A beginner's guide to indoor air quality

This short guide is aimed at professionals with responsibility for the facilities management of small and medium workplaces (for example offices, hotels or leisure facilities) as well as schools and colleges. It offers suggestions for improving air quality for employees and visitors. And as so many employees are now working from home, we also provide some easy tips you can share for optimising indoor air quality at home.

Published: March 2021
Pages: 24
BESA Product Code: H&WB001

...and why it is a national health crisis
A beginner's guide
to indoor air quality
Guide les.mitsubishielectric.co.uk
While I learned much about the exposure and the
impact of traffic and other external sources of pollution
during the campaign, I have always been aware, due to
Ella's chronic condition, that indoor air quality (IAQ) is
an equally serious issue - with many contributory factors.
Through my work with BESA, I am also learning.
We must recognise that this is something each of us
as individuals can control using low-cost technologies
and by changing our behaviours.
This guide is an invaluable non-technical introduction
to the issue of IAQ and explains how we can make
our own indoor environments safer and healthier
for us and our children. We must always remember
breathing clean air is our fundamental right.”
“‘After a hard fought seven-year campaign, my daughter Ella is now the first
person in the world to have her death directly linked to air pollution.
The second inquest into her death in 2013 from a severe and rare form of asthma has set a legal precedent that
should lead to proper enforcement of air quality guidelines and highlight the fact that air pollution is killing millions
of people worldwide every day. Through Ella's short life, children now have proper recognition of their suffering and
those in power in our societies now have a legal (and moral) obligation to act and clean up the air.
We breathe a lot and among all those breaths are
some very nasty particles and gases. Pollution may
be the invisible health threat, but that doesn't mean
it isn't real - and now millions of people are wearing
face coverings! Why? Because they are now more
aware of airborne health threats.
The invisible threat made visible.
This guide will explain why the air you breathe
inside buildings is often many times worse than
the polluted air outside, but also how much more
control we have over our indoor air quality (IAQ)
and how we can turn our homes, offices and
leisure places into ‘safe havens’ from polluted and
contaminated air. Thank you to the whole BESA
Health & Wellbeing in Buildings Committee who
contributed to this Guide, and especially our IAQ
group Shaun Hill, Fiona Li and Craig Booth for
their amazing input.”
“We spend a lot of time thinking about what we eat and what we drink, but very
little on the quality of what we breathe - despite our air intake being many times
greater than the amount of food and drink we consume.
The average adult, when resting, inhales and exhales about 13kg of air per day. We eat around 2kg of food and drink
and about 3kg of fluids each day - yet health advice on eating and drinking is all around us.
Air pollution is one of the biggest health problems
we face today. Figures from Public Health England
show that in the UK, pollution causes between
According to the Government, air pollution is the fourth
biggest killer after cancer, obesity and heart disease.
The Government estimates2 the cost of
health impacts from air pollution is
likely to exceed between
24,000 and 36,000
deaths every year.
£8 billion and
£20 billion.
The air you breathe affects every
part of your body, from your lungs
to your heart and brain.
What’s more, the air in our homes,
offices, schools and factories is
also contaminated - with polluted
outdoor air as well as other
impurities generated indoors.
The World Health Organisation (WHO) identifies a
number of serious long-term illnesses associated
with poor air quality, including lung conditions
from asthma to cancer; heart disease; Alzheimer’s
disease; and inflammatory conditions.
The UK government highlights that poor air2 quality
is particularly damaging to children who can face a
lifetime of health issues as a result of long-term
exposure to pollution.
Mitsubishi Electric is working with the Building
Engineering Services Association (BESA) and
Global Action Plan to raise awareness of the dangers
of air pollution. We are calling on government to
establish policies, raise and enforce standards
on outdoor air quality.
We are also asking businesses to play their part in
ensuring good air quality inside their buildings whilst
also supporting the British Lung Foundation as part
of their Living Well Alliance which is calling on the UK
government to improve air quality laws across the UK.
This short guide is aimed at professionals with
responsibility for the facilities management of small
and medium workplaces (for example offices, hotels
or leisure facilities) as well as schools and colleges.
