Natural Ventilation, Natural Daylight and Natural Cooling systems.

1. NaturalVentilationSolutions
natural ventilation technical submission
0844 809 2509 | airtherm.co.uk | info@airtherm.co.uk

2. Introduction to Airtherm
Airtherm Engineering Limited supply a wide
range of natural ventilation and lighting
systems that can be designed and installed to
suit virtually any application.
We provide for the commercial, educational, industrial and
private sectors and our products are increasingly popular in
schools, hospitals, offices and industrial buildings.
natural ventilation technical submission
Natural Ventilation and Lighting systems make use of nature's
own power source to provide interior spaces with a fresh air
supply or natural daylight illumination or both.
Buildings utilising natural ventilation or lighting systems, by
their very nature, experience a significant reduction in traditional
energy running costs.
The Airtherm ‘Wind-iVent’ is a natural ventilation system
operating on established aerodynamic principles. As air flows
around the terminal itself, positive and negative pressure areas
are generated. On the positive side air enters the louvres of the
terminal and is directed down through the internal vanes into the
room below. The negative pressure on the leeward side of the
terminal, induces air to leave the louvres, and stale air from the
room below rises and is expelled from the terminal. This process
is aided by stack effect, i.e. as cool air enters the windward side of
the unit it descends into the room below, and the warm stale air
rises in the ducts facing the leeward side providing a naturally
fresh environment.
Natural Ventilation| Introduction

3. Our Natural Product Range
Energy Efficient Heating, Cooling, Ventilation & Renewables
from Airtherm Engineering Ltd »
Airtherm Engineering Ltd only use products of the highest quality and experienced engineers
with excellence in their field. We aim to provide specifiers and contractors with complete
confidence in our service by managing projects closely, adhering to strict safety guidelines,
demanding the highest quality workmanship and will continue to strengthen our business by
listening to customer feedback.
natural ventilation technical submission
Health Benefits
By its very nature, the Wind-iVent (natural ventilator), Solar-iVent, (solar-ventilator) PassiveiVent (passive ventilator) Lite-iVent (combined wind & light ventilator) and our X-iVent (cross
wall ventilation) systems all offer a natural solution to health problems commonly associated
with mechanical air conditioning units. Rather than re-circulating stale air (and possibly
germs), the natural ventilation system is continually removing stale air and replacing it with a
fresh supply. The system takes air from the roof level eliminating a proportion of pollution,
including hazardous carbon monoxide from roadside traffic that is a common issue with low
level ventilation methods.
Suitable Applications
Our natural ventilation products are suitable for many applications including schools, offices
and hospitals. They are also used in private, local authority and commercial premises
including gymnasiums, colleges, universities, reception areas, store rooms, changing rooms,
libraries, meeting halls and are also suitable for specialist applications. They provide an ideal
solution for delivering a 'fresh' air supply to areas where conventional room ventilation is
difficult due to critical noise issues.
The Ideal Solution
Our natural ventilation systems offer architects and consulting engineers not only a natural
and environmentally-friendly solution but an acoustically efficient, economical and aesthetic
answer to ventilation needs.
Natural Ventilation| Product Range

4. Our Sectors
Industrial
Our flue and chimney exhaust systems are the obvious products utilised
by the industrial sector, however our line of natural ventilation and
lighting systems are proving increasingly popular solutions in industrial
buildings and factories throughout the UK.
Our kitchen canopy system sizes are suited to industrial applications as
well.
natural ventilation technical submission
Leisure
Our natural ventilation and light systems are ideally suited to the leisure
sector where a fresh air supply is essential or bright illumination of large
spaces is required.
Our flue and chimney systems are also ideal to handle any exhaust
requirements demanded by the large boilers often used in leisure centres.
Popular applications include gymnasiums, sports halls and health clubs.
Healthcare
Natural ventilation and lighting is a very popular solution in the health
care sector in hospitals, nursing homes and other institutions. Providing
fresh, breathable air and natural light for patients and health care
workers has numerous benefits to health, recovery and staff
productivity.
Similarly, our kitchen canopies offer a safe, hygienic working
environment where food can be prepared quickly and efficiently without
the worry of external contamination.
Natural Ventilation| Our Sectors

