Vectaire WHHR Midi Compatible Replacement Filter Set - G3
£14.50
MVHR unit guide
Vectaire WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD: specifications, filters & guide
MVHRVectaire
The Vectaire Midi is a wall, cupboard or loft mounted MVHR unit for homes up to 170 m², with summer bypass, frost-stat and up to 94% heat exchange efficiency.
- Automatic summer bypass
- Frost-stat
- Independent fan speed setting
- Boost from a switched live
- Integral humidistat option
Buy replacement filters for WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD
About the Vectaire WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD
The Vectaire Midi is a vertical whole-house mechanical ventilation unit with heat recovery (MVHR). The range covered here comprises the WHHR-Midi-BY, the Midi-BY-LCD with an integral LCD screen, and the Midi-BY-AT-LCD, which adds acoustic attenuation. Each is designed for homes up to 170 m² and is installed on a wall, in a cupboard or in a loft, always in the vertical position.
Two fans do the work: one extracts stale, damp air from the kitchen, utility room and bathrooms, while the other supplies fresh air to living areas and bedrooms. Both airflows pass through a counter flow heat exchanger, so heat from the outgoing air warms the incoming air without the two streams mixing. The unit is built to run continuously and should only be switched off for maintenance or filter replacement.
The casing is epoxy-painted steel with a thermo-acoustic lining, and the fans are EC brushless motors whose trickle, boost and purge speeds are set independently on each motor during commissioning. An automatic summer bypass lets both airflows avoid the heat exchanger, and a frost-stat reduces intake fan speed as the outside temperature falls. Humidistat versions are supplied either left or right handed, while the other versions have universal handing. The Midi-BY-AT-LCD is lined with Class O fire resistant acoustic foam to lower noise further.
Air passes through disposable filters on the front panel. The standard grade is G3, the filter size is 185 x 360 mm, and filters are available in G3, G4 and M5 grades. Cleaning or replacing the filters is part of the routine maintenance, and the heat exchanger itself should be cleaned annually.
Key specs
- Maximum capacity
- 101 l/s
- Airflow at 50 Pa
- Up to 95 l/s
- Heat exchange efficiency
- Up to 94% (SAP 2009 data); 93% (SAP 2012 data, kitchen + 1 wet room)
- Specific fan power (SAP 2009 data)
- 0.50 to 0.88 W/l/s, depending on number of wet rooms
- Specific fan power (SAP 2012 data)
- 0.51 to 0.92 W/l/s, depending on number of wet rooms
- Maximum wet rooms with the kitchen
- 6 additional (SAP 2009 data); 4 additional (SAP 2012 data), rigid ducting
- Dwelling size
- Up to 170 m²
- Heat exchanger
- Counter flow
- Operating temperature
- Up to 60°C
- Frost-stat active
- Outside temperature between +8°C and -3°C
- Size W x H x D (WHHR-Midi-BY, Midi-BY-LCD)
- 600 x 564 x 382 mm
- Size W x H x D (Midi-BY-AT-LCD)
- 648 x 595 x 395 mm
- Weight (WHHR-Midi-BY, Midi-BY-LCD)
- 24 kg
- Weight (Midi-BY-AT-LCD)
- 29 kg
- Recommended side clearance
- At least 150 mm each side of the cabinet
- Casing
- Epoxy-painted steel sheet with thermo-acoustic lining
- Supply
- 230 to 240 V, 50 Hz, single phase
- Total power at 100% speed
- 120 W (69 W at 80%, 31 W at 60%, 11 W at 40%, 2.2 W at 20%)
- Motor
- EC brushless, single width, single inlet, direct drive, forward curved impellors
- Supply cable
- 4 core flexible cord (black, brown, grey, green/yellow) or external connector box
- Isolation
- Triple pole switch with at least 3 mm contact separation when using the switched live
- Duct spigots
- 4 x 125 mm (5 in) nominal diameter
- Condensate outlet
- 21.5/22 mm pipe, left or right hand drain connectors fitted
- Condensate pipe insulation (unheated space)
- At least 25 mm of insulation, thermal conductivity 0.04 W/mK
- External grille distance from flue outlet
- At least 600 mm
- Installation ambient temperature
- 0°C to 40°C; not in wet or excessively humid areas
- Standard filter
- G3, disposable
- Filter size
- 185 x 360 mm
- Available grades
- G3, G4 and M5
- Replacement interval
- Annually or after a maximum of 3 cleaning cycles
- Boost overrun timer
- Adjustable up to 20 minutes
- Delay-on timer
- Optional: boost does not operate if switched off within 2 minutes
- Remote purge overrun timer
- 0 to 250 minutes, pre-set to 15 minutes (adjustable at factory)
- Remote LCD commissioning unit
- LCD-DISPLAY
- Breakout sound pressure at 3 m, 100% (Midi)
- 29.7 dB(A)
- Breakout sound pressure at 3 m, 100% (Midi-BY-AT)
- 25.3 dB(A)
- Breakout sound pressure at 3 m, 20% (Midi / Midi-BY-AT)
- 19.2 / 14.4 dB(A)
- Listing
- SAP PCDB Listed
- Building Regulations
- Parts L1A 2013 and F 2013
- Standards and directives
- IEC60335-2-80, LVD 2006/95/CE, EMC 2014/30/UE, EU RoHS, CE marked
- Manufacture
- UK, to ISO 9001
Replacement filters for the Vectaire WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD
Vectaire WHHR Midi Compatible Replacement Filter Set - G4
£16.00
Vectaire WHHR Midi Compatible Replacement Filter Set - M5
£18.75
How to change the filters
- Disconnect the mains supply
The unit uses a 230 V supply and has rotating parts, so the mains electrical supply must be disconnected before any cleaning or maintenance.