It offers suggestions for improving air quality for employees
and visitors. And as so many employees are now
working from home, we also provide some easy tips
you can share for optimising indoor air quality at home.
You will also find links to more information and
organisations that can offer further advice.
Graeme Fox CEng FInstR, Head of Technical, BESA
The World Health Organisation points out that even
though the impacts of pollution are more obvious
than ever, the dangers are growing year-on-year.
The WHO identifies a wide range of pollutants
that have an impact on a global scale
and continues to research their
threat to human health.
Description: A combination of solids and liquids present in the air. Includes carbon, sulphates,
nitrates and water. The smaller particles are the most potentially damaging to our bodies as they
are the easiest to inhale.
Source: Diesel and petrol engines; friction from car brakes; dust from roads and construction works.
It is also produced by wood-burning fires which the UK government reports is now the biggest
single source of PM.
Impact on health & wellbeing: Particulate matter can cause irritation to the nose and throat.
For people with asthma and other lung conditions, it can lead to hospital admissions. PM also
has an adverse effect on people with heart conditions and stroke sufferers. It has also been
linked to anxiety and hypertension.
1. Particulate Matter PM
2. Nitrogen Dioxide
3. Sulphur Dioxide
4. Ozone
Description: A gas.
Source: Diesel and petrol engines are the main sources of NO2 as a pollutant.
Impact on health & wellbeing: Harmful to the lining of the lungs,
and can reduce immunity to other illnesses such as bronchitis.
Description: A gas.
Source: Burning fossil fuels, for example in coal-fuelled power stations.
Impact on health & wellbeing: Exposure to sulphur dioxide impacts those with lung conditions
such as asthma and COPD most, but it can cause anyone to become more prone to chest infections.
Description: A gas.
Source: Formed by a combination of other pollutants in the air. Detected more often in hot weather.
Impact on health & wellbeing: Causes inflammation of the respiratory tract, nose and throat.
The four listed here are regarded as particularly dangerous:
Unfortunately, being indoors at home or work doesn’t
protect you from polluted air. In the UK, we spend a
large proportion of our time indoors -
the most common estimate is
around 90% of our day.
So indoor air quality (IAQ)
has a significant impact on
our wellbeing.
Description: Solids and liquids present in the air in the form of particles
of various sizes.
Source: Produced indoors by activities such as cooking and cleaning; exhalation;
shedding of dust from people and processes; from fixtures and fittings such as
carpets and furniture.
Impact on health & wellbeing: Particulate matter can cause irritation to the nose
and throat. For people with asthma and other lung conditions, it can lead to hospital
admissions. PM also has an adverse effect on people with heart conditions and stroke
sufferers. It has also been linked to anxiety and hypertension.
Description: Gas.
Source: Combustion, especially gas appliances in the home (cookers; gas boilers).
Impact on health & wellbeing: Lethal at high levels. At lower levels causes
headaches, dizziness, nausea.
There are a number of pollutants that are found
indoors that can have a negative impact on our health:
1. Particulate Matter
2. Carbon Monoxide
IAQ is partly dependent on the quality of outdoor air. Pollutants will enter a building through
windows, doors and gaps in the structure. Outdoor air is also drawn into buildings by mechanical
ventilation systems such as ventilation or air conditioning, which include filters to remove many
outdoor pollutants, in order to refresh indoor air and to dilute pollutants inside the building.
But there are also pollutants created and present inside buildings. They
mix with outdoor air, creating a potent cocktail of substances which we are
all breathing every day.
PM10 & PM2.5
Description: Gas.
Source: Naturally present in the air and caused by respiration; can build up in poorly-ventilated spaces.
Impact on health & wellbeing: Leads to asphyxiation at extremely high levels. At low levels reduces
concentration, causes drowsiness, headaches.
Description: Include a range of chemicals found in the air indoors.
Source: Cleaning products; aerosol sprays; paints, carpets, scented candles; glues, resins,
cigarettes, printers, photocopiers.
