intelligent passive stack ventilation: domestic systems · 2017-05-22 · contents ispv - the...

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CI/SfB (57)Uniclass L7535April 2011

iPSVTM

INTELLIGENT PASSIVE STACK VENTILATION: DOMESTIC SYSTEMS

Contents

iSPV - The Natural Solution 3

iSPV - The True Story 4 - 5

Building Regulations recognition

Savings with PSV 6

Installed cost / energy savings 6

Combined solutions 6

Carbon dioxide and energy savings 7

Lifetime cost savings 8

How Passive stack ventilation works 9

How iPSV works 10

Background ventilation 11

Systems and components 12 - 14

Design guidance 15

Further information 16


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Passivent iPSV™ is the most sustainable and environmentally-friendlydomestic ventilation strategyavailable.

Passivent iPSV™ - intelligent passive stackventilation - is the most sustainable andenvironmentally-friendly domesticventilation strategy available.

It provides numerous ‘green’ benefitscompared with mechanical ventilation heatrecovery (MVHR) or other mechanicalsystems.

● Meets current building regulationsConfirmed by BBA certification

● Equals or betters the performance ofmechanical systems including heatrecoveryDemand controlled - ventilation rate asrequiredReduces heat lossPerforms effectively even in airtightbuildingsMeets moisture criteria as specified withinregulations

● Uses no powerSaves energyCuts CO2 emissionsSilent operationCan’t be turned off

● Lasts the life of the buildingVirtually no maintenance throughout itslifeNo replacement components needed

● Low lifetime costLow capital cost because there is no fan orheat recovery unit No replacement unit costs Virtually no running costs because nopower used and no maintenance.

● Experience and authorityBacked by Passivent’s unrivalledexperience and proven track recordBenefits are substantiated by independent,authoritative technical studies and assessments.


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Certificate no 96/3273

Building Regulations recognitionEfficient and effective ventilation ismandatory under building regulations formodern airtight dwellings and to meet theincreasingly important need for energyconservation.

Passivent’s iPSV™ solution allows the mostup-to-date ventilation requirements to bemet with ease.

True values of PSV performance are nowrecognised and substantiated by the latestversions of the authoritative documents:

● Approved Document F1 2010 forventilation.

● Approved Document L1A 2010 forconservation of fuel and power in newdwellings.

● The latest SAP 2009 software for assessingenergy performance.

● BBA certification for Passivent iPSV.

● Passivent iPSV can also be used to satisfythe requirements of the relevant buildingregulations in Scotland and NorthernIreland, as stated in the BBA certificate.

Ventilation performanceThe update of Building RegulationsApproved Document F1 Means of Ventilationin October 2010 now recognises theperformance of Passive Stack Ventilation inairtight buildings down to 0m3/h/m2 airleakage rate.

The Institute of Energy and SustainableDevelopment at De Montfort University hasconducted studies into theperformance ofPassivent iPSV whichdemonstrate that thesystem provides sufficient ventilation evenunder challenging or non-optimumconditions.

These studies provide independent proof ofthe performance of the PSV system whichled to its acceptance in Approved Document F1.

Meeting Building RegulationsMeeting building regulations requirementsfor ventilation rates can be difficult inpractice. The BBA approved iPSV systemallows building regulations to be met withease.

To meet building regulations it is required toshow that the dwelling provides levels ofventilation as specified within ApprovedDocument F1. The levels are determined toensure that the moisture content and airquality within the dwelling are below thecriteria specified.

The BBA certificate provides proof that iPSVmeets the requirements for moisturecontent as specified within Appendix A, andensures adequate air quality.

IESD

SAP 2009 software updateAlongside the building regulations updates,SAP calculation software has been updated.SAP 2009 takes into consideration theperformance of passive stack systems inairtight buildings. The SAP software makesallowances for heat loss, use ofsupplementary heating systems and powerusage. Combined, this gives a complete viewof the performance of the system.

Securely based on research, these latestupdates to building regulations and SAPsoftware show the real performance of PSVin ventilating even the most airtight ofproperties.

In summer monthsWhen external temperatures are higher, thePSV stack effect is reduced. Passivent iPSVhas been shown to work effectively even inthese conditions.

