NATURAL AND ENERGY-EFFICIENT VENTILATION SYSTEMS FOR ... · NATURAL AND ENERGY-EFFICIENT...

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NATURAL AND ENERGY-EFFICIENT VENTILATION SYSTEMS FOR

DOMESTIC BUILDINGS

CI/SfB (57)

Uniclass L753

November 2007

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CONTENTS

INTRODUCTION 4-5

Passivent systems, Technical context 6-8

EXTRACT VENTILATION SYSTEMS 9-10

Passive Stack Ventilation (PSV) 11-15

PSV Whole-House 12

PSV Single-Stack 13

PSV Design and Installation 14-15

Mechanical Extract Ventilation (MEV) 16-23

Passivent MEV 18

Passivent iMEV 19

Passivent AV 20-21

Passivent Flair 22-23

Positive Input Ventilation (PIV) 24-25

BACKGROUND VENTILATION 27-29

Window vents 30-41

Fresh wall vents 42-44

ACOUSTIC VENTILATION 45

Acoustic solutions: Systems 46-47

Acoustic solutions: Background ventilation 48-53

COMBUSTION AIR VENTILATION 54-56

COMPONENTS, SERVICES 57

Selected components 58-61

Design and support, Services 62-63

References 64

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PASSIVENT… the natural and energy-efficient ventilation specialists

Passivent Limited are the leading

specialists in natural and energy-efficient

mechanical extract ventilation for domestic

buildings.

● Expertise

Passivent have an unrivalled expertise in

designing and developing ventilation

solutions to meet the most up-to-date

technical and regulatory requirements.

● Immense experience

During the last 15 years over 30 000

Passivent systems have been installed in

the UK alone, giving efficient and effective

ventilation at all times. There is also a vast

range of experience with Passivent systems

over many years in Europe.

● Technical and design capability

We can provide authoritative technical

support, advice and design services.

● Comprehensive range

The Passivent range provides ventilation

systems and products tailored to all types

of domestic applications.

● Energy-efficient

Passivent systems are extremely energy-

efficient, typically providing higher energy

ratings than other forms of ventilation.

They offer many advantages over other,

non-responsive, systems.

● Building regulations compliance

Passivent systems can be used to meet

building regulations requirements

throughout the UK and Ireland.

● Innovation

We are constantly developing our

ventilation systems and components to

meet new requirements and further

improve performance.

● Quality assurance

All Passivent systems and components

have been designed, developed and

manufactured under a BS EN ISO 9001

Quality Management System.

Independent auditing provides the user

with assurance that the products will fulfil

their intended purpose.

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PASSIVENT SYSTEMS OVERVIEW

● Passivent offer a range of passive and

mechanical extract ventilation systems

which meet the requirements for

dwellings set out in Building Regulations

Approved Document F (England and

Wales), and similar requirements for the

whole of the UK and the Republic of

Ireland.

For more details of Building Regulations

requirements see page 8.

● Passivent BBA Certificated PSV and MEV

Whole-House systems provide the

required functions of:

- extract ventilation to remove pollutants,

and

- whole building (background) ventilation

to provide a supply of fresh air

These systems have major advantages over

ventilation based on individual extract fans.

● Passivent window/wall ventilators can

provide whole-building (background)

ventilation for Intermittent Fan (System1)

and Continuous Mechanical Extract

(System 3) systems by others.

● Positive Input Ventilation (PIV) is an

alternative strategy which is acceptable

under Approved Document F provided

compliance can be demonstrated.

NATURAL AND ENERGY-EFFICIENT VENTILATION FOR DOMESTIC BUILDINGS

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PASSIVENT SYSTEMS

Passive Stack Ventilation (PSV) see pages 11-15

(Approved Document F System 2)

Applications: Public and private housing, primarily for individual

houses and flats.

New-build, major refurbishment

Main features: Continuous demand controlled ventilation, silent operation,

no energy consumed

Mechanical Extract Ventilation (MEV) see pages 16-23

(Approved Document F System 3)

Applications: Public and private housing. Houses, flats,

multi-occupancy buildings such as nursing homes,

student accommodation, hotels.

