Intelligent Air Solutions

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1 Uniclass L75 CI/SfB (57) X HRX-aQSB. May 06 Intelligent Air Solutions QUIET COMPACT EFFICIENT

2 MANUFACTURED IN THE UK Applications Suitable applications Introducing Polypipe s new and highly efficient Silavent HRX-aQ - the most compact and intelligent void mounted MVHR ceiling unit in the market. The HRX-aQ enables contractors to deliver quicker installation with minimum hassle. From 99mm deep, the smallest Silavent MVHR footprint SFP down to 0.66 W(l/s) HE up to 88% Backward curved EC fans, mounted in a high density EPP moulded body, ensures the quietest void mounted MVHR/ERV unit available; operating at a low of db(a) in normal operation. Designed to be one of the smallest footprint MVHR/ERV units on the market, from 99mm in depth, the HRX-aQ allows for easy installation in the tightest of ceiling voids and utility cupboard spaces. See pages -5 Extremely lightweight, weighing from just 7.9kg, the HRX-aQ mounts directly to a slab. Offering a range of efficient fan motors and advanced Polymer heat exchange options, the HRX-aQ delivers Specific Fan Powers (SPF s) as low as 0.66 W(l/s) in a typical installation, with heat exchange efficiencies of up to 88%. Simple to design in Installation made easy Space saving solution See pages 0- Intelligent Air Solutions Hotels Efficient db(a) Whisper quiet Encompassing offset 0x60mm duct connections, makes connection and duct crossover simple. Flats Down to 99mm in depth, the HRX-aQ s discreet profile makes it the perfect ventilation choice for a variety of residential solutions and at the lowest installed cost. Homes Compact Apartments The HRX-aQ ticks all the boxes Offers the lowest installed cost! Quiet MANUFACTURED IN THE UK Integrated intelligent Bluebrain control options optimise the units functionality and performance, to lower Dwelling Emission Rates for a higher SAP rating. Offering wireless and wired control options such as frost protection, temperature and humidity control, auto summer bypass and independent fan speed control, the Bluebrain controller boasts a full host of air quality and commissioning controls for improved indoor air comfort. Student Accommodation Care Homes See pages 6-9 Intelligent Air Solutions

3 Efficient Sound Ultimate performance Whilst the HRX-aQ is the most compact MVHR ceiling unit, its energy efficient performance has not been comprised. Providing Specific Fan Powers as low as 0.66 W/(l/s) and a heat exchange efficiency up to 88%, the unit will efficiently lower Dwelling Emission Rates for a higher SAP rating. Note: Specific Fan Power combined with heat exchange efficiency is how MVHR units are measured and used towards calculating overall system performance. Unit performance By selecting a Total Heat exchanger, rather than a standard heat exchanger, the unit will become an Energy Recovery Ventilation (ERV) system. For Total Heat exchanger performance figures, please vent.marketing@polypipe.com More information available on page 6. 00mm DEEP MODELS AQH00-S / AQH00E-S Pa Volume flow (l /s) AQH0-S / AQH0E-S Pa TYPICAL INSTALLATION 99% 70% 50% % Volume flow (l /s) 99% 70% 50% % AQH00-B / AQH00E-B Pa Volume flow (l /s) AQH0-B / AQH0E-B Pa mm DEEP MODELS 99% 70% 50% % Volume flow (l /s) 99% 70% 50% % SOUND PERFORMANCE CODES SPEED FLOW PRESSURE POWER POSITION SOUND POWER LEVELS SOUND CONTROL RATE (Pa) (W) db re pw PRESSURE SETTING (l/s) m) Test - Duty Points K K K 8K AQH00-S & 99% Breakout AQH00E-S 70% 7 7 Breakout % 8 5 Breakout * % Breakout * AQH00-B & 99% Breakout AQH00E-B 70% Breakout % 5 Breakout % 5 0 Breakout AQH0-S & 99% Breakout AQH0E-S 70% 7 65 Breakout % Breakout % Breakout AQH0-B & 99% Breakout AQH0E-B 70% 7 65 Breakout * % Breakout * % Breakout * * *Noise not normally heard by the human ear. More data listed on pages -5. Code Bypass Kitchen + wetroom Kitchen + wetrooms SFP W/(l/s) SFP W/(l/s) Code Bypass Kitchen + wetroom Kitchen + wetrooms SFP W/(l/s) SFP W/(l/s) Dimensional drawings AQH00-S AQH0-S AQH00-B AQH0-B PRODUCT CHARACTERISTICS TYPICAL INSTALLATION DATABASE (SAP 0) AQH00 models AQH0 models Code Bypass Kitchen + wetroom Kitchen + wetrooms SFP W/(l/s) HE % SFP W/(l/s) HE % AQH00-S AQH00-B Code Bypass Kitchen + wetroom Kitchen + wetrooms SFP W/(l/s) HE % SFP W/(l/s) HE % AQH0-S AQH0-B EXHAUST INTAKE EXTRACT SUPPLY EXHAUST INTAKE EXTRACT SUPPLY 50 PRODUCT CHARACTERISTICS TYPICAL INSTALLATION DATABASE (SAP 009) Code Bypass Kitchen + wetroom Kitchen + wetrooms Code Bypass Kitchen + wetroom Kitchen + wetrooms SFP W/(l/s) HE % SFP W/(l/s) HE % SFP W/(l/s) HE % SFP W/(l/s) HE % 99 9 AQH00-S AQH00-B AQH0-S AQH0-B Measurements in mm Measurements in mm Weight: 7.9Kg (.st) Weight: 8. kg (.st) Intelligent Air Solutions Intelligent Air Solutions 5