The IESD study, conducted between 1st Apriland 30th September, showed that theaverage ventilation rate was 12.1 litres persecond, meeting regulations. It also showedthe lowest average levels of relativehumidity.

In wet rooms with no external wall orwindowPassivent iPSV ventilates through ceilingextracts via ducting to the roof, so access toan external wall or window is not needed.

The IESD study, conducted between 1st Apriland 30th September, which showed that theaverage ventilation rate was 12.1 litres persecond was modelled on an internal wetroom with no windows, with a designed airtightness of 3m3/hr/m2.

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5

Technical backgroundVentilation of a dwelling Required to meet the Building Regulations Part F (Approved Document F1).

Ventilation strategy is also a factor in meeting Part L for conservation of fuel and power (ApprovedDocument L1A for new dwellings).

Standard Assessment Procedure SAP is used to assess the energy performance of dwellings. SAPcalculations are performed by approved software and trained assessors.

SAP indicators include the Dwelling Emission Rate (DER), ie the rate of emission of CO2 inrelation to floor area (kg/m2 per year). Approved Document L1A places limits on permissible DER.

Air permeability Based on air leakage volume rate per hour per m2 of envelope area at a pressuredifferential of 50Pa, and is used in establishing DER. A rate of 2 to 4m3/h/m2 would currently beregarded as ‘good’.

Code for Sustainable Homes (DCLG) Homes are rated from Code level 1 to 6 based on a range ofcriteria including energy use and CO2 emissions, with minimum standards for each code level.These include percentage improvements to DERs over the regulations as calculated by SAP.

Background ventilationThe independent BBA testing andcertification of Passivent iPSV™ shows thatonly one background ventilator per habitableroom is needed to comply with BuildingRegulations, by meeting the criteria forperformance-based ventilation given inApproved Document F Appendix A.

Conventional passive stack systems needseveral vents in each room to provide thenecessary levels of background ventilation,requiring multiple penetrations which areimpractical and unsightly.

Thus iPSV complies with buildingregulations, preserves the aesthetics ofhabitable rooms, and manages moisturelevels and air quality. For more details seepage 11.

No energy use - no CO2 emissionsiPSV needs no input of power, so there areno CO2 emissions as a result of ventilating aproperty. This cannot be said for any otherventilation strategy.

Demand controlledPassivent iPSV is intelligent: extracts openand close in response to humidity levels in‘wet’ rooms, so ventilation rate is matched todemand. When the need for ventilationreduces, the ventilation rate reduces in-line.Heat is conserved by avoiding unnecessaryventilation, so the use of energy for heatingis reduced.

A more than comparable solutioniPSV performance is comparable with orbetter than other ventilation strategies whenassessed through SAP with air leakage ratesto zero, and up to Code Level 6 under theCode for Sustainable Homes.

Combining technologiesBy combining iPSV with other green passivetechnologies for waste heat recovery, SAPscores can be reduced dramatically againstsimilar priced ventilation strategies. Thesame outlay gives better performance, seepage 6.

Lifetime cost savingsNo moving parts ensures that there is nopotential for breakdown and no regularmaintenance is required. The comparisonbetween lifetime costs of iPSV and MVHR(mechanical ventilation with heat recovery)systems shows substantial savings for thebuilding owner over the life of the buildingwith iPSV, see pages 6 and 8.

Unrivalled experience and a proven recordPassivent has unrivalled experience overmany years in the design and installation ofnatural and energy-efficient ventilationsystems - over 30,000 systems have beeninstalled over the last 15 years.


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Installed cost / energy savingsWhen designing and building dwellings,Standard Assessment Procedure (SAP)software is used to calculate the performanceof the building by its energy usage andcarbon emissions. Using iPSV™ can providea SAP score or Dwelling Emission Rate(DER) which is comparable with or evenbetter than mechanical ventilation systemsincluding MVHR (mechanical ventilationwith heat recovery).

The initial cost of a PSV system isdramatically lower than other strategiessuch as MVHR systems. By using iPSV youcan achieve similar, or even better scores.

The table below shows that iPSV and MVHRsystems give virtually the same DER at atypical air leakage rate of 5m3/hr/m2, but thePSV installed cost gives a saving of £1410(70% reduction) compared with MVHR.