New-build, major or minor refurbishment

Main features: Single central fan connected to multiple extracts,

continuous low-level ventilation, quiet operation

Positive Input Ventilation (PIV) see pages 24-25

(Approved Document F paragraph 0.15)

Applications: Public and private housing. Houses, flats.

Major or minor refurbishment

Main features: Ductless system, easy to install.

Background Ventilation see pages 27-44

(Approved Document F Systems 1, 2 and 3)

Applications: Public and private housing. Houses, flats, multi-

occupancy buildings such as nursing homes,



Main features: Large range of controllable window and through-

wall vents.

Acoustic Ventilation see pages 45-53

(Approved Document F Systems 1, 2 and 3)

Applications: All types of housing in areas of high noise levels

Main features: PSV, MEV and background ventilation with acoustic

treatment for sound reduction


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TECHNICAL CONTEXT

Why ventilate

Ventilation is essential in all buildings for

the well-being and health of the occupants

to:

● Provide a supply of fresh air for persons

using the building, creating a comfortable

environment.

● Extract moisture at source from areas

where it is produced in significant

quantities (eg kitchens and bathrooms),

thereby combating condensation.

● Dilute and remove pollutants including

dust mites, tobacco smoke and cleaning

chemicals, promoting a healthier air

quality.

● Aid the removal of occasional high

concentrations of pollutants and water

vapour.

● Ventilation may also be used to improve

thermal comfort and reduce overheating

of buildings in summer.

Energy savings

Buildings are being made more and more

airtight, driven by government regulations

to save energy and reduce carbon emissions.

Previous fortuitous ventilation routes (by

natural infiltration) are being sealed,

increasing the importance of an effective

ventilation strategy.

The need to reduce energy consumption and

combat climate change means that energy

savings must be made in buildings. It is

therefore vital to select an effective and

energy-efficient method of ventilation.

Passivent systems are proven to be among

the most energy-efficient.

Energy efficiency and SAP

Government action in response to climate

change is driving the demand for increased

energy efficiency. By 2016 the Government

wants all new dwellings built to be ‘zero-

carbon’. As part of building regulations

improvements, all new housing has to be

energy rated; this is achieved through the

Standard Assessment Procedure (SAP).

Passivent PSV with no electrical

consumption and automatic operation is

naturally energy-efficient.

To allow flexibility and encourage

innovation, energy-efficient systems can be

independently tested and their actual

performance used in the SAP through the

‘Appendix Q’ route instead of the SAP default

value.

The use of energy-efficient DC fans in all

Passivent MEV systems makes them more

energy efficient than the SAP MEV default

value.

Health benefits

Proper ventilation of buildings has been

shown to help reduce the incidence of

asthma and other allergy related problems.

Controlled ventilation

Traditional buildings had a considerable

amount of accidental ventilation through air

infiltration. In order to reduce energy loss,

modern buildings (and refurbished

buildings) are increasingly required to meet

standards for reduced air leakage. By itself,

this would lead to problems arising from

lack of ventilation.

A ventilation strategy is therefore required to

provide good indoor air quality whilst

minimising energy loss through unintended

air leakage. The concept of 'build tight -

ventilate right' means:

- Minimising the amount of accidental and

uncontrolled air leakage through the

building envelope

- Providing controlled ventilation to supply

the required level of fresh air and expel

moisture vapour and other air pollutants. In

other words, ventilation where and when it

is needed.


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TECHNICAL CONTEXT

For guidance, please refer to:

Scotland

Building (Scotland) Regulations 2004,

Technical Handbook Domestic Section 3

Environment (2007).

Northern Ireland

Building Regulations (Northern Ireland)

Technical Booklet K Ventilation (1998).

Republic of Ireland

Building Regulations Technical Guidance

Documents, Part F Ventilation (2002).

Associated regulations

The building regulations for energy

conservation also require control of air

leakage rates through the building fabric

(England and Wales Part L) and provision of

an air supply for fuel-burning appliances

(combustion air, England and Wales Part J).

