INTELLIGENT MECHANICAL EXTRACT VENTILATION - …

1 CI/SfB (57)Uniclass Pr_65_67_29 February 2016iMEVINTELLIGENT MECHANICAL EXTRACT VENTILATIONC ontentsPassivent iMEV - INTELLIGENT MECHANICAL EXTRACT Ventilation3 PassiventiMEV systemsNeed for ventilation4 How traditional MEV works4 System selection5 Passivent iMEV Local6 Passivent iMEV Total7 Key componentsFans8 Air extracts9 Supply air10 Ducting and terminals11 Further information12..3..iMEV - INTELLIGENT MECHANICAL EXTRACT VENTILATIONiMEV INTELLIGENT MECHANICAL EXTRACT VENTILATIONW hole-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.

2 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.

3 PASSIVENT iMEV SYSTEMS.. 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 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 of traditional MEV Traditional MEV systems rely on occupantsto recognise the need for increasedventilation and use a manual switch toincrease extraction when required.

4 There are a number of issues with this thatcan lead to over- or under- VENTILATION andincreased energy costs:12.. iMEV INTELLIGENT MECHANICAL EXTRACT VENTILATIONE nergy use ofventilation systems ina typical three-bedroom house (based on CIBSE data)- Users can forget to boost the systemwhich means moist stale air is not When the system is boosted, extraction is increased in all wet rooms, leading tounnecessary heat Fan speed can be increased for longerperiods than required, leading to higherenergy iMEVP assivent 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 has many additional benefits including: Lower energy usage due to lower overallfan speeds.

5 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 200300400500600700800900100011001200 Energy consumption (kWh)TRADITIONAL MEVPIVEXTRACT FANSDEMAND CONTROLLED MEVFan powerconsumption32% energy savingsusing iMEV comparedto traditional MEV5..PassiventiMEV LocalA constant speed fan providescontinuous low level is boosted automatically inrooms where needed by means ofhumidity-sensitive extracts in each wetroom (bathroom, kitchen etc), to the source of applicationsIndividual houses, apartments with onesystem per 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.

6 This provides asystem of total 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 both are based on the sameprinciples, each system has features whichare particularly suited to the needs ofdifferent types of ..Exhaust terminal125mm rigidductingA151DC W CP FanHumidity-sensitiveextract125mm rigid ductingExhaust terminalBathroom plenumHumidity-sensitive extractA151DC G FanKitchen plenumHumidity-sensitiveextractSRD75 Semi rigid ducting..6..PASSIVENT iMEV LOCALAn INTELLIGENT MECHANICAL EXTRACT system toprovide effective whole building ventilationwith low energy costs and automatic controlof houses, apartments with one fanunit per flat, care homes and benefits Constant fan speed means lower energycosts. Local automatic control keeps systemworking as it should extracting at high levels where needed.

7 Quiet fan means less 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 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).KitchenBathroomEn-suite NormalNormalNormalBoostNormalNormalBoost BoostNormalYou re at workand the kidsare at school - home isunoccupiedYou re homefrom work andstart cookingdinnerDinner iscookingwhilst it sbathtime forthe kidsExtract fan in roofspace or cupboardcommissioned atfixed speedWET BathroomWET KitchenDRY BedroomDRYL iving roomFANAir circulation provides whole-house ventilationFresh air inlet Fresh air inlet Humiditysensitiveextracts inwet roomsadjust tomeet roomdemandAs humidity increases in a wet room, thehumidity-sensitive EXTRACT within that roomopens to allow more air to be extracted.

8 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 options for these inlets can reducenoise ..iMEV INTELLIGENT MECHANICAL EXTRACT VENTILATION7..PASSIVENT iMEV TOTALA 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 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 it worksThe system uses constant pressureandhumidity-sensitive extracts which controlthe extraction rate in different areasaccording to need.

9 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 1En-suite 2 ServeryNormalBoostBoostNormalNormalNorma lBoostNormalNormalResidents are waking up and usingbathroomsGeneralactivitytimeMealtim ewhenfood is beingprepared andeatenNight time allasleepWET BathroomWET Kitchen/ServeryDRY BedroomWET BathroomDRY BedroomDRYL oungeAir circulation provides whole-house ventilationExtract fan in roof space or cupboard,varying speed on demandFANF resh air inlets in habitable/dry roomsHumidity-sensitiveextract in wet roomsadjust to meet roomdemandA 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.

10 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 extractHumidity levelAir pressureNormal Increased Humidity returninghumidityto normalFan speed2..iMEV INTELLIGENT MECHANICAL EXTRACT VENTILATIONiMEV KEY COMPONENTS..8..FANS..A151DC E fanMain uses: Passivent iMEV Local andstandard MEVC apacity:350m3/hr @ 120 PaThe 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.