Impact on health & wellbeing: VOCs are thought to be responsible for a range of health problems
from headaches and eye irritation to serious long-term illness such as cancer.
3. Carbon Dioxide
4. Volatile Organic Compounds
Description: Gas.
Source: Produced from naturally-occurring uranium (especially in granite bedrock areas).
Seeps into buildings from the ground.
Impact on health & wellbeing: The Health & Safety Executive (HSE) highlights that radon is
the second largest cause of lung cancer in the UK after smoking.
5. Radon
Description: Mould spores transferred by air currents.
Source: Mould caused by damp conditions and poor ventilation; accumulation of dirt.
Impact on health & wellbeing: Impact lung health; causes allergic reactions and asthma attacks.
6. Mould
Description: Moisture in the air (condensation) or damp penetrating walls / floors.
Source: Often a result of poor heating and ventilation; also from activities such as drying clothes in unventilated spaces.
Impact on health & wellbeing: Exacerbates the presence of mould; can cause respiratory problems and infections.
7. Excess Humidity
(WHO Air quality guidelines for particulate matter, ozone, nitrogen dioxide and sulfur dioxide, Global Update 2005 Summary of risk assessment)
Particulate Annual average limit 24-hour average limit
PM10 (coarse) 40 μg/m3
(40 micrograms per meter cubed of air)
A 24-hour average of
50 μg/m3 more than
35 times in a single year.
PM2.5 (fine) 25 μg/m3
(25 micrograms per meter cubed of air)
No 24-hour average limit
(Air Quality Standards Regulations 2010)
However, the World Health Organisation guidelines differ from these figures:
Particulate Annual average limit 24-hour average limit
PM10 (coarse) 20 μg/m3 50 μg/m3
PM2.5 (fine) 10 μg/m3 25 μg/m3
Particulate matter is a serious
problem both outside and indoors.
It is recognised by the WHO as one of
the air pollutants that is most damaging
to health because it can penetrate via
the lungs deep into the bloodstream
and organs. Particulates are categorised
by size, which influences how
they impact the human body.
PM10 refers to particles that are less than 10 micrometres
(also called ‘microns’) in diameter. This measure is
shown by the symbol μm and is equal to 0.001mm.
This size of particle is known as ‘coarse PM’.
For comparison, a human hair is generally around 50 to
70 microns thick.
The smaller the particles of PM, the more harmful they
are to humans because they are more easily transferred
through our airways into other parts of the body. The
size of fine particulate matter is PM2.5 or below -
increasing attention is now being focused on PM1 .
This is particulate matter smaller than 1 micron. PM1
is particularly harmful and includes some types of dust,
bacteria and viruses. It can enter the bloodstream and
cause damage to the body, even contributing to heart
attacks, lung cancer and dementia.
In the UK, the Air Quality Standards Regulations
(2010) set limits on exposure to particulate matter.
The regulations state that concentrations of PM in
the UK must not exceed the levels shown in the table:
While poor air quality has negative
effects on health, the opposite is
also true. Improving air quality
could benefit national health
outcomes, reduce pressure
on the NHS and prevent
premature deaths.
Research by the UK Health Forum and Imperial
College London (for Public Health England) estimated
that a 1 μg/m3 reduction in fine PM could prevent around
50,900 cases of coronary heart disease,
16,500 strokes, 9,300 cases of asthma
and 4200 lung cancers over 18 years.
Good air quality has been shown to improve a range of mental and physical health factors. For example, joint research
by Global Action Plan, the Philips Foundation and the University of Manchester shows that reducing air pollution
improves children’s ability to learn.
Their research showed that cutting air pollution levels (particularly PM2.5
and NO2) near schools by 20% could improve a child’s working memory by
6% - the equivalent of four weeks extra learning time each year.
The UK 2020 Environment Bill includes legislation on outdoor air quality, and requires government to introduce a
legally-binding target for particulate matter by October 2022. This would also change current targets on PM and other
pollutants, including long-term targets for air quality (up to 2037). The Environment Bill will also give local government
more powers and encourage cooperation with a range of organisations that can help to tackle local air pollution.