Ventilation design

A designed ventilation strategy should make

use of the following elements:

● Extract ventilation from 'wet' rooms

including kitchens, bathrooms, utility

rooms and WCs, to remove water vapour,

together with other pollutants, directly

from the rooms where it is mostly

generated.

● Whole building ventilation to provide a

supply of fresh air from outside. This also

has the function of diluting and dispersing

pollutants wherever they are generated

within the building.

● Purge ventilation to remove high

concentrations of pollutants generated by

occasional activities such as painting and

decorating.

Building Regulations requirements

The basic requirement of regulations is that

there should be adequate means of

ventilation for the occupants of a building.

Requirements, and detailed means of

satisfying them, are given in the documents

listed below.

Passivent Technical Services Team can also

provide advice and guidance on ventilation

and regulatory compliance.

England and Wales

Approved Document F Means of ventilation

(2006).

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EXTRACTVENTILATION SYSTEMS

Passive Stack Ventilation (PSV) 11-15

PSV Whole-House 12

PSV Single-Stack 13

Mechanical Extract Ventilation (MEV) 16-23

Passivent MEV 18

Passivent iMEV 19

Passivent AV 20-21

Passivent Flair 22-23

Positive Input Ventilation (PIV) 24-25

EXTRACT VENTILATION SYSTEMS

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PASSIVENT SYSTEMS

Passivent have ventilation systems tailored for all types of domestic applications and to meet

the requirements of building regulations.

Passive Stack Ventilation (PSV) see pages 11-15

(System 2)

Applications: Public and private housing, primarily for individual

houses and flats.

New-build, major refurbishment

Main features: Continuous demand controlled ventilation, silent operation,

no energy consumed

Mechanical Extract Ventilation (MEV) see pages 16-23

(System 3)

Applications: Public and private housing. Houses, flats,

multi-occupancy buildings such as nursing homes,


New-build, major or minor refurbishment

Main features: Single central fan connected to multiple extracts,

continuous low-level ventilation, quiet operation

Positive Input Ventilation (PIV) see pages 24-25

Applications: Public and private housing. Houses, flats.


Main features: Ductless system, easy to install.


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PASSIVE STACK VENTILATION (PSV)


System 2

The PSV principle

Passive stack ventilation (PSV) is driven

primarily by the natural stack or convection

effect by which warm air rises.

Moisture-laden air is extracted directly from

wet rooms (kitchens, bathrooms etc)

through ducting up to a roof terminal where

it is vented to the outside. The air inside a

house is almost always warmer than that

outside, and so rises up the duct by natural

convection, carrying moisture with it. Wind

blowing across the roof provides additional

suction (the venturi effect).

Colder air outside

Warm moist air inside

Moisture-laden warm air rises up

duct and is exhausted through

roof terminal


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PSV WHOLE-HOUSE

A PSV Whole-House system ventilates all the

rooms in a property effectively, using the

concept of planned air routes to ensure a

fresh healthy environment.

Planned air routes

Moisture is extracted at source from wet

rooms (kitchens, bathrooms etc).

Air inlets located in dry rooms (living rooms,

bedrooms etc) provide a flow of replacement

fresh air into the building.

The siting of the inlets and extracts ensures

that air always moves from dry rooms to wet

rooms, so that moisture is removed and the

whole house is ventilated.

Applications

Suitable for both new-build and

refurbishment in private and social housing.

Primarily designed for individual houses and

low-rise flats and apartments.

Demand control

Ventilation is controlled by ‘intelligent’ inlets

and extracts which respond automatically to

changes in relative humidity, thereby

modulating the ventilation rate in each

room to meet demand. When humidity is

low the ventilation rate is minimised,

irrespective of external weather conditions,

preventing unnecessary heat loss.

Both inlets and extracts are operated by a set

of nylon strands which respond to humidity

levels and regulate the size of the air opening,

giving greater ventilation when humidity is

high whilst preventing unnecessary

ventilation when humidity is low.

Features and benefits

● Natural and energy-efficient

No electrical connection or power source

is required, so Passivent PSV systems are

naturally energy-efficient.

● Continuous operation

The system provides 24-hour

condensation control with continuous

gentle extraction. It operates all day and

every day as required, combating

condensation and mould growth.