5. Our Sectors
Commercial
Our complete product range is ideally suited to applications
throughout the commercial sector. Increasingly, office buildings are
benefitting from new, greener, more efficient technologies such as
natural ventilation, natural lighting, heat pumps, solar pv and our
energy-saving air conditioning units.
Our range of exhaust products, from flues and chimneys to kitchen
extract canopies, are also suitable for commercial installation.
natural ventilation technical submission
Educational
Our product range is perfect for the educational sector. We have found
schools and colleges are often keen to utilise the latest green and eco
technology, not just to lower costs but to act as a living experiment for
pupils and parents to experience.
Our natural ventilation systems are a great solution for classrooms
and the daylight supply from our natural lighting products are ideally
suited for the daily periods of occupation.
The growing use of heat pumps and solar pv technology to generate
hot water and electricity while reducing a buildings carbon footprint
are also widely employed as part of a whole building strategy.
Our flue and chimney exhaust systems are also suited to the
buildings heating demands and kitchen canopies can be installed
where on-site cooking or food preparation facilities are used.
Retail
Our efficient, high performance kitchen canopies are ideal for
restaurants and food based retail outlets where food must be
prepared quickly, hygienically and safely. They are used throughout
the industry by outlets ranging from the small to large.
Our air conditioning units are, traditionally, widely used throughout
the retail sector. Our growing range of greener, more efficient and Arated energy products are a stylish complement to any shop or as a
replacement for older, less efficient models.
Natural Ventilation| Our Sectors

6. Wind-iVent - Natural Ventilation Systems
Our natural ventilation solutions consist of two synchronizing devices: a roof-mounted natural
ventilation turret and a wall-mounted unit.
Louvres within these units divert external fresh air into the internal spaces creating a stack
effect which in turn removes stale air or CO² from the space. Airflow, temperature and CO²
within the system are monitored and controlled via pre-set sensors within a given space.
The Airtherm “Wind-iVent” is a natural ventilation system operating on established
aerodynamic principles. As external wind flows around the terminal itself, positive and
negative pressure areas are generated. On the positive side air enters the louvres of the
terminal and is directed down through the internal vanes into the room below. The negative
pressure on the leeward side of the terminal, induces air to leave the louvres, and stale air from
the room below rises and is expelled from the terminal. This process is aided by stack effect, i.e.
as cool air enters the windward side of the unit it descends into the room below, and the warm
stale air rises in the ducts facing the leeward side.
natural ventilation technical submission
The size and type of application is virtually limitless. Additional roof-mounted turrets and wall
vents can be added for larger applications and rooms can be individually monitored and
controlled as necessary.
The features and advantages of such a system include:
•A fresh air supply for workers - proven to increase productivity & reduce staff sickness
•Naturally ventilated - reduce your energy costs and carbon footprint without the need for
mechanical ventilation
•Night time purge of stale air - creating a fresh working environment for staff the following
morning
•Better control of building temperature and CO² levels
•Free cooling
Natural Ventilation| Wind-iVent

7. Solar-iVent - Natural Ventilation Systems
How It Works
The Solar-iVent system benefits of a passive stack and an active stack system, similar to our
Wind-iVent range, but with the bonus of a free power source. Our Solar-iVent terminal
delivers fresh air and discharges unwanted stale air (CO²) from internal spaces, effectively
eliminating the need for traditional methods. The system incorporates a solar powered boostfan which provides additional 200l/s, 400l/s or 700l/s of fresh air within the compartment
below.
natural ventilation technical submission
The photovoltaic panel collects daylight and convert this to electricity that is regulated via
the charge controller which charges the battery pack. The battery is charged whenever
there is enough available daylight to do so and even generates power on a dull day. The
Solar-iVent range have been designed to supply fresh air 24 hours a day.
The low powered fans are set as standard to simply switch on/off at maximum dampers or as
an optional feature they can be speed controlled variably in conjunction with the damper
positions.
Standard Components
☼ 12v or 24v DC Power Supply.
☼ 40w or 60w solar cell.
☼ DC carbon fibre battery Pack.
☼ Power management module.
☼ Low powered DC fan unit - 200L/s, 400L/s and 700L/s
☼ iVent control systems operate with peripheral (wind, rain,
temperature) devices to suit any and temperature application.
Natural Ventilation| Solar-iVent

8. Passive iStack Natural Ventilation Systems
The passive stack ventilation systems shall operate on well-established aerodynamic principals.
The manual windows at high & mid-level in each space will provide adequate ‘fresh’ input air at
a rate that complies with Building Bulletin 101 and CIBSE guidelines and provide no less than
8 L/s per person via means of positive pressure against the face of the building structure. The
positive input air is drawn across each area and through the unit by a negative extract pressure
at the ‘Pass-iVent’ louvre face at the far side of area. Contaminated Co2 laden stale air is then
drawn through the passive stack mounted at roof level.
natural ventilation technical submission
The system should be intelligently controlled via room mounted temperature and Co2 sensors,
with occupancy Co2 levels taking presidency over that of temperature.
The passive stack roof ventilation terminals shall be constructed from fully welded corrosion
resistant type 1050 AH14 pure aluminium of 2-3mm thickness, and highly resistant to
weathering as well as chemical attack.
The units will be manufactured in accordance with BS EN ISO 9001, and to suit the
architectural and design parameters as indicated in the design specification and drawings.
Internal airways are to be protected by incorporating anti-bird mesh to the terminal louvers.
The units shall be powder coated to the RAL colour as indicated within the design specification.
If required the independent airflow testing & acoustic performance of the roof units from a
reputable source such as BRE or BSRIA to show compliance can be issued following order
placement.
Natural Ventilation| Passive-iStack