4 Energy Recovery Ventilation (ERV) for maximum air comfort and quality How Energy Recovery Ventilation (ERV) works The range of Silavent HRX-aQ MVHR units also offer options which include specialist Total Heat recovery exchangers to further improve air quality and negate the need for a condensation drain. By selecting this heat exchanger, the HRX-aQ will become an Energy Recovery Ventilation (ERV) system, allowing optimal air comfort. What is Energy Recovery Ventilation? Heat that causes a change in temperature in an object is called sensible heat. For example, when an object is heated, its temperature rises as heat is added - this increase in heat is the sensible heat. Similarly, when heat is removed from an object and its temperature falls, the heat removed is also referred to as sensible heat. Without a heat exchanger, exhausted sensible heat in a dwelling would be lost. All pure substances in nature are able to change their state. Solids can become liquids (ice to water) and liquids can become gases (water to vapor) but changes such as these require the addition or removal of heat. The heat that causes these changes is called latent heat i.e. the energy that is used to add or subtract moisture from air. An Energy Recovery Ventilator (ERV) is a type of air-to-air heat exchanger that not only transfers sensible heat but also latent heat. Because both temperature and optimal levels of moisture are transferred, ERVs are considered Total Heat (or total Total Heat recovery exchanger enthalpy) devices. In comparison, a standard Heat Recovery Ventilator (HRV) can only transfer the sensible heat and therefore does not make use of the latent heat. Why select an Energy Recovery Ventilator? Clean, pre-warmed and OPTIMAL levels of moisture are transferred Incoming air is able to harmoniously react with the home environment for greater air comfort Ultimate control and integration Integration of the Bluebrain control ensures the maximum benefits of ERV are felt through simple control. Why Total Heat recovery exchangers are required A relative humidity (RH) of 0-60% is generally considered healthy for a domestic property, however normal household activities and the outside environment can significantly impact how a building performs and its humidity levels. As homes become more air tight, humidity levels and air quality can be negatively impacted; increasing the need for even more advanced ventilation systems. This can also be seen in poorly ventilated and highly populated developments such as apartment blocks and dwellings for communal living, including hotels, care homes and student accommodation. High levels of humidity can cause a build-up of moisture which may lead to health issues for occupants, as well as mould growth and the formation of condensation about the home. HRX-aQ Total Heat heat recovery exchangers are cleverly designed to maintain comfortable indoor moisture levels and prevent these problems from occurring. NOT NEEDED WITH ERV UNITS WINTER EXAMPLE During the colder winter months, the ERV system works in the same way as a HRV system, but has the added advantage of recovering some of the moisture from the extract airstream to avoid drying out the inside air to a level where it could become uncomfortable. SUMMER EXAMPLE During the summer months especially when the outside air is hotter and more humid than the inside air, the intake air transfers some of its sensible (temperature) heat to the colder exhaust air. At the same time, the intake air also transfers some of its moisture to the exhaust airstream. Because of this, the supply air will be cooler and drier than the outside air. INSIDE C db 9 C wb EXTRACT SUPPLY 7 C db C wb Note: wb = wet bulb temperature db = dry bulb temperature INSIDE C db 5 C wb EXTRACT SUPPLY C db 6 C wb OUTSIDE Heat and humidity recovery OUTSIDE - C db - C wb INTAKE EXHAUST 7 C db C wb INTAKE EXHAUST Note: wb = wet bulb temperature db = dry bulb temperature Heat and humidity reduction Odours and contaminants are exhausted Wasted heat and water vapour are extracted via diffusion Removes the need for a condensate drain, reducing installation time and cost! Allows freedom in locating your ERV unit. Note: The moisture always moves from the air stream that is the most humid to the one that is the driest. Moisture key: Optimum The diagram above illustrates how the Total Heat recovery exchanger exhausts odours and contaminants whilst extracting waste heat and water vapour. RH 6 Intelligent Air Solutions Intelligent Air Solutions 7