Typical installed cost comparison

System Installed cost DER £ @ 5m3/hr/m2

iPSV 590 26.68MVHR 2000 26.70

COMBINED SOLUTIONS

PSV cost trade-offAs an alternative strategy, a PSV combinedsolution costing approximately the same asan MVHR system can give a significantlylower SAP score.

By combining iPSV with other green passivetechnologies the DER can be significantlyreduced compared to an MVHR system, at noextra installed cost.

Moreover the passive solution has norunning or maintenance costs whereas forMVHR these cost are substantial.

Combined solutionsA combined solution uses a PSV system plusFlue Gas Heat Recovery (FGHR) and WasteWater Heat Recovery (WWHR) technologies.These align very well with PSV because theyare also non-mechanical, silent in operation,require no maintenance and last the life ofthe dwelling.

FGHR systems recover heat from boilerexhaust gases (approximately £500 installedcost).

WWHR systems recover heat from wastewater from shower, bath etc (approximately£650 installed cost).

In the example below, for less initial outlaythan a standard MVHR system, a PSVcombined solution achieves a lower DER.

Combined solution comparison

System Installed cost DER£ @ 5m3/hr/m2

PSV combined 1,965 25.97(PSV + GS + SS)

MVHR 2,000 26.70

Renewables - further savingsIn order to reach higher Code Levels,renewable energy sources such asphotovoltaics or solar thermal are often seenas a way of achieving target rates.

The combined solution of iPSV plus Flue Gasand Waste Water Heat recovery technologieshelps to achieve a lower DER, reducing therequirement for renewables and creating alower cost installation that still reaches therequired Code Level.

Lifetime costThe lifetime cost of a PSV Combinedventilation system is much lower than formechanical heat recovery (MVHR).

The PSV combined solution requires noreplacement components over the life of adwelling, whereas a mechanical heatrecovery unit requires replacementapproximately every 10 years.

Lifetime costs for a typical dwelling

Total cost over 30 years£

PSV Combined 1,995(PSV + GS + SS)

MVHR 12,020

NotesCalculations independently undertaken byElmhurst Energy Systems Ltd using SAP2009 approved software.

DER (Dwelling Emission Rate) is calculatedfor typical air leakage rate of 5m3/hr/m2.

MVHR data assumes a heat recovery unitwith SFP 0.5 and efficiency 88%.


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Passivent iPSV™ vs standard PSVBoth Passivent iPSV and standard PSV useno electricity to operate, thus providingenergy savings compared with allmechanical systems.

Passivent iPSV™ vs all other systemsFor typical houses, research carried out bythe Institute of Energy and SustainableDevelopment shows that Passivent iPSVgives the lowest CO2 emissions resultingfrom gas and electricity use compared withother available ventilation systems.

iPSV reduces unnecessary heat loss due toventilation, thus saving on gas use forheating, and reducing carbon emissions.

Since iPSV uses no electrical power, it alsogives savings in electricity use comparedwith fans or mechanical extract systems.

Ventilation systems comparisonAnnual CO2 production from a typicaldwelling using various ventilation solutions

Combined annual CO2 emissions from gasand electricity (all uses)

Annual electrical consumption (kWh) of various ventilation solutions

Passivent iPSV™

StandardPSV

Extract Fans

ContinuousMechanical

Extract

Continuous Mechanical Extract with heat recovery

0

0

125

172

359

Annual carbon emissions (kg CO2) from a dwelling using various ventilation solutions

Passivent iPSV™

Extract Fans

StandardPSV

Continuous Mechanical Extract with heat recovery

Continuous Mechanical

Extract

0 100 200 300 400 500 600 700 800 900 1000Annual carbon emissions (kg CO2)

486

506

708

642

771

73

151

53

GasElectricity

Passivent iPSV also provides significantenergy savings compared with standard PSVwhen heat loss through ventilation is takeninto consideration.

A standard PSV system is extracting all thetime. As a result, house heating is constantlyrequired in cold weather to replace the heatlost in extracted air.

Passivent iPSV only extracts air whenventilation is required - ie when relativehumidity is high. This results in up to 40%saving in heating, and reduces CO2emissions due to ventilation over the year.