9. Natural Lighting Solutions
Day Lighting systems actively capture daylight from the rooftop and
project through a highly reflective tubing to where it’s needed. Solatube
light tube system uses the most advanced technologies to ensure that
the efficiency and performance of their systems is unrivalled.
Extension tubes are available in lengths of 610mm (straight) or 380mm
long incorporating a 0-30° adjustable angle along with the new 0-90°
angle unit. All reflective tubes – including adjustable tubes – are
manufactured from 99.7% reflective Spectralight Infinity material,
allowing tube lengths of up to 15 metres for the SolaMaster 330 DS.
The new Solatube 160 DS, 290 DS & 330 DS (250mm , 350mm and
510mm diameter respectively) set performance standards never seen
before. These systems feature patented Raybender® 3000 Technology
and LightTracker™ Reflector to deliver unprecedented levels of light –
higher even than previous Solatube models. Highly efficient and simple
to install, the Solatube Brighten Up® Series can transform dark or
windowless areas – ideal for residential applications such as kitchens,
bathrooms, hallways, stairwells, utility rooms, living areas, or may be
installed in multiples in larger, open workspaces such as corridors,
offices, consultancy rooms, store rooms, and washrooms.
Natural Ventilation| Lighting Solutions

10. Natural Lighting Solutions
DIFFUSER OPTIONS
The Brighten Up® Series offers a choice of
diffusers that incorporate Solatube® proprietary
lenses for highly effective light distribution.
Each features a sleek low-profile dress ring.
These attractive and stylish double-glazed
diffusers integrate seamlessly into most ceiling
surfaces with no visible fasteners.
VUSION™ DIFFUSER
The Vusion™ diffuser fits neatly to the
ceiling and delivers outstanding
natural light diffusion
through a prismatic lens.
OPTIVIEW® DIFFUSERS
The technologically advanced
OptiView® diffuser uses a multiple
Fresnel lens system with a stunning
architectural look to deliver crystal
clear daylight.
Available in three designs.
White Trim with OptiView® diffuser
Stainless-Tone with OptiView® diffuser
Frosted Shade with OptiView® diffuser
Natural Ventilation| Lighting Solutions

11. Specification
Material:
Extruded Aluminium
Construction: Blade mitres fully welded
Frame:
None – internal supporting frame
Fixings:
or flat
None – base suited to raised cill
Sizes:
Range from 300mm – 6.0m
Height:
0.5m to 3m high
Finish:
aluminium
Standard – mill finish
natural ventilation technical submission
and option for powder coating
High Capacity - Our natural ventilation terminals
are perfect for both natural, passive and solar
powered options, with all four sides possessing a
guaranteed 50% free area allowing a more efficient
operation.
High Performance - With the addition of internal
vertical channels and integrated water defence, our
standard terminals can be converted into high
performance Class A rain protection (over 99%
effective).
Internal & Trunk – Housed inside the terminal is a
full height divider which keeps fresh and stale air
separate. Both the terminal base and ductwork
below are lined using a Class ‘O’ type 12.5mmTHK
acoustic foam. The foam offers an ideal acoustic
characteristics and the necessary fire performance.
Additional acoustic layers can be applied to
conform to any design criteria required. The roof
lid is also acoustically lined to prevent unwanted
noise transfer from heavy rain droplets, which can
be amplified into the occupied space below. This
method also avoids condensation forming on the
underside of the roof with cold air entering the
terminal and hot stale air rising from below.
Natural Ventilation| Specification