5 Advanced control Advanced control Increase value/speed (+) Decrease value/speed ( ) The HRX-aQ aims to revolutionise heat recovery by also including features such as wireless control, night time cooling, delay on timer, auto frost protection and intelligent summer bypass. Through advanced AMIE technology (Air Management for Indoor Environments), the Bluebrain controller not only offers simple pre-programmed functions, but also allows for straight forward commissioning. Flexible, intelligent control Commissioning made easier Engineered to include independent speed control, the HRX-aQ Bluebrain control cleverly allows more accurate commissioning through simple speed adjustment buttons. AMIE technology takes the hassle out of commissioning! Incorporates AMIE technology Intelligently manages air conditions Control functions Dirty filter indicator BMS capabilities Digital humidity control aiding homeowner comfort Through advanced AMIE technology, unlike conventional humidity sensors, the HRX-aQ controller will enable occupants to have direct control over managing the humidity levels in their home - to suit personal comfort levels. By accurately measuring air humidity, the HRX-aQ s extract speed automatically changes from background to boost as the level of humidity increases, thereby providing optimal ventilation performance. Advanced bypass control Perfect for night time cooling or during warmer periods, the HRX-aQ controller detects when the air temperature reaches a pre-set level and intelligently activates the bypass mechanism; allowing in cooler, fresh and filtered air. The bypass is also programmable by time, enabling occupants to activate the mechanism Set temperature trigger point (TEMP) Set date and time (DAY) Set humidity trigger point (HUM) Adjust summer bypass (BYPASS) Copy program (COPY) Select and edit program (PROG) Escape function (ESC) Save function (SET) For more details on the control features, please see pages 6-7. Automated filter maintenance and replacement reminders Ease of maintenance and filter replacement is an important consideration when specifying MVHR not only to ensure performance of the unit is maximised and air quality maintained, but also for peace of mind for both the client and occupants. The HRX-aQ Bluebrain control will therefore remove this concern by providing helpful maintenance reminders for cleaning its filters. Building Management Systems (BMS) The HRX-aQ controller is intelligently constructed to be compatible with Building Management Systems. It incorporates volt free contacts for fault and filter cleaning indication on the Building Management System. 8 Intelligent Air Solutions Intelligent Air Solutions 9

6 Easy installation Easy installation - The most compact and versatile unit available! Space in new build developments is of premium importance and a lack of it, is often an issue associated with MVHR installation. 50mm From 99mm Without compromising on efficiency, the HRX-aQ is the most compact unit available and will fit in even the most restrictive ceiling voids. Offset duct makes fitting simple The HRX-aQ has been designed with rectangular socket connections (0x60mm) which enable it to fit directly to Polypipe s 0x60mm Domus rigid ducting. Designed to be the smallest void mounted unit of its type, the HRX-aQ is compact and light enough to be easily installed on a ceiling, leaving space in areas such as utility rooms free for other home appliances, including washing machines and HIU (Heat Interface Units). 80mm To download Installation and Operating instructions, visit Rigid Ducting Direct connection between the unit and duct will make installation much simpler and removes the need for flexible connectors, thereby improving the performance of the HRX-aQ and ensuring no unsightly flexible ducts are required. The offset duct connection of the HRX-aQ also enables easier duct installation with no complicated cross overs. One-man-lift FROM 7.9Kg At less than 8kgs in weight (. stone or the average weight of a one year old child), the HRX-aQ is the lightest MVHR unit on the market and can be easily and quickly lifted by one person with ease. In comparison, many other units will require a minimum two-man-lift, adding on installation time and costs. LIGHTWEIGHT Typical installation Domus air valve or architectural grille in ceiling 0x60mm Domus ducting Easily accessible wiring interface Side view of HRX-aQ, mounted in the ceiling void 0 Intelligent Air Solutions Intelligent Air Solutions