Source: BRE study 1997.

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Lifetime savingsPassivent iPSV™ provides significant savingsin equipment replacement costs over the lifeof the system.

A passive stack ventilation system will lastthe planned life of a dwelling (source:Energy Saving Trust and BBA). This isbecause there are no electrical componentsrequiring maintenance and replacement.

With all other ventilation systems, electricalfans are used, which have finite motor livesand will require periodic replacement.Replacements cost money. They also requireenergy to manufacture, so there is anadditional carbon emission factor.

Energy costs of replacementsEach time a replacement fan unit isrequired, energy costs are incurred formanufacturing (high due to productionprocesses), transport towarehouse and then to site,energy for warehousing,installation energy (includinginstaller travel), and disposalof the expired fan unit. All this energy usewill add to carbon emissions every time a fanis replaced.

iPSV has none of these energy costs as itlasts the life of the building. Energy cost forreplacements is zero.

Cumulative costs over 30 years life

All cost figures are in £ at current prices

iPSV MVHR Extract fans MEVInitial costs

Parts 300 1500 90 625Background vents 45 0 140 40Installation 245 500 270 400Total initial costs £590 £2000 £500 £1065

Replacement costsFan motor life n/a 10 years 5 years 5 yearsReplacements required 0 3 no 6 no 6 noReplacement unit cost 0 1000 90 250Installation cost 0 225 270 200Total replacement costs 0 £3675 £2160 £2700

Maintenance costsService cost 0 150 0 100Number of services 0 30 no 0 30 noTotal maintenance costs 0 £4500 0 £3000

Cumulative cost over 30 years £590 £10,175 £2660 £6765

Savings with iPSV 94% 78% 91%

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9

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Passive stack ventilationPassive stack ventilation (PSV) is a whole-house system which ventilates all the roomsin a property effectively, using the concept ofplanned air routes to ensure a fresh, healthyindoor environment.

The passive stack effectPassive stack ventilation (PSV) is drivenprimarily by the natural stack or convectioneffect by which warm air rises.

Warm moisture-laden air from within ahouse rises up ducting by naturalconvection. It travels through the ducting toa roof terminal where it is vented to theoutside.

Wind blowing across the roof providesadditional suction (the venturi effect).

Cooler air outside

Unwanted warm moist air inside

Air rises up the duct by convection, carrying

moisture with it

Air is exhausted throughroof terminals

Warm moistair rises up the

ducts by convection

Wet room (eg bathroom,

shower) with airextract

Dry room (eg bedroom)with air inlet

Wet room (eg kitchen, utility)

with air extract

Dry room (eg living room)with air inlet to providereplacement fresh air

Additional suction fromwind (the venturi effect)

PSV whole-house systemThe siting of inlets and extracts ensures thatair always moves from dry rooms to wetrooms, so that the whole house is ventilatedeffectively.

Moisture-laden air is extracted at sourcedirectly from wet rooms (kitchens,bathrooms etc) .

The air passes through ducting to roofterminals where it is vented to the outside.

No fans are required so no power is used.

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Passivent intelligent PSVPassivent have pioneered an intelligentversion of PSV (iPSV) which respondsautomatically on demand, ie when the levelof humidity in a room requires ventilation.

Standard PSV systems have extract grilleswhich are open continuously and extracteven when humidity is at a low level - whenhigh levels of ventilation are not required.This causes unnecessary heat loss.

Intelligent PSVPassivent iPSV™ is controlled by‘intelligent’ air inlets and extracts. Theserespond automatically to changes in relativehumidity, thereby modulating theventilation rate in each room to meet thevarying need. Ventilation levels are matchedto demand.

● When room humidity is low, theventilation rate is minimised, irrespectiveof external weather conditions, preventingunnecessary heat loss.

● When room humidity is high, theventilation rate increases, removingmoisture rapidly when need is greatest.

● The airflow rate responds continuously todemand, so maximising ventilationeffectiveness and minimising heat lossthrough loss of warm indoor air.

● Ventilation responds to humidity inindividual rooms, so further increasingeffectiveness and minimising heat loss.

● This method of control uses no electricalpower.

