the MINOTAIR”for whether to add a
register key at this location.

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CONNECTION TO A FORCED AIR VENTILATION SYSTEM –EXTRACTION AT THE SOURCE
This installation method is preferred over the “Simplified Method” described above.
If you must choose between the two, it is better to choose “Extraction at the
Source” to fully benefit from the HumiWatch365© system.
This method will provide fresh air to all rooms served by the ventilation system.
However, stale air and moisture will be extracted directly at the source through
dedicated ducts to ensure better humidity management.
This option is only possible if the MINOTAIR can be installed in the same room
where the forced-air system ventilator is located.
It is required that the forced air ventilator runs continuously or ventilator
operations is interlocked with the “G” terminal of the MINOTAIR.
Figure 11 –Connection to a forced air ventilation system –Extraction at the source.
(The two MINOTAIR center ports are swapped for more clarity in the drawing)
NOTE: Refer to the section about “Balancing the MINOTAIR“ for whether to add a
register key at this location.

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CONNECTION TO AN INDEPENDENT SYSTEM OF VENTILATION DUCTS
This type of installation is required when the house is heated through electric
baseboards or a radiant system. Since these systems do not include forced air
ventilation ductwork, it is necessary to install a dedicated system of ventilation
ducts.
Like the previous method, stale air and moisture will be extracted directly at the
source through dedicated ducts to ensure better humidity management.
Therefore, one will be able to fully benefit from the HumiWatch365©system.
For this type of installation, it is best to include a section of acoustic flexible duct
measuring 1 m (3 ft) at the end of each supply branch. This will soundproof the air
supply.
Figure 12 –Connection to an independent system of ventilation ducts.
(The two MINOTAIR center ports are swapped for more clarity in the drawing)

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CALCULATING VENTILATION AIRFLOW
The airflow rate of fresh air and stale air required throughout the house must be
calculated by adding together the airflows required for each room, as indicated in
the shaded columns below. Airflows are denoted in cubic feet per minute (cfm) or
liters per second (l/s).
The smaller a room is in comparison to the other rooms, the closer the airflow rate
must be to the “Min” value. Bigger rooms will require airflow rates closer to the
“Max” value.
For each dwelling
Recommended airflow for
each room
Air ducts diameter
for each room
cfm
l/s
in
mm
SUPPLY
Rooms requiring a fresh air supply*
Min
Max
Min
Max
Min
Max
Min
Max
Each bedroom (one person)
10
20
5
10
5
5
125
125
Each bedroom (two persons)
20
30
10
15
5
6
125
150
Home office
10
20
5
10
5
5
125
125
Main lounging room (living room)
20
40
10
20
5
6
125
150
Each floor not already serviced by air supply
10
30
5
15
5
6
125
150
Basement if not already serviced by air supply
10
30
5
15
5
6
125
150
Optional rooms to be supplied with fresh air*
Dining room
20
40
10
20
5
6
125
150
Family room
20
40
10
20
5
6
125
150
Play room
20
40
10
20
5
6
125
150
Any other furnished room
10
20
5
10
5
5
125
125
EXTRACTION
Recommended rooms for stale air extraction*
Bathroom or shower
30
80
15
40
5
6
125
150
Restroom
10
20
5
10
5
5
125
125
Kitchen
(minimum distance between the return grille and any cooking
surface must be 3m (10 ft.)).
30
80
15
40
5
6
125
150
Laundry room
10
20
5
10
5
5
125
125
Basement if already serviced by air supply
30
80
15
40
5
6
125
150
* Treat each room comprised in an open space as an individual room
Required fresh air supply
Write result
Main ducts
minimum diameter
cfm
l/s
cfm
l/s
in
mm
Total fresh air supply 1,2
Your
answer
Your
answer
≤90
≤40
6
150
1. Input this value into the microcontroller.
> 90
> 40
8
200
2. The total exhaust airflow must be identical
Table 1 –Airflow planning.