● Reduces requirement for background

ventilation

Using PSV means fewer tricklevents or

wall vents are required, when compared to

using intermittent fans.

● No noise

Passivent PSV systems are completely

silent in operation.

● Ideal for special needs

With its automatic response and no

operating controls, Passivent PSV is ideal

for special-needs applications.

● Minimal maintenance

No mechanical components to go wrong.

● BBA approved

Passivent PSV Whole-House systems are

covered by BBA (British Board of

Agrément) Certificate No 96/3273.

● Design service

Passivent Limited offers a design

service for PSV systems, see over.

Typical PSV Whole-House ventilation systemAll air inlets and extracts respond automatically

to relative humidity in rooms. Air movement

is from dry to wet rooms.

Kitchen with air extractLiving room with air inlet

Bathroom

with air

extract

Bedroom with air inlet

Separate roof

terminal for each

stack

Building regulations

Passivent systems can be used to satisfy

building regulations requirements

throughout the UK and the Republic of

Ireland for extract and whole-house

ventilation for domestic and domestic-type

properties

See also the general introduction page 8.

More information is available on request.

Passivent systems also meet the regulatory

requirements for security, avoiding draughts

and preventing rain ingress.

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PSV SINGLE-STACK

As a quiet alternative to an individual room

extract fan, PSV Single-Stack systems can be

installed to ventilate individual en-suites or

bathrooms.

They operate by the same natural stack effect

as PSV Whole-House systems, and hence

represent a superior alternative to a fan.

They provide the same benefits of demand

control, continuous operation and energy

efficiency as PSV Whole-House systems, and

are easy to install.

Individual or

en-suite bathroom

with air extract

Roof terminalTypical PSV Single-Stack systemExtract responds automatically

to relative humidity.

Applications

Suitable for both new-build and

refurbishment in private and social housing.

Particularly useful as a low-cost

refurbishment installation in social housing.


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SYSTEM DESIGN AND INSTALLATION

Design of a system for an individual property

is quite simple using our online design and

quotation web site at www.passivent.com .

Alternatively Passivent Limited offers a

design service for PSV systems, based on

building drawings supplied.

A full installation guide is supplied with

every Passivent PSV system.

System components

Standard stack kits are available as shown.

Where these are not suitable, alternative

configurations can be supplied. Extension

ducting is also available for properties over

two storeys.

For individual components (air inlets,

terminals, ducting) see the Components

section page 58.

Code Description

A161 Humidity-sensitive extract

F12513 Uninsulated flexible ducting, 3.0m

F12524 Insulated flexible ducting, 4.0m

FCA3 Flat channel straight connector

FCA4 Flat channel circular connector

FCA6 Flat channel circular adaptor

FCA10 Flat channel elbow connector

FCA11 Round pipe

FCD1 Flat channel ducting, 1.5m

MC01 Sleeve coupling, male 125mm

PRT Ridge terminal

TT7 In-Line tile/slate terminal

TT9 Tile terminal

X332 Speed clamp

Terminals must be no more than 0.5 metre

down from the ridge.

Each duct must run to a separate terminal

Ducts must rise vertically or near-vertically,

preferably not more than 45° from vertical

with a maximum of 2 no. bends

Use insulated

ducting in the roof

void and other unheated

spaces

Support flexible ducting every 300mm to a wire or timber batten to

prevent sagging

Within the building, run circular

ducting in a room corner or inside a

fitted cupboard or wardrobe.

Alternatively run flat channel ducting

within a stud partition

Site each air

extract in a

‘wet’ room

(kitchen,

bathroom)

Site air inlets in ‘dry’ rooms

(living rooms, bedrooms etc)

Air flow from ‘dry’ to ‘wet’ rooms

Bedroom Bathroom

KitchenLiving room

There is usually sufficient air flow around internal doors

to provide replacement air. If this is insufficient a door

undercut of 10mm or an air transfer door grille should be

used.

No electrical connections are required.

The main features of a typical installation

with the points which must be observed are

shown below.

For simplicity of design and ordering, a

number of standard stack kits are available.

