Acoustic solutions revsion - Passivent

Acoustic Solutions

Contents
Sound thinking from Passivent
Air In
Information about our range of
acoustic wall and window vents
SRT+
SoundScoop
Further information
“The Passivent vents helped us meet planning requirements
for both background ventilation and noise attenuation. The
Passivent vents have helped us minimise the number of
façade penetrations, yet ensure both heat and ventilation
work effectively.”
- Steven Noon, for McInerney Homes
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Sound Thinking
from Passivent
The problem
An increase in the number of building
projects occurring in more developed areas
means that the problem of noise pollution
should be a major consideration for any
new building project. More people having
to live and work in closer proximity only
adds to the issue.
Many new developments are also taking
place on brownfield sites with residential
properties close to motorways, railway
lines and industrial estates.
A noisy environment can be a major cause
of stress for occupants, as can a stuffy
poorly ventilated workspace or property.
Occupants can be affected by noise in
different ways. Examples could be:
• Noise within a school can distract
children and teachers from learning and
teaching
• People who work within offices near
busy roads or motorways can be
distracted from their work
• Hotels within city centres could lose
repeat business if customers are unable
to sleep
• Residents can be disturbed within their
homes, increasing stress levels
Walls and windows whilst blocking out
external and internal noise can also block
pathways for air transfer between the fresh
air outside, and the circulating air between
internal rooms.
Proper ventilation is a requirement within
any property. In a domestic building Moist
stale air must be removed and fresh air
must be allowed to enter. This removes
“A noisy environment
can be a major cause of
stress for occupants, as
can a stuffy poorly
ventilated workspace
or property”
pollutants and improves air quality
providing a healthier environment which
benefits the occupants.
Within a commercial building ventilation
is needed to remove CO2 and maintain a
comfortable temperature.
The Solution
Passivent understands these issues and
can provide a full range of acoustic
background ventilation solutions to suit
an wide range of building applications.
Our products are not only extremely
effective but also use no energy
providing a maintenance free
unintrusive, environmental solution
which lasts the life of the building.
These can then be coupled with either a
passive or mechanical ventilation system
to ensure the most effective design.
Barely audible sounds begin at about
10dB (breathing) and reach painful levels
at around 120dB (loud concert). Other
examples include:-
Soft Whisper (30dB)
Conversation (60dB)
Average Factory (80dB)
Plane taking off (140dB)
Our products help to reduce noise ingress
by up to 55dB which dramatically
reduces the effect on the occupant whilst
still maintaining airflow.
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Air In
Whilst a passive or mechanical ventilation
system is required to remove moist stale air,
background ventilation is required to ensure
clean, fresh air is supplied into the property.
This also prevents a build up of condensation.
Passivent offer a range of through wall and
window vents which can be used for a wide
range of background ventilation solutions.
Both sets of products can either be manually
operated, or through an internal humidity
sensors which open and close automatically as
required.
The automatic option requires no user input,
ensuring the ventilation system is working to
maximum efficiency all the time. Engineered
to exacting standards, our products are
designed to dramatically reduce unwanted
noise whilst also ensuring the property is
properly ventilated.
They can be included across a wide range of
building types including both single and
multiple occupancy properties such as
apartments, student accommodation, hotels
and care homes.
Many of these products are BBA certified in
conjunction with Passivent whole house
ventilation systems. For each Passivent BBA
approved whole house ventilation system, only
one Passivent BBA approved background
ventilator is required to meet building
regulations in England, Wales, Scotland and
Northern Ireland, whereas non BBA approved
systems will require additional amounts to
comply with regulations.
Fresh Wall Vents
The Passivent Fresh acoustic wall vents
comprise of high-quality non-mechanical
construction for through-wall installation in
domestic and small commercial buildings.
They can provide up to 55dB noise reduction
and are suitable for new build and
refurbishment projects.
Features
• Sound Reduction up to 55dB D,n,e,w
• Options for automatic opening and closing
dependent upon relative humidity levels
• Manual override if required
• Filter and condensation protection
incorporated
Image shown: Fresh 99HdB
Wall sleeve outside diameter 99mm.
Suitable for any wall thickness up to
350mm as standard (or more to special
order).
Acoustic Window Vents
Our acoustic window vents can offer up to 42dB
attenuation and can be fixed into the window
frame with an external grill. They are ideal for
new build of refurbishment projects and allow
fresh air to enter habitable rooms.
Features
• Substantial Sound Reduction
• Internal filter prevents insect and dust ingress
• Simple and easy operation
• Suitable for areas with high risk of abuse
• Options for humidity sensitive operation
• Option for through frame or over glazing
applications
Example shown ALdB acoustic window vent
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External Grille
140x140mm
Internal controller
140x140mm