Extracts and inletsBoth extract grilles and air inlets use non-electrical humidity-sensitive control. Nylonstrands in each unit expand or contract inresponse to humidity levels. Thisautomatically regulates the size of the airopening and varies the ventilation rateaccordingly.

These diagrams are schematic to show general principles only.

High indoor humidity, high ventilation rate

Wet roomsDry rooms

Wet roomsDry rooms

Intelligent extract fully opento remove moisture-laden air

Stale air vented via passivestack and roof terminal

Air circulation

Air circulation

Intelligent inlet opensaccording to roomhumidity

Low indoor humidity, low ventilation rate

Intelligent extract partly or fullyclosed according to humidity:minimises heat loss

Intelligent inlet partlyor fully closed accordingto room humidity


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Building regulationsBackground ventilation is required inconjunction with an iPSV™ system toprovide whole-dwelling ventilationcomplying with Building RegulationsApproved Document F1.

Passivent window and wall vents providecontrollable ventilation at a relatively lowlevel to meet the regulatory requirements.

Passivent iPSV requires only one backgroundventilator per habitable room to meet theregulations, as shown by BBA testing andcertification.

In contrast a standard PSV system wouldrequire several ventilators per habitableroom, needing multiple unsightlywall/window penetrations. The examplebelow, based on Approved Document Fworked example C shows this.

Features and benefits- Passivent have a comprehensive range of

window vents (Tricklevents) and wallvents (Fresh) to meet most requirements.

- Controllable, secure and designed to avoiddraughts.

- Automatic humidity-controlled options toensure the whole ventilation strategyneeds no user input.

- Acoustic vents provide good soundinsulation for noisy locations, and areavailable as part of a BBA approvedsystem.

- Colour co-ordination: many Passiventwindow vents can be supplied in any RALcolour to match windows.

Passivent background ventilation units

Free area Equivalent Features mm2 area mm2

Through-frame ventsUltra Vent and Grille 4000 2800 Slim profileFrame Vent and Canopy Grille 4000 3120 Manual opening, 3 positionsEnergy Saver Vent and

Canopy Grille 4000 2760 Humidity-sensitive

Wall ventsFresh 80 4000 2220 Round vent, pull cordFresh 90 6000 2630 Aesthetic vent, slide controlFresh 100 6000 3200 Round vent, pull cordFresh 99H 6000 3350 Square vent, pull cord

Ventilation area is defined by building regulations in term of ‘equivalent area’ (England andWales) or ‘free area’ (remainder of UK and Ireland).

‘Free area’ is simply the size of the ventilation aperture.

‘Equivalent area’ provides a measure of the actual airflow performance of the vent and isdetermined by the method of BS EN 13141-1: 2004.

Standard PSV: Typical dwelling: 4 habitable rooms (1 living, 3 bed), 3 wet rooms, total floor area 84m2

Air tightness greater than 5m3/hr/m2

Total equivalent area required by Approved Document F 60 000mm2

PSV equivalent area (3000mm2 per stack) 9000mm2

Remaining requirement 51 000mm2

Requirement per habitable room 51 000 ÷ 4 12 750mm2

Number of trickle vents per habitable room at 4000mm2 per vent Four

Passivent iPSV requires only one trickle vent per habitable room compared to four as detailed above


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Passivent iPSV™ systems

A complete Passivent iPSV™ systemcomprises:;

- Humidity-sensitive extracts in each wetroom (eg kitchen, bathroom, utility)connected to ducting and a roof terminal

- Humidity-sensitive air inlets in each dryroom (eg living and dining rooms,bedrooms).

A161

PRT

X332

F12524

X332

MC01

X332

F12513

X332

A161

PRT

X332

F12524

FCA4

FCA6

FCD1

FCA3

FCD1

FCA6

X332 X332

X332

A161

F12513

X332

TT9

X332

F12524

MC01

A161

TT9

X332

F12524

FCA4

FCA6

FCD1

FCA3

FCD1

FCA6

X332 X332

PRT

X332

F12524

A161

FCA4

FCA6

FCD1

FCA3

FCD1

FCA10

FCA11

TT9

X332

X332

F12524

A161

FCA4

FCA6

FCD1

FCA3

FCD1

FCA10

FCA11

Ceiling extract, circular ducting,ridge terminal

Ceiling extract, flat ducting, ridge terminal

Ceiling extract, circular ducting, tile terminal

Ceiling extract, flat ducting,tile terminal

Wall extract, flat ducting, ridgeterminal

Wall extract, flat ducting, tileterminal

Extract systems for wet roomsGround floor (kitchen, utility, downstairs cloakroom)

ComponentsExtracts are normally ceiling mounted butwall extracts are also available.