The Bill also gives government the power to enforce environmental standards for vehicles and to prohibit the sale of
polluting wood burners. However, there is less regulation for indoor air quality and no single Government department
has responsibility for setting guidelines or legislation. While there are legal standards for levels of ventilation in
homes and other buildings, limits on particulate matter or VOCs are not currently set by law. Some organisations,
such as the Building Engineering Services Association (BESA), are campaigning for government to set legal
standards for IAQ - and to make air quality monitoring and measuring mandatory.
But until legislation is in place, it is possible for homeowners and building facilities teams
to improve indoor air quality with some simple steps.
Given the hazards in outdoor air, it’s important to
regard our homes and workplaces as potential safe
havens - areas that can achieve higher levels of
indoor air quality with the right approach.
The UK Green Building Council report
‘Health, Wellbeing & Productivity in Offices’
also highlights the benefits of good IAQ.
The report points out that IAQ
is improved through ventilation,
but that it is also important to reduce
indoor air pollutants at source.
There is a range of legislation in place that covers different workplaces such as
factories and also in schools. Building Regulations for non-domestic properties
prioritise the circulation of clean air. But there is also a great deal of guidance available
from industry bodies (see our further information section).
The Building Engineering Services Association (BESA) has published a number of technical bulletins with advice on
indoor air quality, filtration and ventilation.
In the workplace, building owners and managers can reduce sources of pollution, take actions to mitigate
pollution and monitor the effectiveness of these steps:
In areas with high levels of outdoor pollution, filtering the incoming air is vital. But this means that ventilation and air
conditioning (HVAC) equipment must be powerful enough to accommodate this approach.
In the absence of sophisticated HVAC equipment, some building users may be able to open windows and make
a judgement as to whether the costs in terms of energy use, noise and possible discomfort are worthwhile. Simple
strategies like airing a building outside of peak pollution times of day such as rush-hour can form part of a
rational response.
Ensure good standards of ventilation
It is important to strike a balance between the benefits of ventilation against issues such as:
The energy required to heat (and/or cool/humidify/de-humidify) the outdoor air before it enters the building
Causing discomfort to occupants with air that is too cold or too warm
The risk of introducing more pollution into the building
The possible increase of noise in the building caused by additional mechanical ventilation or through open windows.
Reduce sources of pollution
Apply a ‘green’ buying policy to the use of paints, finishes, furniture and cleaning products. These sorts of materials
are increasingly tested and certified for their pollutant capability. Separate potential polluters such as printers and
combustion equipment from regularly occupied areas of the building where possible. Keep room surfaces and hidden
surfaces in air ducts in HVAC equipment clean (see the BESA publication TR19 for best practice guidance on
ductwork cleaning).
Click to view
Monitor indoor air quality
There are many competing monitoring and certification
schemes for buildings, relating to IAQ and other
health and wellbeing aspects.
They tend to be most used by developers of high-value
buildings to produce a valuable credential.
However, some of these schemes are extremely
stringent and assume access to high cost specialists,
state-of-the art instruments and sophisticated
laboratory analysis techniques.
There are cheaper indoor air quality monitors on the
market, but these are not entirely reliable as they tend
to drift away from any calibration quite quickly. What’s
more, interpretation of results and recommended
actions should be carried out by experts.
A middle way is emerging whereby certified,
professional-grade calibrated instruments are
coming on to the market and the knowledge and
experience to interpret the results are becoming
more widespread.
Review and implement continuous improvement
Indoor air quality can vary, even on an hourly and daily basis. Continuous monitoring is recommended with regular
recalibration and updating of policies. Regular cleaning of ductwork and filters should also be considered a key part
of air quality improvement.
In general, maintenance should be prioritised and indoor air quality made one of its key objectives. These IAQ-related
activities can be readily incorporated into the building facilities maintenance process, particularly where using a
benchmark system such as SFG20, for example.
Technologies to support air quality
Mechanical ventilation with heat recovery (MVHR) -
MVHR systems can reduce energy consumption while
maintaining the required ventilation to remove internally
generated heat, moisture and pollutants.