- Remove the filter covers
Take the filter covers off the front panel to expose the filters.
- Slide out the filters
Pull the tabs to slide each filter out of its slot.
- Clean or replace the filters
Clean the filters carefully with a vacuum cleaner. If they are due for replacement (annually or after a maximum of 3 cleaning cycles), fit new ones of the 185 x 360 mm size instead.
- Refit the filters and covers
Slide the filters back into their slots and refit the filter covers.
- Reset the filter saturation level
On versions with the LCD screen, use the user screen to reset the filter saturation level after the filters have been changed.
Manuals & downloads
Installation, Operating and Maintenance InstructionsPDF
Installation, Operating and Maintenance InstructionsPDF
WHHR-Midi LeafletPDF
Low energy environmentally friendly economical residential ventilation with EC motorsPDF
Midi SpecificationPDF
Midi DC LeafletPDF
WHHR-Midi InstructionsPDF
Revit FilePDF
Embodied Carbon Calculator: Basic ReportPDF
ErP Product FichePDF
Other MVHR units
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Specifications
Performance
- Maximum capacity
- 101 l/s
- Airflow at 50 Pa
- Up to 95 l/s
- Heat exchange efficiency
- Up to 94% (SAP 2009 data); 93% (SAP 2012 data, kitchen + 1 wet room)
- Specific fan power (SAP 2009 data)
- 0.50 to 0.88 W/l/s, depending on number of wet rooms
- Specific fan power (SAP 2012 data)
- 0.51 to 0.92 W/l/s, depending on number of wet rooms
- Maximum wet rooms with the kitchen
- 6 additional (SAP 2009 data); 4 additional (SAP 2012 data), rigid ducting
- Dwelling size
- Up to 170 m²
- Heat exchanger
- Counter flow
- Operating temperature
- Up to 60°C
- Frost-stat active
- Outside temperature between +8°C and -3°C
Dimensions & weight
- Size W x H x D (WHHR-Midi-BY, Midi-BY-LCD)
- 600 x 564 x 382 mm
- Size W x H x D (Midi-BY-AT-LCD)
- 648 x 595 x 395 mm
- Weight (WHHR-Midi-BY, Midi-BY-LCD)
- 24 kg
- Weight (Midi-BY-AT-LCD)
- 29 kg
- Recommended side clearance
- At least 150 mm each side of the cabinet
- Casing
- Epoxy-painted steel sheet with thermo-acoustic lining
Electrical
- Supply
- 230 to 240 V, 50 Hz, single phase
- Total power at 100% speed
- 120 W (69 W at 80%, 31 W at 60%, 11 W at 40%, 2.2 W at 20%)
- Motor
- EC brushless, single width, single inlet, direct drive, forward curved impellors
- Supply cable
- 4 core flexible cord (black, brown, grey, green/yellow) or external connector box
- Isolation
- Triple pole switch with at least 3 mm contact separation when using the switched live
Connections & ducting
- Duct spigots
- 4 x 125 mm (5 in) nominal diameter
- Condensate outlet
- 21.5/22 mm pipe, left or right hand drain connectors fitted
- Condensate pipe insulation (unheated space)
- At least 25 mm of insulation, thermal conductivity 0.04 W/mK
- External grille distance from flue outlet
- At least 600 mm
- Installation ambient temperature
- 0°C to 40°C; not in wet or excessively humid areas
Filters
- Standard filter
- G3, disposable
- Filter size
- 185 x 360 mm
- Available grades
- G3, G4 and M5
- Replacement interval
- Annually or after a maximum of 3 cleaning cycles
Controls & features
- Boost overrun timer
- Adjustable up to 20 minutes
- Delay-on timer
- Optional: boost does not operate if switched off within 2 minutes
- Remote purge overrun timer
- 0 to 250 minutes, pre-set to 15 minutes (adjustable at factory)
- Remote LCD commissioning unit
- LCD-DISPLAY
Acoustics
- Breakout sound pressure at 3 m, 100% (Midi)
- 29.7 dB(A)
- Breakout sound pressure at 3 m, 100% (Midi-BY-AT)
- 25.3 dB(A)
- Breakout sound pressure at 3 m, 20% (Midi / Midi-BY-AT)
- 19.2 / 14.4 dB(A)