7 Unit overview Hassle free design The diagram below illustrates the underside of the HRX-aQ unit and the components involved. These include a wiring interface, intelligent Bluebrain control, accessible filters, condensate drain fitting, in addition to highlighting the supply and extract sockets. Domus 0x60mm duct Air extracted from wet rooms Fresh air supplied to habitable rooms The diagram below illustrates a domestic two bedroom apartment and how the HRX-aQ and Domus ducting can be easily designed in. Bedroom Bedroom Bluebrain control unit Exhaust of stale air to outside Ensuite Wiring centre interface Condensate trap fitting Intake of fresh air from outside Kitchen / living area Bathroom Key: Maintenance MVHR ceiling unit (AQH00) Easy access filters on both sides of the unit Condensate drain kit (97) The HRX-aQ comes with two filters which should be cleaned on a regular basis using warm soapy water or a vacuum. The exact frequency will determined by the individual living conditions. To order replacement filters, visit vent-spares.polypipe.com Simple to design-in Having removed the added complication of where to site the Silavent HRX-aQ without comprising on valuable storage space, the unit can be designed-in with a straight in-and-out duct run; therefore making the design process much quicker and hassle free. We offer a free design service. To contact our technical team, vent.marketing@polypipe.com Domus extract duct (Supertube 0x60mm) Domus supply duct (Supertube 0x60mm) Domus insulated exhaust duct (Supertube 0x60mm) Domus insulated intake duct (Supertube 0x60mm) Domus supply/extract adjustable air values Ø5 Domus intake/exhaust double airbrick terminals FireBrake intumescent duct connectors Intelligent Air Solutions Intelligent Air Solutions

8 Whisper quiet Whisper quiet One of the most important considerations in modern MVHR design is noise and its impact on a dwelling s occupants. With background (normal) ventilation down to db(a) (typically no louder than a whisper), the HRX-aQ is the quietest Silavent MVHR unit in the market. Manufactured from high density EPP material (expanded 00mm DEEP MODELS polypropylene) for optimum sound reduction, combined with integral flow straighteners for reduced internal resistance, the highly efficient HRX-aQ ensures that break out and induct noise is minimised. Designed to lower noise The inclusion of rectangular socket connections in the unit not only removes the need for flexible duct connectors, but further reduces the likelihood of invasive noise through improved system performance. 0mm DEEP MODELS attenuation solutions For acoustic attenuation within the duct system itself, look to install Domus rigid duct sound attenuators, which lower sound noise by up to 55dB. Additionally, Domus Thermal duct insulation is designed specifically to improve the thermal insulation of rigid ducting. CODES SPEED CONTROL FLOW RATE (l/s) PRESSURE (Pa) POWER (W) POSITION SOUND POWER LEVELS db re pw Test - Duty Points K K K 8K SOUND PRESSURE m) ATTENUATED SOUND PRESSURE m) using: x 5SL- x 5SL- x 5SL CODES SPEED CONTROL FLOW RATE (l/s) PRESSURE (Pa) POWER (W) POSITION SOUND POWER LEVELS db re pw Test - Duty Points K K K 8K SOUND PRESSURE m) ATTENUATED SOUND PRESSURE m) using: x 5SL- x 5SL- x 5SL AQH00-S & AQH00E-S AQH00-B & AQH00E-B 99% Open inlet % Open outlet % Breakout N/A 70% 7 0 Open inlet % 7 0 Open outlet * * % 7 7 Breakout N/A 50% 5 Open inlet * * * % 5 Open outlet * * % 8 5 Breakout * % 5 0 Open inlet * * * * 7 7 * * N/A % 5 0 Open outlet * * % Breakout * N/A 99% Open inlet % Open outlet % Breakout N/A 70% Open inlet % Open outlet % Breakout N/A 50% 5 Open inlet 8 7 * % 5 Open outlet * % 5 Breakout % 5 0 Open inlet * % 5 0 Open outlet * * % 5 0 Breakout N/A AQH0-S & AQH0E-S AQH0-B & AQH0E-B 99% Open inlet % Open outlet % Breakout N/A 70% 7 65 Open inlet * * % 7 65 Open outlet * % 7 65 Breakout N/A 50% Open inlet * % Open outlet * % Breakout % Open inlet * * * 6 * 6 7 N/A % Open outlet * * % Breakout N/A 99% Open inlet % Open outlet % Breakout N/A 70% 7 65 Open inlet % 7 65 Open outlet % 7 65 Breakout * N/A 50% Open inlet * * % Open outlet % Breakout * % Open inlet 5 * 7 * * % Open outlet * * % Breakout * * N/A ATTENUATORS x 5SL-500 Attenuation x 5SL-500 Attenuation x 5SL-500 Attenuation ATTENUATORS x 5SL-500 Attenuation x 5SL-500 Attenuation x 5SL-500 Attenuation Intelligent Air Solutions *Noise not normally heard by the human ear. Codes for Attenuator 5SL Domus Microban protected rigid duct sound attenuator. *Noise not normally heard by the human ear. Codes for Attenuator 5SL Domus Microban protected rigid duct sound attenuator. Intelligent Air Solutions 5