They are key to maintaining good indoor air quality and
as such should be equipped with the highest appropriate
quality of filtration and installed so that they can be
easily maintained and kept clean. It is possible to carry
out an outside air quality assessment near the building
to determine the level of filtration required.
Filters - these can play a crucial role in removing many
major pollutants from air as it enters a building via
ventilation and air conditioning systems. There are
recognised standards in place for application of
filters, as well as ratings for low energy filters.
The global technical standard ISO 16890:2016
includes three efficiency classes for filters:
ePM1 (best-performing); ePM2.5 (intermediate);
and ePM10, the lowest efficiency ('e' stands for
filtration efficiency).
PM1 sized particles are small enough to be inhaled
deep into the lungs and can enter the bloodstream.
The use of ePM1 class filters is highly recommended
in buildings that are close to roads and in city centres.
Most standard mechanical ventilation with heat recovery
(MVHR) system filters are designed to protect the unit
itself, rather than to improve indoor air quality. BESA
recommends checking if your MVHR system can accept
high-grade filters such as those mentioned above.
Many employees moved to working from home
during 2020, and numerous employers are
planning on offering staff the option to
continue that practice, or to come into
the office less frequently.
As a result, many people are spending
even more time in their homes, so it’s
useful to consider air quality in
that environment.
92% of our time is spent
Up to
1. Reduce sources of pollution
Even though they’re very popular, scented candles produce particulate matter that can affect people with asthma and
allergies. Wood-burning stoves are also major sources of particulate matter5. Use them with caution. The same applies
to cleaning products around the home. Use them with windows open, or consider switching to brands that contain
fewer toxins. Dusting and sweeping can also increase the presence of irritants that affect lungs and skin, so try to
carry out these tasks with the windows open.
2. Cut down on damp
If your bathroom has an extractor fan, make sure that this is turned on when you have a bath or shower. Some people
turn these off because the fan is noisy, but it’s better for IAQ to reduce damp as it can not only cause damage to
your home, it also encourages development of mould. In older homes, it may be a good idea to check on your wall
and loft insulation as well as water tightness, as this can help to reduce damp by keeping your home warmer.
There are government grants available if your property is eligible (see further information section).
3. Keep your gas appliances serviced
Carbon monoxide is extremely dangerous, so it is important to make sure that gas cookers and gas boilers are regularly
checked. It’s also a good idea to have a carbon monoxide monitor in your home. These are readily available and inexpensive.
Building Regulations require ventilation
systems for modern homes. This means
that air must be able to circulate around
the house, and in areas such as kitchens
and bathrooms must include extractor fans.
A sensible approach to good indoor air quality at home
is to use the technology that is already installed. For
example, many bathrooms include extractor fans. Use
these whenever you have a bath or shower to remove
condensation from the air. If left to build up, it can
cause damp which leads to mould.
Some kitchens are fitted with extraction hoods that
can extract pollutants produced during cooking. It’s a
good idea to operate these whenever you’re cooking, as
activities such as frying produce particulate matter. Other
kitchen hoods recirculate the air rather than removing it,
making them less effective for dealing with PM, so it is
a good idea to check which type you have.
It is possible to fit mechanical ventilation with heat recovery
(MVHR) systems in homes. These systems simultaneously
extract from the most pollutant generating rooms
(bathrooms, kitchens, utility rooms, toilets) and supply
to habitable rooms (living rooms and bedrooms). The
layout of the extract and supply points are carefully
planned out to stop pollutants spreading through the
home by displacing them with the clean fresh supply air.
MVHR systems can be centralised and connected
via ductwork to rooms. They are designed to run at a
continuous ‘trickle’ rate to ensure the constant renewal
of air in the home while also recovering heat. They can
also be wall mounted individually in specific rooms.
But there are some other important steps householders
can take to reduce indoor air pollutants:
The evidence is clear that pollution causes
premature deaths and long-term serious illnesses.