Approvals & compliance
- Listing
- SAP PCDB Listed
- Building Regulations
- Parts L1A 2013 and F 2013
- Standards and directives
- IEC60335-2-80, LVD 2006/95/CE, EMC 2014/30/UE, EU RoHS, CE marked
- Manufacture
- UK, to ISO 9001
Model variants
- WHHR-Midi-BY
Bypass version with universal handing and no integral LCD. - Midi-BY-LCD
As the WHHR-Midi-BY with an integral LCD screen for commissioning and user settings. - Midi-BY-AT-LCD
Adds Class O acoustic foam lining and an integral LCD. Size 648 x 595 x 395 mm, 29 kg; breakout sound pressure 25.3 dB(A) at 3 m at full speed. - Humidistat versions (WHHR-Midi/LBYH, RBYH, Midi-BY+LCDLH, Midi-BY+LCDRH and AT equivalents)
Integral humidistat; supplied left or right handed, so the ductwork must match the handing. - WHHR Midi L, R, HL, HR, BL, BR, BLH
Earlier model list entries distinguished by drain side, humidistat and bypass.
Vectaire WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD part numbers
Unit models
| Part no. | Description |
|---|---|
WHHR-Midi/BY | Midi with bypass, universal handing (also printed WHHR-Midi-BY) |
WHHR-Midi/LBYH | Midi with bypass, left drain, humidistat |
WHHR-Midi/RBYH | Midi with bypass, right drain, humidistat |
Midi-BY+LCD | Midi with bypass, universal handing, integral LCD (also printed Midi-BY-LCD) |
Midi-BY+LCDLH | Midi with bypass, integral LCD, left drain, humidistat |
Midi-BY+LCDRH | Midi with bypass, integral LCD, right drain, humidistat |
Midi BY-AT+LCD | Midi with bypass, acoustic attenuation, universal handing, integral LCD (also printed Midi-BY-AT-LCD) |
Midi BYAT+LCDLH | Midi with bypass, acoustic attenuation, left drain, humidistat, integral LCD |
Midi BYAT+LCDRH | Midi with bypass, acoustic attenuation, right drain, humidistat, integral LCD |
WHHR Midi L | WHHR Midi, left drain |
WHHR Midi R | WHHR Midi, right drain |
WHHR Midi HL | WHHR Midi with humidistat, left drain |
WHHR Midi HR | WHHR Midi with humidistat, right drain |
WHHR Midi BL | WHHR Midi with bypass, left drain |
WHHR Midi BR | WHHR Midi with bypass, right drain |
WHHR Midi BLH | WHHR Midi with bypass and humidistat |
Controls & sensors
| Part no. | Description |
|---|---|
LCD-DISPLAY | Remote LCD commissioning unit for the Midi range |
DRH240 | Dynamic remote humidistat, 230V switched live boost trigger |
PIRFF | Passive infra red sensor, 230V switched live boost trigger |
THM | Thermostat, 230V switched live boost trigger |
Maintenance schedule
| Task | How often |
|---|---|
| Clean the filters Vacuum carefully. Work should be done by a suitably qualified person with the mains supply disconnected. | Regularly; frequency varies with the installation environment |
| Replace the filters Reset the filter saturation level on LCD versions. | Annually or after a maximum of 3 cleaning cycles |
| Clean the heat exchanger Vacuum the faces lightly. Never use water or other fluids. The exchanger may hold water if removed in cold weather, so have a plastic bowl ready. | Annually |
| Maintenance access check Keep sufficient access for safe maintenance or removal. | Annually (recommended) |
Performance & technical data
Airflow and total power by fan speed (Midi and Midi-BY-AT)
| Fan speed | Airflow (l/s) | Total power (W) |
|---|---|---|
| 100% | 101 | 120 |
| 80% | 79 | 69 |
| 60% | 58 | 31 |
| 40% | 36 | 11 |
| 20% | 14 | 2.2 |
Breakout sound pressure at 3 m by fan speed
| Fan speed | Airflow (l/s) | Midi (dB(A)) | Midi-BY-AT (dB(A)) |
|---|---|---|---|
| 100% | 101 | 29.7 | 25.3 |
| 80% | 79 | 27.2 | 23.4 |
| 60% | 58 | 24.4 | 18.7 |
| 40% | 36 | 21.6 | 15.8 |
| 20% | 14 | 19.2 | 14.4 |
Hemispherical free field propagation at a distance of 3 m from the unit.