9 00mm DEEP MODELS 0mm DEEP MODELS WITH BYPASS WITHOUT BYPASS WITH BYPASS WITHOUT BYPASS GENERAL RANGE FEATURES AQH00E-B AQH00-B AQH00E-S AQH00-S AQH0E-B AQH0-B AQH0E-S AQH0-S Total Heat recovery exchanger Sound absorbing/thermally insulated EPP moulded body G filters Offset rectangular 0x60mm duct connections Backward curved quiet and efficient EC fans Integrated control electronics Re-usable filter frames Optional Optional CONTROL FEATURES Includes advanced AMIE technology (Air Management for Indoor Environments) Power indicator Status indicator (frost protection, summer bypass etc.) Fault indicator Independent fan speed control Switched live inputs (signal triggers): - Mains level x - Volt free to boost x - Volt free to max x variable speeds Clean filter indicator Frost protection Built in humidistat Run on boost timer Delay on boost Pre-commissioning filter protection bags Discreet run monitor Lockable commissioning mode BMS features - Pre-heater activation output - Remote shutdown enable - System healthy monitor and fault signals Time and date display Real time air temperature display Real time extract air humidity level display Easy to read, contemporary digital display BENEFITS - WHY IS THIS UNIT DIFFERENT? Extremely lightweight and compact Low power consumption and highly efficient Quick and easy installation and maintenance Simple and accurate commissioning Easy access filters Horizontal slab installation No condensate drain required Easy to design-in Provides improved, balanced humidity levels Wireless control for improved usability and easier installation Optional Optional Optional Optional 00% bypass aids summer cooling Cost effective model Extremely cost effective model years warranty Extra 5 year parts & year labour warranty Operation Specification for Polypipe s Silavent HRX-aQ supply and extract with heat recovery ventilation unit (*MVHR or ERV) shall be positioned and ducted as indicated on the system drawings and as detailed in the Installation and Operation Instructions. It shall be suitable for horizontal ceiling installation and offer the ability to fit directly to a slab. The unit shall supply filtered, fresh air to each of the habitable rooms and waste air shall be extracted from each of the wet rooms i.e. bathroom, en-suite, kitchen and utility room. The supply air shall be prewarmed, using the energy from the extract air using an integrated counter-flow heat exchanger. The extracted air shall also be filtered before it reaches the heat exchanger. Energy Recovery Ventilation (ERV) units will include a Total Heat recovery exchanger to recover both sensible and latent heat; to provide optimal indoor air conditions. The HRX-aQ unit shall offer independent fan speed control; that is adjustable to three levels; Low, Boost and Maximum (purge). These speeds will be controllable through a user interface HRX-aQ Bluebrain control. The boost facility can also be triggered from a lighting circuit, if required. The unit shall have the facility to commission the supply and extract fans independently on low (continuous background ventilation) and boost speed, through the adjustment buttons. Specification of unit The unit shall be the Silavent HRX-aQ as manufactured by Polypipe Ventilation and shall be listed on the Product Characteristics Database (SAP Appendix Q). The HRX-aQ unit shall be manufactured from sound absorbing Expanded Polypropylene (EPP), therefore providing thermal and acoustic characteristics. It shall include a counter flow heat exchanger for a heat exchange efficiency, at typical installation, of up to 88%. *MVHR - Mechanical Ventilation with Heat Recovery. ERV Energy Recovery Ventilation. Not supplied by Polypipe. horizontal ceiling units For Energy Recovery Ventilation, the unit shall include a Total Heat recovery exchanger, recovering both sensible and latent heat, thereby helping to provide allyear-round ambient indoor air temperatures. To avoid ceiling void restrictions, the unit shall be from 99mm deep, (50mm high and 89mm wide excluding connections) and up to a maximum of 9mm in depth. It shall weigh from between 7.9kg, up to and 8.kg to enable easy installation. The unit shall have a high efficiency, backward curved EC fans for low energy consumption and provide a Specific Fan Power of down to 0.66W(l/s), at typical installation. The heat exchanger shall be protected by G grade filters on the fresh air inlet intake and system extract. The heat exchanger and filters shall be accessible via the underside of the unit, enabling quick and easy maintenance. To avoid on-site damage, the filters shall be supplied in protection bags. The unit shall