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CI/SfB (57)Uniclass Pr_65_67_29February 2016

iMEVINTELLIGENT MECHANICAL EXTRACT VENTILATION

Contents

Passivent iMEV - intelligent Mechanical Extract Ventilation 3

Passivent iMEV systems

Need for ventilation 4

How traditional MEV works 4

System selection 5

Passivent iMEV Local 6

Passivent iMEV Total 7

Key components

Fans 8

Air extracts 9

Supply air 10

Ducting and terminals 11

Further information 12

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iMEV INTELLIGENT MECHANICAL EXTRACT VENTILATION

Whole-house ventilationPassivent intelligent Mechanical ExtractVentilation (iMEV) offers effective whole-house ventilation for residential and similarbuildings.

● Energy savingsAll Passivent iMEV systems use constantlyrunning low-power fans which reduceenergy bills and the carbon footprint ofthe building.

● Demand controlSystems automatically respond to the needfor ventilation, increasing effectivenessand energy efficiency.

● Complete solutionsEvery Passivent iMEV system provides acomplete ventilation solution which isindividually tailored to a particular projectby our expert design team.

● FlexibleOur flexible range of systems is suitablefor a wide variety of projects, no matterthe type of usage. They can be installed insingle houses and apartments; multi-occupancy dwellings such as care homes,student accommodation and hotels;changing rooms and toilet blocks.

● CompliantAll our iMEV systems are compliant withBuilding Regulations Part F for Englandand Wales and Building Standards Section 3 for Scotland.

● Positive airflow directionThe design of the air circulation meansthat all parts of the property are properlyventilated. The positions of the inlets andextracts ensure that air always moves fromdry rooms to wet rooms, where it isextracted.

● DiscreetWith their compact size and quiet motorsall our fans can easily be placed within acupboard or roof space.

● Simple installationFull fitting instructions are supplied withevery system, with additional technicalsupport if required.

● Long lifeWe recommend fitting by one of ourtrained MasterCare installers. Systems are available with a 12 year designwarranty upon request.

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Need for ventilationEveryday activities such as cooking andbathing, and even breathing, can causeinternal humidity levels to rise. Withoutventilation this stale air has no way to beremoved, trapping potential pollutants andcausing a stuffy unpleasant atmosphere.

How traditional MEV worksA typical traditional MEV system works bydrawing this moist stale air from ‘wet’ roomssuch as kitchens and bathrooms, throughducts via a central fan and exhausting itthrough a roof-mounted terminal.Extraction happens at all times due to thecontinuously running fan.

To ensure the moist stale air is replaced,through-wall and window vents allow freshair from outside to enter. These vents aretypically placed within habitable rooms suchas living rooms and bedrooms.

This cycle of stale air out and fresh air inensures good indoor air quality and a freshclean environment. Importantly, it alsoremoves moisture which can otherwise leadto damp and mould.

Shortcomings of traditional MEV Traditional MEV systems rely on occupantsto recognise the need for increasedventilation and use a manual switch toincrease extraction when required. There are a number of issues with this thatcan lead to over- or under-ventilation andincreased energy costs:

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Energy use ofventilation systems in

a typical three-bedroom house

(based on CIBSE data)

- Users can forget to boost the systemwhich means moist stale air is not removedeffectively.

- When the system is boosted, extraction is increased in all wet rooms, leading tounnecessary heat loss.

- Fan speed can be increased for longerperiods than required, leading to higherenergy usage.

Passivent iMEVPassivent iMEV is ‘intelligent’, in that itremoves the need for any occupantinteraction, automatically detecting rises inhumidity and responding accordingly.

The system only increases extraction whenrequired, so it uses much less energy as thecentral fan is not running at a higher speedunnecessarily. Heat loss is also reduced asiMEV relies on demand control (extractionwhen and where required); extraction is onlyincreased in the areas where humidity hasrisen. Alternatively, extraction control can bevia PIR activation based on occupancy levelsallowing automatic energy saving intelligentcontrol.

This has many additional benefits including:

● Lower energy usage due to lower overallfan speeds.

● Fit and forget solution, as rate ofventilation is not controlled by the user.

● No switches to worry about as the systemprovides efficient whole-house ventilationat all times.