International and national organisations agree
that improving air quality will save lives,
reduce pressure on the NHS and contribute
to overall national wellbeing.
Mitsubishi Electric is working with the Building
Engineering Services Association and Global
Action Plan to push this agenda forward.
We are working to educate people
and organisations about the importance
of air quality - and lobbying government
to create clear and binding regulations
on indoor air quality as well as
outdoor pollution.
What can you do?
If you would like to learn more about providing and maintaining good indoor air quality in your building, school or
college there is more information on the BESA website: thebesa.com
Are you a school?
The Clean Air for Schools Framework is a free online tool to help every school develop a tailored clean air plan to
tackle pollution in and around the school.
It was developed in partnership with 20 schools in Manchester and combines education, abatement and advocacy for
children, teachers and the community. To find out more and download the toolkit use the link below.
Are you a business?
Mitsubishi Electric is a member of the Business Clean Air Taskforce. The ‘B-CAT’ is a cross sector coalition of businesses
convened by Global Action Plan and the Government’s Department for Environment, Food and Rural Affairs (DEFRA).
The B-CAT mission is to help accelerate the transition to a society with clean and healthy air, in a way that ensures the
public realises the benefit and avoids any risks of the transition.
As a member of the B-CAT and signatory to its Business for Clean Air initiative, Mitsubishi Electric encourages all
businesses to develop a clean air action plan to tackle air pollution.
The Business for Clean Air initiative is free and provides companies with a toolkit to create their own clean air action
plan, plus a network to learn from other businesses on everything from electric fleets to active travel for employees
to clean air workplaces. Visit: businessforcleanair.org to find out more and become a signatory.
Twenty One
Download the toolkit
Mitsubishi Electric
Mitsubishi Electric has 100 years of experience in providing reliable, high-quality products and support
to installers, specifiers, corporate clients and domestic customers around the world. Its mission is to
provide innovative products that support sustainable, healthy living and working. Mitsubishi Electric’s
Vision 2021 focuses on reducing energy use in buildings and educating the next generation about
renewable technologies and energy conservation. Mitsubishi Electric is working with organisations
such as BESA, Global Action Plan and the British Lung Foundation in order to make these goals a reality.
The Building Engineering Services Association (BESA)
The Building Engineering Services Association (BESA) was established over 115 years ago. Its members install and maintain
heating, ventilating and air conditioning systems in homes and other buildings. BESA has set high standards of competence and
quality for members, and supports them with technical guidance, training and advice. BESA regards indoor air quality as key
to occupant health, and has called for buildings to be ‘safe havens’ from outdoor pollution.
Global Action Plan
Global Action Plan is a charity that helps people live more sustainable lives by connecting what is good for us and good for the
planet. We're the people behind Clean Air Day, the UK's largest air pollution campaign. We work with people on bringing about
compassion not consumerism and increasing wellbeing - what's good for us is often greener too. And we bring business and
young people together to work on a sustainable future - helping young people develop the skills and knowledge to tackle
environmental issues is good for the planet and for everyone's future too.
The British Lung Foundation
Mitsubishi Electric is a patron of the British Lung Foundation’s Living Well Alliance which brings together companies who offer treatments,
devices or products that support people to manage their lung conditions. Mitsubishi Electric has contributed financially to the
furtherance of the charitable objectives of the British Lung Foundation. The British Lung Foundation remains a fully, independent,
impartial and unbiased provider of health advice and support.
Twenty Two
1. https://www.gov.uk/government/news/public-health-england-pub lishes-air-pollution-evidence-review#:~:text=Air%20
2. https://www.gov.uk/government/publications/health-matters-air-pollution/health-matters-air-pollution#:~:text=Poor%20air
3 . https://www.gov.uk/government/publications/health-matters-air-pollution/health-matters-air-pollution
4. https://www.ukgbc.org/sites/default/files/Health%2520Wellbeing%2520and%2520Productivity%2520in%2520Offices%2520-%2520The
5. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/770715 /clean-air-strategy-2019.pdf
IAQ: Indoor Air Quality
PPM: Parts per million - a measure used to indicate the level of a pollutant in the air.