connect directly to Polypipe s Domus 0x60mm rectangular ducting and include offset 0x60mm duct connections, to allow ducts to easily cross over in tight spaces, whilst also enabling simple to design, in-and-out duct runs. Background ventilation noise shall be minimised down to db(a). The unit s fans should be quiet enough so as not to discourage occupant use, with very low breakout, open inlet and open outlet sound levels as detailed by Polypipe Ventilation and in accordance with Building Regulations. The unit can be fitted with a 00% automatic summer bypass. Outside air supplied through the bypass shall be filtered, so the air quality is maintained. The bypass shall open automatically when either the indoor air reaches a pre-set temperature of between +5 C and 5 C or through time clock control which is pre-set using the Bluebrain control. A manual override option is also available. The MVHR or ERV system shall be safeguarded against damage from very cold weather through an optional frost protection function that is controlled via the Bluebrain control. The frost protection shall automatically trigger when a pre-set level is reached. This can be between -5 C and +5 C. The unit shall be supplied with a connection to a Domus 97 condensate drain. A condensate drain for ERV units however, will not be required. Specification of control (user interface) The unit shall include an HRX-aQ Bluebrain control as its user interface, which if supplied with an ERV model, may also be wireless for flexible mounting. For ease of use, the control shall include an LCD display and have the following functions: Independent control of low (background), boost and maximum supply and extract flow rates Independent control of fan speed for accurate and straightforward commissioning Lockable commissioning mode Power-on, fault and status indicators Volt free BMS functionality Programmable time and date functions Programmable filter check Programmable 00% summer bypass Optional frost protection at pre-set levels Programmable humidity level boost switching Optional -minute delay on boost switching Optional 5 to 0-minute delay off boost switching Run-time monitor Temperature controlled switching for optional duct heater 6 Intelligent Air Solutions Intelligent Home Intelligent Air Solutions Air Solutions 7

10 Complying with Building Regulations Best practice design and installation Domestic ventilation Note: a. In addition, the minimum ventilation rates should be no less than 0. l/s per m of internal floor area (this includes all floors, e.g. for a two-storey building, add the ground and first floor areas). b. This is based on two occupants in the main bedroom and a single occupant in all other bedrooms. This should be used as the default value. If a greater level of occupancy is expected, add l/s per occupant. Student accommodation and care homes Approved Document Part L of Building Regulations mainly focuses on the assessment of energy performance and the calculation tool used for non-domestic buildings (the Simplified Building Energy Model or as otherwise known, SBEM). SBEM makes the following air flow assumptions: Bathroom (extract) Bathroom (supply) Minimum rate Minimum high rate Minimum low rate Kitchen 0 l/s adjacent to hob, l/s Total extract rate should or 60 l/s elsewhere be at least the whole dwelling ventilation rate given in the table below. Utility Room 0 l/s 8 l/s Bathroom 5 l/s 8 l/s Sanitary 6 l/s 6 l/s Accommodation l/s 0 l/s 5 Whole dwelling ventilation rate a.b. (l/s) STUDENT ACCOMMODATION REQUIRES TABLE.a - EXTRACT VENTILATION RATES ROOM INTERMITTENT EXTRACT CONTINUOUS EXTRACT TABLE.b - WHOLE DWELLING VENTILATION RATES NUMBER OF BEDROOMS IN DWELLING Bathroom (extract) Bathroom (supply) CARE HOMES REQUIRE l/s 0 l/s Design of continuous mechanical supply and extract with heat recovery (MVHR) systems Continuous mechanical supply and extract with heat recovery (MVHR) (also known as system ), is an effective way of balancing indoor air levels for a healthier living environment. Determining air flow rates* Step For any design air permeability, identify the whole dwelling ventilation rate from Table.b. Where the designed air permeability is intended to be leakier than 5m³/h.m² at 50 Pa, allow for infiltration in all dwelling types by subtracting from the whole dwelling ventilation supply rate, as listed in table.b: 0.0l/s.m³ x gross internal volume of the dwelling s heated space (m³) - however review Building Regulations cautionary advice in sec 5.0. Step Calculate the whole dwelling extract ventilation rate by adding-up the individual room rates for a minimum extract