Terminals are ideally sited on the ridge, buttile terminals are also available.

Inlets may be window mounted or through-wall.

For ease of installation, flexible ducting isgenerally used in roof spaces whilst rigidducting is used within the living space.

Rigid ducting is circular, or flat channel forrunning within stud partitions etc.

Ducts in roof spaces and other unheatedvoids must be insulated; insulated ducting isavailable for this purpose.

Typical systemsTypical systems suiting most applications areshown.

Where these are not suitable alternativeconfigurations can be supplied.

Extension ducting is available for propertiesover two storeys.

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Component codesCode DescriptionA161 Humidity-sensitive extractF12513 Uninsulated flexible ducting, 3.0mF12524 Insulated flexible ducting, 4.0mFCA3 Flat channel straight connectorFCA4 Flat channel circular connectorFCA6 Flat channel circular adaptorFCA10 Flat channel elbow connectorFCA11 Round pipeFCD1 Flat channel ducting, 1.5mMC01 Sleeve coupling, male 125mmPRT Ridge terminalTT9 Tile terminalTT7 In-Line tile/slate terminalX332 Speed clamp

Air inlets for dry roomsHumidity-sensitive air inlets (window orwall) form a part of the iPSV system,providing fresh air in response to demand.

Background ventilation, provided bymanually-controlled window or wall vents,is also required .

Features and benefits● Automatic humidity control

● Efficient in operation

● Protection: inlets are designed toprovide security, [adjustability],avoidance of discomfort due to colddraughts and prevention of rain ingress.

● Can be adjusted to provide backgroundtrickle ventilation even when closed.

● Acoustic wall inlets are availableproviding good sound insulation fornoisy locations.

● Window inlets can be supplied coated inany RAL colour to match windows.

PRT

X332

F12524

A161

X332

TT9

X332

F12524

A161

X332

TT7

X332

F12524

A161

X332

Ceiling extract, In-Line tile/slateterminal. Not suitable for kitchens

Ceiling extract, tile terminal

Ceiling extract, ridge terminal

First floor (bathroom, shower room etc)

Fresh 99HdBAcoustic humidity-sensitivewall inlet

A101+PVCG4Humidity-sensitive window inlet plus externalcanopy grille

A111+PV250Humidity-sensitive wall inlet plus airbrick andtelescopic sleeve

Fresh 99HHumidity-sensitivewall inlet

A111+PV250DBAcoustic humidity-sensitive wall inlet plus airbrick andacoustic telescopic sleeve


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SYSTEMS AND COMPONENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A161 Humidity sensitive extractNormally ceiling-mounted. Wall-mounted optionavailable.

Air extracts TerminalsThere is a range of terminals to suit pitchedand flat roofs.

Ridge terminals are usually recommendedwhere possible, but tile terminals can beused instead where necessary.

Ridge terminals

Tile/slate terminals

Ducting

FCD1 flat channel ducting

R1251 rigid uninsulated ducting

F12524M flexible insulated ducting

F12513M flexible uninsulated ducting

In-Line terminals

BenefitsAA fire rated as standard.Can be matched to most tile manufacturerprofiles.Can be colour matched to any RAL colour.Unobtrusive - Smallest design available forairflow capacity.Condensation trap feature preventscondensation running back down duct.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DESIGN GUIDANCE

Passivent Limited offers a design service foriPSV™ systems based on building drawingsupplied.

Design pointsMain design points are given below.The layout shown is schematic and actualinstallations may differ in detail.Designs should also follow the guidancegiven in Approved document F1 Table 5.2b.

Design guidesA number of independently producedguidance documents make recommendationsfor the installation of PSV or intelligent PSV.