12. uPVC volume control dampers
Standard features
Options specified
Ultra high shut off
Independent tests show no leakage below 10Pa;
the pressure most likely to be found in natural
ventilation installations.
Belimo /Siemens modulating actuators
factory fitted
The use of Belimo SM series modulating
actuators allows dampers to be set fully open,
fully closed or anywhere in between, for
maximum adjustability and assurance of
comfort.
natural ventilation technical submission
Excellent thermal insulation
With a theoretical U value of less that 1 W/m2,
uPVC volume control dampers lose.
Ultra high shut off
In independent tests, large format uPVC
volume control dampers yielded leakage
results normally only achieved by dedicated
shut off dampers.
The VCD sent for testing had a nominal size of
1000mm x 806mm, the large size tantamount
to our confidence in the damper.
With even 10Pa rarely being exceeded in
natural ventilation situations, it is clear how
uPVC volume control dampers can enhance
the efficiency of your new natural ventilation
system.
Natural Ventilation| Dampers

13. Actuators
The actuator is controlled by means of a standard control signal
DC 0 ... 10 V. It opens to the position dictated by this signal. The
measuring voltage U allows the damper position (0 ... 100%) to be
electrically indicated and serves as a follow-up control signal for
other actuators.
Manual operation is possible with the self-resetting pushbutton
(the gearing latch remains disengaged as long as the pushbutton
is pressed).
Belimo 24v 10nm Actuator
Electronic motor driven actuators for three-position and
modulating control, nominal torque 5 Nm (GDB), 10 Nm (GLB) or
2 Nm (GSF), mechanically adjustable span between 0...90°, prewired with 0.9 m long connection cables.
For damper areas up to 0.8 m (GDB) / 1.5 m (GLB), frictiondependent for GSF…1 2 up to 0.3 m2
Suitable for use with modulating controllers (DC 0...10 V) or threeposition controllers for air dampers or air throttles.
The modulation of the window free area will be in tandem with
that of the ventilator stack for each space via 24vDc chain driven
actuators, having quiet operation. The external window openings
will operate in conjunction with the same control signal as the
damper stack openings, with the exception that the windows will
operate at five positions as opposed to the 10 positions of the
ventilator actuators to minimise window motor wear and ongoing
maintenance of the DC chain driven actuators.
Natural Ventilation| Actuators
Siemens 10nm Actuator
Window Control Actuator

14. Our Range of Control Solutions
Standalone Sensors
* Room Temperature and C02 Sensor
* Room Temperature and RH Sensor
* Room Temperature and RH Sensor with manual
override
* Standard room Temperature Sensor
Natural Ventilation Controls
Our unique range of natural
ventilation controls and intelligent
sensors have been developed to deliver
optimum control and ease of use of all
our natural ventilation systems.
We can supply traditional combined
sensors (with 0/10v outputs) or sensors
with inbuilt BACnet communications
(which supply a modulating control signal
to end devices such as window actuator
controllers). Our sensors are specifically
designed to be simple to use.
natural ventilation technical submission
Intelligent Sensors
* Intelligent BACnet Room Setpoint Unit
* Intelligent Temperature and C02 BACnet
Sensor
* Intelligent Temperature BACnet Sensor with
manual override
* Intelligent Temperature and C02 level Indicator
Standalone Controllers
* Temperature and C02 Room Controller
* Temperature and C02 Room Controller with
manual override
* Temperature and C02 Sensor controller with
carbon monoxide indicator.
* Temperature room Controller with manual
override
* Temperature room Controller
We employ push button overrides, LED
status indications and clear labelling to
make things easier for the end users with
the temperature control, the room set
point for the control of the ventilation
dampers can be adjusted in 10C
increments between 210C and 280C with a
seasonal change over and a night cooling
option if a time clock or BMS time signal
is available. Localised Heating can also be
controlled and is set 20C below the room
set point.
Peripherals & Devices
* Chain Window Actuator
* Combined Weather Sensor
* Digital alarm Unit
* Digital Extension Timer
* Power supply Unit with Time Clock
* Window Control Module with Power supply.
Temp and CO2 Sensor
Natural Ventilation| i-Controls
Room Temp Sensor

15. Dynamic Thermal Modelling
Natural ventilation modelling
We can model complex natural ventilation strategies making due allowance for:
• Wind and buoyancy driving pressures
• The action of occupancy behaviour regarding ventilation openings
• Automatic controls based on temperature or CO2 levels
• Night cooling and thermal mass
natural ventilation technical submission
• Wind-iVent and other natural ventilation systems
This type of modelling is far more effective and removes the risk of under performing
ventilation systems within the building
We can advise on:
• The required number and size of ventilation solutions such as terminals, wall ventilation
and windows
• The value of night cooling and exposed thermal mass
• Appropriate strategies to meet BREEAM comfort criteria
We can offer full dynamic thermal modelling
using the market leading software. This
software utilises building integrated
modelling whereby the same software can be
used for multi-faceted studies.
Airtherm Engineering Limited can carry out
a thermal model of the building to ensure
the ventilation conforms to building bulletin
101.
Natural Ventilation| Thermal Modelling