rate, from Table.a. The required extract rates Step The maximum whole dwelling extract ventilation rate (i.e. the boost rate) should be at least the greater of steps and. The maximum individual room extract rates should be at least those listed in Table.a for the minimum high rate. The minimum whole dwelling supply ventilation rate should be at least the whole dwelling ventilation rate found in Step. *Ref pg 9 of 00 Building Regulations. The position of supply or extract valves As detailed in the NHBC specification, you should ensure that air valves are appropriately specified for wall or ceiling locations, in addition to supply or extract. To enable supply and extract ventilation within a room, low velocity air valves should be positioned on the opposite side of the room to internal door openings. These should be positioned no closer than 00mm to walls when located on a ceiling and no more than 00mm from the ceiling when located on a wall. Whilst extraction air valves positioned in kitchens, should be a minimum of 600mm away from hobs. To aid homeowner comfort and avoid drafts, the position of air valves should take into account the location of tall furniture, seating and sleeping areas. If installing linear grilles, do not site them over doorways, as the supply air is not likely to ventilate the rooms correctly. Air transfer To ensure sufficient transfer of air throughout the dwelling, there should be a minimum gap of 0mm between the underneath of the door and the fitted flooring. If installing floorboards (or other similar surfaces) or there is no flooring in place, it is recommended making an undercut of 0mm under the door frame. Noise Any continuously running fans should be quiet enough so as not to discourage their use by occupants. By incorporating high quality Domus sound attenuators, as well as correctly installing the system, noise will be minimised. Duct and insulation To minimise pressure losses and air leakage, specify a high quality duct system, such as the Domus duct range and ensure installers are BPEC accredited to fit and commission an MVHR system. 00 Building Regulations demands duct insulation such as Domus Thermal, must be the equivalent of 5mm at 0.0 W/ (m.k) thermal conductivity, equating to a minimum thermal resistance of 0.65 K/W per m². In addition, the insulation also requires a continuous vapour barrier when insulating the duct between the MVHR unit and external terminals. Siting the MVHR unit: Position the MVHR unit as close to the external terminals as possible to minimise the duct runs and hence resistance within the system. Access to filters should be considered for easy maintenance. Further recommendations on best practice MVHR design and installation is also listed in the 00 Building Regulations, CIBSE guide, B 005 and NHBC Specification, 06. For more information or to book a Polypipe Ventilation CPD on best practice design and installation, please vent.marketing@polypipe.com Rigid Duct Plenum with Flow Control Device duct solutions By specifying and installing the HRX-aQ in conjunction with our Domus Flow Control Plenums, it will allow the ability to integrate stylish architectural grilles over traditional air valves. Radial Plenum with Flow Control Device Stylish architectural grilles Furthermore, when combined with Domus High Efficiency Green Line Bends, which reduce duct bend resistance by up to 60%, the full system s performance is outstanding. Designed to enable a uniform flow of air through the bend, Domus Green Line bends will also help and allow the system to achieve greater air flow rates that may otherwise not have been possible. Typical air flow through a standard bend Typical air flow through a Domus Green Line bend For more information on the full range of market leading Domus duct products, visit The comfort of occupants in care homes and student dwellings needs careful consideration, as well as their ability to easily control the ventilation levels within their rooms. By specifying an MVHR system, it will help ensure that healthy indoor air levels are consistently maintained. 8 Intelligent Air Solutions Intelligent Home Intelligent Air Solutions Air Solutions 9

11 Intelligent Air Solutions Polypipe Ventilation Sandall Stones Road Kirk Sandall Industrial Estate Kirk Sandall, Doncaster DN QR United Kingdom UK Tel: UK Fax: International Tel: + (0) International Fax: + (0) vent.info@polypipe.com Web: E & OE - we reserve the right to alter product specification without prior notice. 06 Polypipe Ventilation All product images are the copyright of Polypipe Ventilation and are not for reproduction without permission