0 100 200 300 400 500 600 700 800 900 1000 1100 1200

Energy consumption (kWh)

TRADITIONAL MEV

PIV

EXTRACT FANS

DEMAND CONTROLLED MEV

Fan powerconsumption

32% energy savingsusing iMEV comparedto traditional MEV

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Passivent iMEV LocalA constant speed fan providescontinuous low level extraction.

Extraction is boosted automatically inrooms where needed by means ofhumidity-sensitive extracts in each wetroom (bathroom, kitchen etc), i.e.locally to the source of humidity.

Main applicationsIndividual houses, apartments with onesystem per flat.

Passivent iMEV TotalAutomatically controlled by humidity-sensitive extracts locally in wet rooms(kitchens, bathrooms etc), plus a fanpressure sensor which maintains theoverall system pressure by adjusting thefan speed. This increases extraction inthe area(s) where required, whilstkeeping a sufficient level of ventilationin other rooms. At night time whenthere is low humidity and low demandthe fan speed reduces to the quietestminimum setting. This provides asystem of total control.

Main applicationsMulti-occupancy buildings such as carehomes, student accommodation andhotels where individual rooms mayrequire different extraction rates.

System selectionPassivent offer two main types of iMEVsystem to support the whole-houseventilation requirements of any dwelling.Whilst both are based on the sameprinciples, each system has features whichare particularly suited to the needs ofdifferent types of project.

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Exhaust terminal

125mm rigidducting

A151DC W CP FanHumidity-sensitiveextract

125mm rigid ducting

Exhaust terminal

Bathroom plenum

Humidity-sensitive extract

A151DC G Fan

Kitchen plenum

Humidity-sensitiveextract

SRD75 Semi rigid ducting

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An intelligent mechanical extract system toprovide effective whole building ventilationwith low energy costs and automatic controlof operation.

UsesIndividual houses, apartments with one fanunit per flat, care homes and studentaccommodation.

Key benefits● Constant fan speed means lower energycosts.

● Local automatic control keeps systemworking as it should – extracting at high levels where needed.

● Quiet fan means less occupantdisturbance.

How it worksThe system uses a low power constant-speedfan, discreetly installed in a roof space orcupboard. Humidity-sensitive extractslocated in wet rooms remove moisture-laden air.

iMEV LocalVentilation automatically matches demand in individualwet rooms using humidity-sensitive extracts. Total extraction rate for the building is constant,avoiding over-ventilation (example scenario only).

Kitchen Bathroom En-suite

Normal Normal Normal

Boost Normal Normal

Boost Boost Normal

You’re at workand the kidsare at school

- home isunoccupied

You’re homefrom work andstart cooking

dinner

Dinner iscooking

whilst it’sbathtime for

the kids

Extract fan in roofspace or cupboardcommissioned atfixed speed

WET Bathroom

WET Kitchen

DRY Bedroom

DRYLiving room

FAN

Air circulation provides whole-house ventilation

Fresh air inlet

Fresh air inlet

Humiditysensitiveextracts inwet roomsadjust tomeet roomdemand

As humidity increases in a wet room, thehumidity-sensitive extract within that roomopens to allow more air to be extracted. Thefan speed remains constant, so at the sametime the extraction rate in other(unoccupied) areas decreases, maintainingthe overall system extraction rate.

Fresh air is provided by either through-wallor window tricklevents. Humidity sensitiveversions are available which operateautomatically.

Acoustic options for these inlets can reducenoise ingress.

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A constant pressure system is ideally suitedto provide effective ventilation for largerbuildings.

UsesPremises where individual spaces mayrequire different controlled extraction rates,such as large dwellings, care homes orstudent accommodation.

Key benefits● Fully automatic control maintainseffective ventilation throughout abuilding.

● Ventilation is tailored to the needs ofindividual rooms or spaces.

● Zonal control minimises heat loss fromareas where additional extraction is notrequired.

● Quiet fan that reduces speed at nighteliminates occupant disturbance.

How it worksThe system uses constant pressure andhumidity-sensitive extracts which controlthe extraction rate in different areasaccording to need.

iMEV TotalVentilation automatically matches demand in individualwet rooms using humidity-sensitive extracts. Total extraction rate for the building is variable, avoiding over-ventilation (example scenario only).