Sound power levels Lw (dB) by octave band at 100% (101 l/s)
| Path | 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1k Hz | 2k Hz | 4k Hz | 8k Hz |
|---|---|---|---|---|---|---|---|---|
| Extract (Midi and Midi-BY-AT) | 65 | 65 | 63 | 63 | 59 | 58 | 57 | 54 |
| Supply (Midi and Midi-BY-AT) | 70 | 70 | 68 | 68 | 64 | 63 | 62 | 59 |
| Breakout (Midi) | 55 | 57 | 53 | 42 | 34 | 31 | 24 | 17 |
| Breakout (Midi-BY-AT) | 53 | 55 | 48 | 35 | 26 | 23 | 17 | 11 |
SAP energy level performance by exhaust terminal configuration
| Exhaust terminal configuration | 2009 airflow (l/s) | 2009 SFP (W/l/s) | 2009 heat exchange efficiency | 2012 airflow (l/s) | 2012 SFP (W/l/s) | 2012 heat exchange efficiency |
|---|---|---|---|---|---|---|
| Kitchen + 1 additional wet room | 15 | 0.50 | 94% | 21 | 0.51 | 93% |
| Kitchen + 2 additional wet rooms | 21 | 0.50 | 93% | 29 | 0.61 | 91% |
| Kitchen + 3 additional wet rooms | 27 | 0.55 | 92% | 37 | 0.75 | 90% |
| Kitchen + 4 additional wet rooms | 33 | 0.65 | 91% | 45 | 0.92 | 89% |
| Kitchen + 5 additional wet rooms | 39 | 0.76 | 89% | - | - | - |
| Kitchen + 6 additional wet rooms | 45 | 0.88 | 89% | - | - | - |
Using rigid ducting only. Figures at minimum flow rate conditions.
Midi range versions compared
| Version | Built-in humidistat | Size W x H x D (mm) | Weight (kg) | Enhanced acoustic attenuation |
|---|---|---|---|---|
| Standard (S) | No | 600 x 564 x 382 | 24 | No |
| Humidistat (H) | Yes | 600 x 564 x 382 | 24 | No |
| Acoustic attenuation (AT) | On request | 648 x 595 x 395 | 29 | Yes |
Universal handing applies to the non-humidistat versions.
Accessories & controls
Remote LCD commissioning unit
- LCD-DISPLAY
- Can be mounted wherever convenient to the user
- Shows fan speeds, temperatures, humidity, bypass status, error and service notices and filter saturation
Remote dynamic humidistat
- DRH240
- 230 V switched live boost trigger
- May have an integral over-run timer
Passive infra red sensor
- PIRFF
- 230 V switched live boost trigger
- May have an integral over-run timer
Thermostat
- THM
- 230 V switched live boost trigger
- May have an integral over-run timer
Remote switch or pull cord
- 230 V switched live boost trigger
- A light switch can also be used; where more than one is used, each must be double pole
0-10V connections (factory set)
For a BMS (remote motor shut-off), CO2 detector, home automation system or external pre-heater
3 speed selector switch (factory set)
Listed among the factory-set control options
Troubleshooting
LCD shows that the filters need replacing (filter saturation level)
Likely cause: Filters have reached their saturation level
What to do: Clean or replace the filters, then reset the filter saturation level on the LCD user screen.