Ordering

To order Passivent-designed PSV systems

simply state the quotation number and plot

or plots required followed by the ridge or tile

manufacturer, make and colour. For self-

designed PSV systems simply quote the stack

kit reference and quantity of each required,

followed by the ridge or tile manufacturer,

make and colour, and the inlet type and

quantity required.

Typical layout (schematic)Actual installations may differ in detail. Follow the

design layout if one is provided.

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Specification clause

Select options required,

and insert information

where necessary.

Passivent PSV Whole-

House ventilation system

Provide a BBA-Certificated

ventilation system

complying with Building

Regulations (England and

Wales) Approved

Document F OR Building

(Scotland) Regulations

Technical Handbook

Domestic Section 3 OR

Building Regulations

(Northern Ireland)

Technical Booklet K OR

Building Regulations

(Republic of Ireland)

Technical Guidance

Documents Part F, by

means of a whole-house

passive stack ventilation

(PSV) automatic system

comprising:

Humidity-sensitive

wall/window inlet vents

operating between 47%

and 65% relative humidity,

sited in habitable rooms as

required. Humidity-

sensitive ceiling extracts

operating between 30%

and 75% relative humidity

sited in kitchen, bathroom,

utility room and WC; each

extract to be ducted

separately to a roof

terminal matching and

forming an integral part of

the ridge, or to pitched roof

tile/slate terminals sited no

lower than 0.5 metres

down from the ridge.

Ridge terminals to have an

air flow resistance not

exceeding 10Pa at an air

movement rate of 100m2/h.

Tile/slate terminals to have

an air flow resistance not

exceeding 5Pa at an air

movement rate of

100m2/h. All terminals to

provide insect and weather

protection, and be

designed to ensure any

condensate forming will

run off on to the roof. All

ducting in roof spaces and

other unheated spaces to

be fully insulated with

25mm insulation.

The system to be Passivent

PSV Whole-House system

covered by BBA Certificate

96/3273, supplied by

Passivent Limited,

2 Brooklands Road, Sale,

Cheshire M33 3SS.

Telephone: 0161 962 7113,

fax: 0161 969 5346,

email: [email protected].

Installation to be in

accordance with the

manufacturer’s

instructions, and to be

carried out by a Passivent

Mastercare trained

installer holding a current

certificate.

Layout and installation

must comply with any

design recommendations

supplied.

PSV 01 Kit

Typical ground floor kitchen:

Flat ducting, ridge terminal.

PSV 02 Kit


Circular ducting, ridge terminal.

PSV 03 Kit


Circular ducting, tile terminal.

PSV 04 Kit


Wall extract, flat ducting, ridge

terminal.

A161

PRT

X332

F12524

FCA4

FCA6

FCD1

FCA3

FCD1

FCA6

X332

A161

PRT

X332

F12524

X332 X332 X332

MC01

X332 X332

F12513

X332

A161

F12513

X332

TT9 PRT

X332 X332

F12524 F12524

MC01

A161

FCA4

FCA6

FCD1

FCA3

FCD1

FCA10

FCA11

PSV 05 Kit

Typical first floor bathroom:

Ridge terminal.

PSV 06 Kit


Tile terminal.

PSV 07 Kit


Wall extract, flat ducting, tile

terminal.

PSV 08 Kit


Flat ducting, tile terminal.

A161

TT9

X332

F12524

FCA4

FCA6

FCD1

FCA3

FCD1

FCA6

X332

PSV 09 Kit


In-Line tile/slate terminal.

Not suitable for kitchens.

TT7

X332

F12524

A161

X332

PRT

X332

F12524

TT9

X332

X332

F12524

A161

FCA4

FCA6

FCD1

FCA3

FCD1

FCA10

FCA11

A161

X332

TT9

X332

F12524

A161

X332


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MECHANICAL EXTRACT VENTILATION (MEV)

MECHANICAL EXTRACT VENTILATION

(MEV)

System 3

Passivent MEV systems

Passivent Mechanical Extract Ventilation

(MEV) systems provide continuous

mechanical extraction at a low rate,

boostable (manually or automatically) to

extract at a higher rate when required.