Communal Lounge/ En-suite 1 En-suite 2Servery

Normal Boost Boost

Normal Normal Normal

Boost Normal Normal

Residents are waking up and using

bathrooms

Generalactivity

time

Mealtimewhen

food is beingprepared and

eaten

Night time allasleep

WET Bathroom

WET Kitchen/Servery

DRY Bedroom

WET Bathroom

DRY Bedroom

DRYLounge

Air circulation provides whole-house ventilation

Extract fan in roof space or cupboard,varying speed on demand

FAN

Fresh air inlets in habitable/dry rooms Humidity-sensitiveextract in wet roomsadjust to meet roomdemand

A sensor in the fan monitors the pressurewithin the system. As humidity increases inone area the humidity-sensitive extractopens; the pressure sensor detects theresulting pressure drop and increases the fanspeed to bring the overall system pressureback to the preset level.

This operation increases extraction only inthe area(s) where it is required, whilstmaintaining a sufficient level of extraction inother rooms.

This provides a guaranteed performance,unlike other constant pressure systemswhich are based on the fan performance.

Air extract

Humidity level

Air pressure

Normal Increased Humidity returninghumidity to normal

Fan speed

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iMEV KEY COMPONENTS

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A151DC E fanMain uses: Passivent iMEV Local andstandard MEV

Capacity: 350m3/hr @ 120Pa

The A151DC E fan incorporates one of thelowest energy motors on the market, despiteit being one of the most powerful. It can becommissioned as fixed speed or with amanual boost control that can be easilycommissioned during installation.

For MEV systems, the controller options areeither a three-position switch or remoteradio frequency controller with threesettings: low, medium and boost, as well as atimer, meaning the occupant has full controlof the ventilation in the home.

Key features● To further enhance occupier comfort thefan is fitted with an internal silencer,reducing mechanical noise and allowingthe fan to be placed within a cupboardspace near habitable rooms.

● The A151DC E is eligible for energy usecalculations under Appendix Q of SAP(Standard Assessment Procedure forEnergy Rating of Dwellings) and has aSpecific Fan Power as low as 0.17W/l/s.

A151DC G fanMain use: Passivent iMEV Local with semi-rigid ducting system

Capacity: 275m3/hr @ 120Pa

The A151DC G is the most flexible fan weoffer for single homes and apartments (onefan per dwelling), providing the perfectbalance of size and power.

Designed with a flat pressure curve to beused with humidity-sensitive extracts as partof a Passivent iMEV Local system.

It typically utilises Passivent’s SRD75 semi-rigid ducting, helping to reduce installationtime by 50%.

Key Features● Eligible for energy use calculations under Appendix Q of SAP (StandardAssessment Procedure for Energy Rating of Dwellings).

● Energy efficient.

● Can be mounted in various differentprofiles eg on the floor, wall or ceiling.

● Spigot orientation can be changed foreven more installation possibilities.

● Rear facing fan blades improve acousticperformance, and reduce air resistancewhich will improve longevity.

● Flat fan curve to mimic a small constantpressure system.

A151DC W CP fan (constant pressure)A151DC W fan Main use: Passivent iMEV Total

Capacity: 350m3/hr @ 120Pa

The A151DC W fan is perfect for large multi-residential properties which requireindividual areas to be monitored andventilated separately, without the need foroccupant involvement. The constant pressure version is designed tobe used with humidity-sensitive extracts aspart of a Passivent iMEV Total system.

Its compact size and range of fixing positionsmeans it can be concealed within a roof orcupboard space, with one fan servingmultiple dwellings. This fan is especiallyuseful for care homes and studentaccommodation where extraction may needto increase in different areas at differenttimes, without affecting other areas whereadditional ventilation is not required.

Key features● Energy efficient.

● Can be mounted in various differentprofiles eg on the floor, wall or ceiling.

● Spigot orientation can be changed foreven more installation possibilities.

● Fan blade orientation improves acousticperformance and reduces air resistancewhich improves longevity.

● Constant pressure version features amalfunction warning light to easilyidentify issues with individual units whenmultiple fans are used. Great for carehomes where multiple fan units may beclustered together.

It is important tochoose the right fanfor a project. The descriptionsshown indicate themain uses for each fantype, but Passiventcan advise on themost suitable for anygiven project.