Particulate matter: Solid and liquid matter in the air (indoors and outside) that may be very small but have a potentially damaging effect on the human body.
Humidity: The amount of water vapour present in the air (indoors or outside).
HVAC: Heating, ventilation and air conditioning in a building.
Ventilation: Replaces stale indoor air with outdoor air.
Air conditioning: Modifies the humidity and temperature of air inside a building to create a comfortable environment.
Glossary of terms
BESA Standards on air filtration and air quality standards
BESA: SFG 001 Air filter selection to provide clean healthy indoor air quality for city buildings.
BESA: SFG 003 Air filtration and HVAC systems. Life Cycle Costing and energy efficiency.
BESA: SFG 004 Clean indoor air, for heath, wellbeing and productivity.
BESA: SFG20 The Definitive Standard for Planned Maintenance.
BESA: TR 19® Guide to good Practice - Internal cleanliness of ventilation systems.
Technical Standards
BS EN15780 Ventilation for buildings. Ductwork. Cleanliness of ventilation systems.
BS EN 16798-3:2017 Ventilation for buildings. For non-residential buildings. Performance requirements for ventilation and room-conditioning systems.
Green Building Standards
BRE: BREEAM / Fitwel: The Fitwel standard / IWBI: The WELL building standard v2 / RESET: The RESET standard / USGBC: LEED v4.1.
Guidelines from other regulating bodies
CIBSE TM40 (2020): Health & wellbeing in building services.
REHVA Guide no.9: Indoor climate and productivity in offices.
WHO: Guidelines for indoor air quality.
HSE: Workplace (health, safety & welfare) Regulations.
Further reading and useful documents
Twenty Three
UNITED KINGDOM Mitsubishi Electric Europe Living Environmental Systems Division
Travellers Lane, Hatfield, Hertfordshire, AL10 8XB, England. Telephone: 01707 282880 Fax: 01707 278881
IRELAND Mitsubishi Electric Europe
Westgate Business Park, Ballymount, Dublin 24, Ireland. Telephone: (01) 419 8800 Fax: (01) 419 8890 International code: (003531)
Effective as of February 2021
Mitsubishi Electric Living
Environmental Systems UK
Mitsubishi Electric mitsubishielectric2 thehub.mitsubishielectric.co.uk
Cooling and Heating UK
Telephone: 01707 282880
email: air.conditioning@meuk.mee.com
website: airconditioning.mitsubishielectric.co.uk
website: recycling.mitsubishielectric.co.uk
Country of origin: United Kingdom - Japan - Thailand - Malaysia. ©Mitsubishi Electric Europe 2021. Mitsubishi and Mitsubishi Electric are trademarks of Mitsubishi Electric Europe B.V.
The company reserves the right to make any variation in technical specification to the equipment described, or to withdraw or replace products without prior notification or public announcement.
Mitsubishi Electric is constantly developing and improving its products. All descriptions, illustrations, drawings and specifications in this publication present only general particulars and shall
not form part of any contract. All goods are supplied subject to the Company’s General Conditions of Sale, a copy of which is available on request. Third-party product and brand names
may be trademarks or registered trademarks of their respective owners.
Note: The fuse rating is for guidance only. Please refer to the relevant databook for detailed specification. It is the responsibility of a qualified electrician/electrical engineer to select the correct
cable size and fuse rating based on current regulation and site specific conditions. Mitsubishi Electric’s air conditioning equipment and heat pump systems contain a fluorinated greenhouse
gas, R410A (GWP:2088), R32 (GWP:675), R407C (GWP:1774), R134a (GWP:1430), R513A (GWP:631), R454B (GWP:466), R1234ze (GWP:7) or R1234yf (GWP:4). *These GWP values are
based on Regulation (EU) No 517/2014 from IPCC 4th edition. In case of Regulation (EU) No.626/2011 from IPCC 3rd edition, these are as follows. R410A (GWP:1975), R32 (GWP:550),
R407C (GWP:1650) or R134a (GWP:1300).
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