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Overall Range and Performance
Acoustic Wall Vent
Fresh 80dB
Fresh 90dB
Fresh 100dB
Fresh 99HdB (humidity sensitive)
Acoustic Window Vent
ALdB 450/40
ALdB 800/42
ES4dB (humidity sensitive)
Acoustic Overglass
Free Area (mm²)
4000
6000
6000
6000
Free Area (mm²)
4200
4200
4000
See vent
The SRT+ through wall vent offers up to
55dB noise reduction with the added benefit
of a discreet, non mechanical vent.
SRT+ is engineered so that most of the
construction is housed within the brickwork
of the property. The small, internally visible
vent is designed to direct airflow upwards
meaning cooler incoming air is not directed
towards occupants. The incoming air is given
the chance to mix with the warmer internal
eliminating the risk of draughts.
Features
Sound Reduction
Sound reduction of up to 55dB to reduce
occupant disruption.
Efficient Air Distribution
Designed air flow pattern to prevent
draughts and provide efficient air
distribution.
SRT+
Equivalent area (mm²)
2220
2630
3200
3350
Equivalent area (mm²)
2500
2012
2760
1595
Acoustic Performance
50dB
45dB
42dB
42dB
Energy Efficiency
Being non-electrical, the Passivent SRT+
is ideal as part of an energy efficient
ventilation system.
Ease of Installation
As there are no electrical connections to be
made, installation is made as simple as
possible.
Simple Maintenance
With no electrical or mechanical parts to
malfunction, the vent requires minimal
maintenance.
Acoustic Performance
40dB
42dB
39dB
37dB
Fresh 80/100dB Fresh 90dB Fresh 99dB ES4dB Acoustic Overglass
No occupant interaction
Fully automatic operation so occupants can
not close.
To see the brochure for our full range of
background ventilation products visit
www.passivent.com.
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SOUNDSCOOP
Cross-ventilation or free air transfer
between internal spaces is an important
aspect of ventilating the whole building.
But at the same time most buildings require
acoustic separation between noisy areas
and noise-sensitive areas.
SoundScoop has been specifically
designed to meet these conflicting
requirements with a large free ventilation
area, low airflow resistance and high levels
of noise reduction. The design results in
half the speech noise level whilst providing
50% more flow area.
Available in a number of lengths,
SoundScoop outperforms any other
equivalent product in terms of attenuation
of speech and footfall which are the
requirements of an internal acoustic
transfer.
Examples where SoundScoop could be
used are:-
• Between an open office and private
meeting room
• A school corridor and a quiet
classroom
• In hotels between corridors and guest
rooms
Reasons to use SoundScoop
• Optimised acoustic design for the
transfer of air between noisy and
noise sensitive spaces
• Extremely low airflow resistance due
to an entirely unimpeded acoustic
path (coefficient of discharge [Cd
value] of 0.71)
• Provides up to a 90% increase in open
area compared to previous market
leading product
• Cost competitive solution
• Available in standard and high
performance acoustic foam versions,
and a range of sizes to suit the
application
• All the configurations have been
independently tested for acoustic
performance
• Designed and manufactured to allow
flat packed national and international
transportation, with unit weights
ranging from 1.7 to 18.3kg
• Manufactured and available in the UK
ready assembled for installation on
site
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Typical application
SoundScoop used as a cross ventilation
path between two spaces
receiver plane
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SoundScoop positioned outside
plane of source and receiver
quiet boardroom
The performance of the SoundScoop has
been achieved through consideration
of three design features, each of which
are necessary for it to work most
effectively.
By positioning the unit out of the plane of
source and receiver, sound is forced to take
an oblique path through the vent thereby
removing the need for bends or splitters.
Optimised cross-sectional dimensions are
used to target attenuation over the desired
range of frequencies. The SoundScoop is
sized so that the ‘cut-on’ frequencies, end
reflection and amount of attenuation is
optimised for the target 500Hz to 2kHz
speech range.
The patented internal lining which
features ribs at regular centres has been
shown to provide more than 10dB of sound
attenuation in a given octave band.
noisy atrium
separating construction
Achieving BB93 minimum standard.
Current regulations state that there needs to
be a minimum level of noise reduction for
the combined elements which separate one
room from another. For example the
ventilation element for air transfer between
rooms must have a minimum open area of
0.4m² combined with a noise reduction of
39 D,n,e,w. As each SoundScoop has a free
area of 0.1m², four 620mmx320mm units
are needed to comply with the free area
requirement. Regarding the acoustic
performance criteria, SoundScoop is able to
comply with BB93 by calculating a
performance based on a holistic approach
to the construction rather than the stand
alone item.
SoundScoop is also more effective at
reducing more frequencies than other
similar acoustic solutions.
For more information about
SoundScoop visit the www.passivent.com
to download a brochure.
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noise source plane
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The Passivent range of background
ventilation can be used to help achieve the
background ventilation requirements
specified within the necessary building
regulations.
The range can be used as part of a full
house ventilation strategy using our natural
and mechanical ventilation systems for
both residential and commercial properties.
Mastercare Installer scheme
We recommend that installation is carried
out by a specialist Passivent Mastercare
Installer. The Mastercare scheme, operated
by Passivent Limited, comprises wellestablished
and reputable companies who
have been fully trained and assessed by
Passivent Limited to install any Passivent
system in both new build and
refurbishment projects.
Mastercare Provides
Assurance that work is carried out by
trained and experienced installers who are
familiar with the systems.
• Quality installations
• Compliance with relevant codes of
practice
• Competitive cost
Further Information
PASSIVENT PASSIVENT LIMITED LIMITED
LIMITED
All Passivent Mastercare Installers hold a
certificate from Passivent Limited. They
are regularly monitored to ensure standards
of work are maintained, and also receive
full technical support from Passivent
Limited.
Quality assurance
Passivent products are designed, developed
and manufactured under a BS EN ISO
9001 quality management system, giving
an independently audited assurance that the
products will fulfil their intended purpose.
Environment
Passivent conducts all
business processes
under a BS EN ISO
14001 environmental
management system,
giving an assurance that
all activities are carried out having minimal
impact on the environment.
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2 Brooklands Road, Sale, Cheshire, M33 3SS Tel: 0161 905 5700 Fax: 0161 905 2085
Email: technical@passivent.com Web: www.passivent.com
A A A member member of of the the Building Building Product Product Product Design Design Design Group
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