Model Airflow performance (m³/hr) @ 80Pa Typical applicationsNormal Boost

A121 15 - 75 - Bathroom, kitchen/utilityA133 20 - 75 30 mins @ 150 Bathroom, kitchen/utilityA133C 20 - 75 constant @ 150 Bathroom, kitchen/utilityA133SH 10 - 45 30 mins @ 90 Bathroom, en suite

A141E 25 30 mins @ 90 Bathroom, kitchenA141EWC 15 30 mins @ 30 WC, storeA142E 25 30 mins @ 120 Bathroom, kitchen/utilityA142C 20 constant @ 120 Bathroom, kitchen

A141PIR 15 30 mins @ 65 Bathroom, kitchen/utilityA141PIRWC 15 30 mins @ 30 WC

A141/15 15 - StoreA141/30 30 - WCA141/45 45 - WCA141/60 60 - Bathroom, kitchen

A132 Use with A133, A133SH, A141E, A142EA134 Use with A133C, A142C

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iMEV KEY COMPONENTS

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Automatic humidity-sensitive, some withswitched boostUsed to provide fully automatic extractionbased on humidity levels within wet rooms(kitchens and bathrooms). Can also be boostedby the user if additional extraction is required(switch located in the vicinity causes extract toopen further, increasing the level of extraction).Suitable for use within residential and caremulti-occupancy buildings where individualusers may be unable to control the systemeffectively.

Constant volume with switched boostThe A141E is particularly suited as part of adwelling house ventilation solution whereby aconstant level of ventilation is wanted for themajority of the time, whilst still offeringoccupants the option to boost ventilation.

Constant volume with passive infra-red boostProvides constant extraction at a relatively lowlevel but boosts automatically for 30 minutes upon detecting a presence withinthe room. This is has added advantages withinbathrooms as it can be used to tackle odour aswell as humidity.

Constant volumeExtract is set at a constant level so extraction isalways the same. Increased extraction isregulated by fan speed rather than the extractitself. Suitable for when similar levels ofextraction are always required (kitchens, storerooms).

Boost switch (timed for 30 minutes)Constant boost switch

Passivent have a wide range of extractoptions available for use in the differentapplications. They are located in wet roomssuch as bathrooms, WCs and kitchens.

Each extract provides a level of control thatis suitable for the room and activity at anytime. Each room has different requirementsfrom the ventilation system; Passiventprovides a truly adaptive solution for each.

For example, a WC is notpermanently occupied and sodoes not need such a highlevel of permanent extraction.However, once occupied aboost rate is required.

Extract type

A121 A141 PIR

Supply airWhen using mechanical extract systems,fresh air vents must be provided to replacethe extracted air.

Inlet vents are usually located withinhabitable rooms such as living rooms,bedrooms etc.

Passivent have various inlet vent optionsavailable to provide sufficient levels ofbackground air but at the same time ensurethat resident comfort is maintained.

Benefits● Supply of sufficient fresh air.

● Controlled air distribution so do not causedraughts.

● Automatic humidity-sensitive control ifrequired.

● Acoustic vents minimise noise ingress.

ComfortPassivent window and wall vents aredesigned to direct air flow around theoutside of the room and not into theoccupied areas. This stops draughts but alsoallows the fresh air to mix with the warm airfrom the central heating, creatingcomfortable conditions.

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iMEV KEY COMPONENTS

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Window ventsThese are incorporated within the head ofthe window. There are various types availablewith different controls, from manual cordoperated units to fully automatic humidity-sensitive versions.

These units are usually installed by thewindow manufacturer at the time of makingthe windows. Each is designed to ensurethat airflow is not directed into the centre ofthe room which residents mainly occupy, butis directed upwards, reducing the effect ofdraughts.

There are also acoustic options includingeither manual or automatic control. Thesecan give sound reduction of up to42dB Dn,e,w providing a quieter, peacefulliving environment.

Wall ventsA range of through-wall vents is alsoavailable, which can be used where it is notpossible or desirable to fit a window vent orwhere a greater control of supply air isrequired.

Wall vents are infinitely adjustable betweenopen and closed, so allow close control ofhow much air is allowed in.