Whole-house systems comprise a remotely

located central extract fan connected by

ducting to extracts in wet rooms (kitchen,

bathrooms etc), with air inlets located in dry

rooms only (eg living rooms, dining rooms,

bedrooms).

Planned air paths

Moisture is extracted at source from wet

rooms. Air inlets located in dry rooms

provide a flow of replacement fresh air into

the building. The siting of the inlets and

extracts ensures that air always moves from

dry rooms to wet rooms, so that moisture

and other pollutants are removed at source

and the whole building is ventilated.

Low-power continuously-

running central extract fan located in

loft space (or cupboard)

Air extracts

located in wet

rooms

Extract ducts may serve

a number of rooms

Air is exhausted

through roof (or

wall) terminals

MEV Systems

Passivent has a range of MEV systems

which can be matched to the intended

application.

Passivent MEV

Continuous extract system with boost,

automatic or manual, provided by extracts.

Primarily individual systems for houses

and apartments.

Passivent iMEV

Continuous extract system with boost

provided by automatic humidity-sensitive

control of fan speed and extracts. Provides

individual room control automatically.

Passivent AV

Continuous extract system with boost,

automatic or manual, provided by extracts.

Primarily multiple systems for apartments

and multi-occupancy applications.

Passivent Flair

Continuous extract system for new-build

apartments, integrating the latest design

in cooker hoods.

17

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Applications

MEV systems are suitable for a wide range of

applications including houses, apartments

and multi-occupancy buildings such as

nursing homes, student accommodation and

hotels.

In flats and apartments MEV systems can be

designed to ventilate either an individual

apartment or several apartments

simultaneously.

Systems are suitable for both new build and

refurbishment.

Features and benefits

● Tailored systems

The range of extracts enables systems to

be tailored specifically to suit individual

room applications.

● Demand control

Humidity-sensitive system, with

automatic boost to meet greater demand

when required, provides greater comfort

and energy efficiency.

● Planned air movement

The positions of inlets and extracts ensure

that air always moves from dry rooms to

wet rooms, where it is extracted.

● Continuous extraction with boost

Continuous gentle extraction at all times;

the system operates all day and every day,

boosting as required.

● No noise problems

The fan is normally installed in the roof

space or a cupboard to avoid noise

problems.

● Ideal for special needs

Automatic iMEV option ideal for special

needs, with no manual control required.

● Energy-efficient, low maintenance

Fans have a low energy consumption, and

minimal maintenance is required.

● Simple installation

Requirement for background ventilation

(air inlets) is significantly reduced

compared with intermittent extract fans.

● Design service

Passivent Limited offer a design service for

MEV systems.

Building Regulations and energy

performance

The Government’s Standard Assessment

Procedure (SAP) is the method for

calculating the energy rating or performance

of dwellings to comply with Building

Regulations. Registered SAP assessors use a

computer program to calculate

- the SAP rating

- the Target CO2 Emission Rate (TER) based

on standard values for a dwelling of the same

size and shape, and

- the Dwelling CO2 Emission Rate (DER),

based on the performance values for the

actual dwelling being assessed.

For compliance, the DER must be no worse

than the TER.

Appendix Q of the SAP allows the use of

actual performance data derived from

independent assessments of systems, in place

of default values. For energy efficient

systems such as Passivent MEV this method

can provide an enhanced SAP rating.

The A151DC fan used in the Passivent MEV

system is included on the Appendix Q web

site.

System design

Passivent offer a design service for our MEV

systems, based on building drawings

supplied.

Initially an outline proposal and estimate for

a system will be prepared; following

acceptance of this, a full design and costing

will be prepared.

System installation

A full installation guide is supplied with each

mechanical extract ventilation system.


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PASSIVENT MEV

Description

Extraction is driven by a single low-power

consumption DC fan. This is normally

installed in the roof space or a cupboard and

mounted to avoid noise disturbance. Fans

operate efficiently at all times whether vents

are fully open or virtually closed.

Extraction can be boosted by a control

switch, which shows the user via an LED

display, the level at which the fan is

operating.