PP3/99 Sustainable Homes: EmbodiedEnergy in Residential Property ManagementPublished by BRE, Housing Corporation andHastoe Housing Association

Specification clause

Ventilation to be providedby means of a BBAcertified whole-houseintelligent passive stackventilation systemcomplying with:Building Regulations(England and Wales)Approved Document F*

Building (Scotland)Regulations TechnicalHandbook DomesticSection 3*Building Regulations(Northern IrelandTechnical Booklet K*Building Regulations(Republic of Ireland)Technical GuidanceDocuments Part F*

The ventilation system tobe Passivent iPSV™whole-house systemcovered by BBA certificate96/3273, supplied byPassivent Limited, 2 Brooklands Road, Sale,Cheshire M33 3SS,telephone: 0161 905 5700,fax: 0161 969 5346, email:[email protected].

Design and layout of thesystem to be in accordancewith the manufacturer’srecommendations.Installation to be inaccordance with themanufacturer’sinstructions and any otherdesign recommendationssupplied, and to be carriedout by a PassiventMastercare trainedinstaller holding a currentMastercare certificate.

*Select as appropriate

Site air inlets ineach habitable dryroom (living room,bedrooms etc)

Best practice guidelines state:- Design for long life (at least 60 years andpreferably more).- Do not install ultra-high-tech equipmentthat offers only marginal energy savings in use.- Avoid systems with high maintenancerequirements or which need frequentreplacement.- Avoid systems which rely heavily on userregulation to achieve energy savings (eg useintelligent self-regulating passive stackventilation rather than user-controlledsystems).

Passivent iPSV™ meets all these criteria.

BRE Information paper IP13/94 PassiveStack Ventilation Systems: Design andInstallationProvides information and guidance regardingthe design and installation of PSV systems.

Design information is also given in BBA Certificate 96/3273.

Habitable room(eg bedroom)

Wet room (eg bathroom)

Habitable room (eg living room)

Wet room (eg kitchen)

Terminals must be no morethan 0.5 metre down

from the ridge

Each ductmust run toa separateterminal

Ducts must rise vertically or near-vertically, preferably not more than 45° from vertical with a maximum of two bends

Use insulated ducting in the roof void

and other unheated spaces

Support flexible

ducting every 300mm to

prevent sagging

Within the building, run circularducting in a room corner or insidea fitted cupboard or wardrobe.Alternatively run flat channelducting within a stud partition.

There is usually sufficientair flow around internal

doors to provide a flow ofreplacement air. If this is

insufficient a doorundercut of 10mm or an

air transfer door grilleshould be used.

Air flow from dry towet rooms

Site air extracts in each wetroom (kitchen, bathroom)


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FURTHER INFORMATION

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Prod

uced

by

Ted

Has

ting

s/R

ackl

ey D

esig

n. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PASSIVENT LIMITED2 Brooklands Road, Sale, Cheshire M33 3SS Tel: 0161-905 5700 Fax: 0161-905 2085

Email: [email protected] Web: www.passivent.com

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

A member of the Building Product Design Group

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Mastercare™ Installer schemeWe recommend that installation is carried outby a specialist Passivent Mastercare Installer.The Mastercare scheme, operated by PassiventLimited, comprises well-established andreputable companies who have been fullytrained and assessed by Passivent Limited toinstall any Passivent system in both new buildand refurbishment projects.

Mastercare provides:

● Assurance that work is carried out bytrained and experienced installers who arefamiliar with the systems.

● Quality installations.

● Compliance with relevant codes of practice.

● Competitive cost.

All Passivent Mastercare Installers hold acertificate from Passivent Limited. They areregularly monitored to ensurestandards of workare maintained, andalso receive fulltechnical supportfrom PassiventLimited.

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 environmentalmanagement system, giving an assurance thatall activities are carried out having minimalimpact on the environment.

Other productsPassivent market a range of other ventilationsolutions for domestic buildings including:

iHybrid: intelligent hybrid ventilation

iMEV: intelligent mechanical extractventilation

Intellivent: decentralised mechanical extractventilation

iHR: intelligent heat recovery ventilation

Background ventilation: full range of wall andwindow vents

Acoustic ventilation