Humidity-sensitive options are also availablewhere manual control is not required.

The acoustic range can also providesubstantial sound reduction of up to 50dB Dn,e,w.

TLF vent

Energy saver vent (ES4)

Fresh ALdB

Fresh TLFdB

Terminal Duct/spigot diameter Air flow performance

Versa-Tile TT9 125mm 50m³/hr at 1.1Pa

100m³/hr at 4.1Pa

200m³/hr at 16.8Pa

Versa-Tile TT13 150mm 50m³/hr at 0.3Pa

100m³/hr at 1.0Pa

200m³/hr at 4.2Pa

300m³/hr at 9.5Pa

500m³/hr at 27.4Pa

Ridge PRT 125mm 50m³/hr at 2.1Pa

100m³/hr at 7.0Pa

200m³/hr at 25.1Pa

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iMEV KEY COMPONENTS

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DUCTING

Plastic rigid circular ductingCan be used to connect all parts of aPassivent system including extract to fanand fan to roof terminals. Available with anumber of different connection pieces tonavigate different project layouts. Insulationis available to prevent heat loss,condensation and provide resistance to fire.

Plastic rigid flat channel ductingFlat channel ducting is suitable forextraction from wet rooms such asbathrooms and kitchens (including cookerhoods). Its low profile enables ducting to beconcealed. The various different types ofducting available mean that it can easily beincorporated into different types of project.

SRD75 semi-rigid ductingSRD75 semi-rigid ducting provides a flexibleoption to connect the central fan to theextracts. Its construction allows it to bendaround obstacles without the need foradditional joints. Supplied in 50m lengths itcan be cut to accommodate single ductingruns, reducing the chance of air leakage andcutting installation times.

Benefits● Can reduce installation time by up to 50%.

● Allows for installation between narrowlyspaced joists and within stud walls.

● No air leakage as joints are not usuallyrequired.

● Suffers very little pressure loss comparedto flexible ducting.

● Ductwork can easily be cleaned.

Easier installationThe ducting is cut on site so each duct canbe run as a single length; joints and separatebends are not usually required. Thusinstallation is quicker and more efficient.

TERMINALS

Exhaust air terminalsTile and ridge terminals are designed toblend with most available manufacturers’roof tiles, and to weather to match thesurrounding tiles over time. They have an AA fire rating to BS 476: Part 3.

Wall terminals are also available.

Semi-rigid ducting

FURTHER INFORMATION

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PASSIVENT LIMITEDNorth Frith Oasts, Ashes Lane, Hadlow, Kent TN11 9QU Tel: 01732 850770 Fax: 01732 850949

Email: projects@passivent.com Web: www.passivent.com

Passivent Limited maintains a policy of continuous development and reserves theright to amend product specifications without notice.

A division of Building Product Design Ltd. Company Registration No: 3944123

ServicesPassivent has its own in-house researchteam dedicated to developing techniques and products for natural ventilation, and is a leading partner in some of the mostimportant research projects in this fieldincluding NatVent™, a consortium ofEuropean organisations headed by BRE.

We offer a comprehensive design andadvisory service tailored to your specificproject, covering both natural ventilationdesign and product selection. AdvancedAirsoftTM software based on CIBSE AM10 isused to calculate sizes of air inlets andoutlets on commercial projects to achieveoptimum performance.

InstallationInstallation and commissioning servicethrough an independent network ofPassivent MasterCare installers. Design warranty available upon request.

Names of approved installers can be provided upon request.

Quality assurancePassivent products are designed, developedand manufactured under a BS EN ISO 9001quality management system, giving anindependently audited assurance that theproducts will fulfil their intended purpose.

EnvironmentPassivent conducts all business processesunder a BS EN ISO 14001 qualitymanagement system, giving an assurancethat all activities are carried out havingminimal impact upon the environment.

Other productsPassivent market a range of other ventilationand daylighting products for commercial anddomestic buildings including:

Natural (passive) ventilation systems

Aircool ventilators for windows, curtainwalling and walls

Airstract roof terminals for passive stack andother natural ventilation systems

Airscoop wind-driven ventilation terminals

Sunstract and Litevent rooflights/ventilators

SoundScoop acoustic transfer

ISO 9001 OHSAS 18001 910124 February 2016 4490