16. Installation
Units can be installed on almost every roof including flat, pitched and even on the roof apex
where appropriate. The roof fabric of commercial applications has bearing on the openings and
roof plates that are required to install the systems competently. We offer a roof plate solution
for all situations, including self mount flashings and curb mount flashings with suitable
upstands. The options for each project will be discussed at the design stage in detail, including
the necessary openings that are required to suit our systems.
The ductwork for the units can pass through any floor level to transfer air within the building.
The units are capable of being controlled and linked to the buildings BMS to ensure dampers
are fully closed in the event of a fire. ‘Wind-iVent’ units can be controlled via master control
panels, room temperature sensors and CO² sensors.
natural ventilation technical submission
We can also offer many bespoke natural ventilation solutions to clients. Our highly skilled
work force adapt at all types of light to medium metal fabrication including stainless steel,
aluminum and mild steel. GRP moulded products are also available, most suited to circular
formation.
The most common range starts from 500mm to 1200mm and can be combined with a natural
lighting system formally known as the ‘Lite-iVent’ . The Lite-iVent (Light & Vent) system uses
both the wind and sun, and offers a ZERO carbon footprint which has no impact on the
environment.
Our installation engineers are competent in their field and carry all necessary site certification
with CSCS cards, IPATH, PASMA and scaffold towers. Our engineers strive towards excellence
in each and every project they undertake.
Natural Ventilation| Installation

17. CASE STUDIES
natural ventilation technical submission
WIND-IVENT SYSTEMS
PASS-IVENT SYSTEMS
ABBEYWOOD SCHOOL
WESTCOMBE PARK SCHOOL
MORRISON STORE
• Penthouse Passive Stack Terminals
This new build school project is the
amalgamation of two local
Primary Schools John Roan School,
& Maze Hill School situated in south
east London.
Airtherm Engineering have
recently completed the new
installation of two natural
ventilation systems for Derry
Building Services Limited
based in Newark.
NATURAL VENTILATION
• uPVC Volume Control Dampers
• 32no aqua blue ventilation turrets
• Insulated internal diverters
• Internal bird screen
• Access lockable doors
The design of the school
incorporates various environmental
features to provide a low carbon
solution, including natural
ventilation & lighting systems
The terminal sizes have been
selected by our new computer
aided software ‘Wind-iCalc’
and fully conforms to the
CIBSE requirements.
Natural Ventilation| Case Studies
Airtherm had previously
designed and selected the
correct systems to serve the
new hall within the School.
This process required critical
information to establish the
correct airflow and terminal
size, and working closely with
both Derry Building Services
and Leicester Council this
installation was a success.

18. CASE STUDIES
natural ventilation technical submission
WIND-IVENT SYSTEMS
PASSIVE VENTILATION
COPPICE PRIMARY SCHOOL
HOLFORD DRIVE SPORTS CENTRE
THE MIDLAND STUDIO
The Coppice Primary School is a
two form entry school ,though
larger than the average primary
school. Airtherm completed the
1st phase works by installing
two ‘Wind-iVent’ Systems to the
newly completed single storey
class rooms. The 2nd phase fix
features a further six 1.2msq
units for the Hall area which will
be used mostly by the Church,
and a further six 1.1msq units
serving the Classrooms
The newly built sports centre is based in
Perry Barr, Birmingham and will hold high
end boxing national events.
Airtherm Engineering have
recently completed the new
installation of two natural
ventilation systems at Midland
College Studio. Airtherm were
MVS Ltd first choice when
considering the scheme due
our knowledge and experience
on previous installations.
The new installation of fourteen
natural ventilation systems for
MVS Limited had been designed
and carefully selected from the
room data sheets provided,
ensuring adequate ventilation
rates for the pupils are met.
The natural ventilation systems
have been designed in line with all
current publications such as CIBSE
guidelines, AM10 Natural
Ventilation in commercial buildings
and Building Bulletin 101.
NATURAL VENTILATION
Natural Ventilation| Case Studies
There are six terminals located within the
sports hall and one situated within the
mezzanine floor area serving the office
space.
Airtherm also provided the control
solution which consists of standalone
room temperature and C02 sensors and
Red Lion interface panel.
The project involved the use of
our Airtherm wall mounted icontrol solution which
consists of room mounted ABS
plastic control panel C/w inbuilt temperature sensor, C02
self-calibrating carbon dioxide
sensor with traffic light
indicators, night time cooling
and external rain sensors. The
complete system was
commissioned by our
appointed engineers.

19. natural ventilation technical submission
0844 809 2509 | airtherm.co.uk | info@airtherm.co.uk