BBA approved

Passivent MEV Whole-House systems are

covered by BBA (British Board of Agrément)

Certificate No 96/3273.

System components

Extract fan A151DC

Low-wattage DC continuously-running fan,

specially designed for efficient extraction of

air along lengthy ducts.

Extract

A125 extracts located in ‘wet’ rooms.

Other components

For air inlets, terminals, and ducting, see the

Components section on page 58.

Individual house Apartments: individual systems

Typical MEV Whole-House ventilation systems

Air movement is from ‘dry’ to ‘wet’ rooms

Bathroom

Kitchen

Kitchen

Kitchen Bathroom

Bathroom

System installation


system.

Extract fanExtract fan

Extract fan

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PASSIVENT iMEV

Description

Innovative and intelligent, iMEV is a totally

new concept in central mechanical extract

ventilation. The system automatically

provides, without any occupant involvement,

individual room control, and is eminently

suitable for both houses and apartments.

The low-energy DC central extract fan

incorporates a humidity sensor linked to a

microprocessor that continuously monitors

the relative humidity of the extracted air.

The fan is linked via ducting to humidity

responsive extracts located in the ‘wet’

rooms. These open and close in response to

relative humidity. Sensing increasing

humidity the processor will progressively

boost the fan.

Therefore when relative humidity increases

in that room:

1. the extract in that room will open

2. the humidity of the exhaust air will

increase

3. the fan speed will increase

4. thus boosting the extract rate from the

room containing the open extract.

As humidity is reduced the extract will close

and the fan will slow down to its normal

running setting, until relative humidity in a

wet room increases again.

System components

Extract fan A151DCH

Low energy central extract fan containing

integral humidity sensor and

microprocessor. Progressively boosts extract

rate in response to increasing levels of

relative humidity in the extracted air.

Extracts

A121 humidity

sensitive extracts

located in ‘wet’ rooms

respond automatically

to changes in relative

humidity, opening and closing to meet

demand, working in harmony with the fan to

boost individual room extraction.

Other components

For air inlets, terminals, and ducting, see the

Components section on page 58.

System installation


system.

Individual house Apartments: individual systems

Typical iMEV Whole-House ventilation systems

Bathroom

Kitchen

Kitchen

Kitchen Bathroom

Bathroom

Extract fanExtract fan

Extract fan

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Apartments: multiple system

Multi-occupancy: nursing homes, student accomodation, hotels etc

Description

Extraction ventilation is driven by a

continuously-running central DC extract fan

connected to extracts located in the ‘wet’

rooms. Ventilation is boosted by the wider

opening of the extracts, which can provide

either automatic or manual boosts.

Passivent AV is eminently suitable for

apartments, where a single system can

ventilate several apartments, and for student

accommodation, hotels and care and nursing

homes.

The system is specially designed for efficient

extraction of low volumes of air along

lengthy ducts.

The use of one system for several dwellings

can reduce running costs and energy

consumption per dwelling. It also minimises

the number of roof penetrations required.

BBA approved

Passivent AV Whole-House systems are

covered by BBA (British Board of Agrément)

Certificate No 96/3273.

System components

Extract fan A151DC

Low-wattage DC central extract fan for

efficient extraction of air along lengthy duct

runs.

Extracts

All extracts are for ceiling or wall-mounting

in wet rooms. Boost is provided by wider

opening of the vents, controlled as shown

below.

● Humidity-sensitive extracts respond to

room humidity automatically.

● Timed electrical boost is activated

manually and operates for a preset time.

● Constant volume extracts are self-

regulating to maintain a constant extract

rate.

● PIR (passive infrared) boost is activated

when a person is detected in the room,

and operates for a preset time.

The range of extracts enables the whole

design and ventilation strategy to be tailored

to individual room requirements and use.

Other components

For air inlets, terminals, ducting, see the

Components section page 58.

Kitchen

Kitchen Bathroom

Bathroom

Ensuite

bathroom

Ensuite

bathroom

Typical AV Whole-House ventilation systems

PASSIVENT AV

Bedroom

Bedroom

Corridor

Corridor

Extract fan

Extract fan

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