LCD commissioning options locked
Likely cause: An incorrect passcode was entered 5 times in a row
What to do: The system locks automatically for one hour. Commissioning options are for the installer and need the Commissioning Access Code.
Condensation produced by the unit
Likely cause: The unit may sometimes produce condensation
What to do: Make sure the condensate drain is fitted, trapped, insulated where needed and falls continuously to the household drainage.
At a glance
- Unit type
- MVHR
- Manufacturer
- Vectaire
- Product range
- Vectaire Midi (vertical MVHR)
- Versions
- WHHR-Midi-BY; Midi-BY-LCD (integral LCD); Midi-BY-AT-LCD (acoustic attenuation, integral LCD); humidistat versions left or right drain
- Handing
- Universal on versions without humidistat; humidistat versions are left or right handed
- Mounting
- Vertical: wall, cupboard or loft
- Dwelling size
- Up to 170 m²
- Duct spigots
- 4 x 125 mm nominal diameter
- Standard filter
- G3, disposable
- Listing
- SAP PCDB Listed
- 94%Heat exchange efficiency (SAP 2009 data; 93% on SAP 2012 data)
- 101 l/sMaximum capacity
- 0.50 W/l/sLowest specific fan power (SAP 2009 data)
- 29.7 dB(A)Breakout sound pressure at 3 m, full speed (Midi); 25.3 dB(A) for Midi-BY-AT
- G3Standard filter grade
- 125 mmDuct spigot diameter
Vectaire WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD features
All versions
Automatic summer bypass
Both airflows can bypass the heat exchanger automatically when internal and external temperatures sit between adjustable setpoints, so warm weather does not add unwanted heat to incoming air.
Frost-stat
The intake fan speed is reduced in proportion as the temperature falls, which limits cold air entering the home. It acts when the outside temperature is between +8°C and -3°C.
Independent fan speed setting
Trickle, boost and purge speeds are set separately for the supply and extract motors at commissioning, so the airflow can be matched to the design of the home.
Boost from a switched live
Boost can be triggered by a light switch (double pole where more than one is used), a DRH240 remote humidistat, a PIRFF passive infra red sensor, a THM thermostat, or a remote switch or pull cord.
Run-time and power outage counters
The unit counts running time and power outages, and the figures can be downloaded using a QR code.
Humidistat versions
Integral humidistat option
Humidistat versions run at a pre-determined boost speed when the factory-set humidity trip point is reached, then return to trickle speed once humidity falls below it. These versions are left or right handed.
Midi-BY-LCD and Midi-BY-AT-LCD
Integral LCD screen
The LCD shows fan speeds, inside and outside temperatures, humidity, bypass status, error and service notices and filter saturation level, and lets the user reset filter saturation after a filter change.
Midi-BY-AT-LCD only
Acoustic attenuation
The casing is lined with Class O fire resistant acoustic foam, giving breakout sound pressure of 25.3 dB(A) at 3 m at full speed against 29.7 dB(A) for the standard Midi.
Factory-set options
Optional holiday mode and 0-10V inputs
Factory-set options include a holiday mode (default 50% of trickle speed) and 0-10V connections for a BMS, CO2 detector, home automation system or external pre-heater.
Installing the Vectaire WHHR-Midi-BY, Midi-BY-LCD, Midi-BY-AT-LCD
The Midi must be installed vertically, normally in a cupboard, loft or ceiling void, in clean, dry conditions. It is not suitable for the exterior of a dwelling and must not be installed where there is excessive oil or grease, where flammable or corrosive gases, liquids or vapours are present, in ambient temperatures above 40°C or below 0°C, or in areas of excessive humidity. Where possible it should not be placed directly above a bedroom or living room. Allow at least 150 mm of clearance on each side of the cabinet for access to the motors, and arrange access for safe maintenance, which is recommended annually.
Mounting uses a wall bracket and a lower safety bracket: mark a level line about 40 mm below the position of the unit's top face (excluding the duct ports), use the bracket as a template for the five fixing holes, fit the bracket with its interlocking side at the top, hang the unit on it and fix the safety bracket. The fixings supplied are for solid walls. The four 125 mm spigots are marked for the supply and exhaust ducts. Insulate all ducts in an unheated space and only the cold ducts (supply from outside and extract to outside) in a heated space; fit fire dampers where ducting passes through a fire partition; and fit a safety grille to any spigot not connected to ducting. The ductwork installer should tick the as installed left or right handed box on the label on top of the unit.
A condensate drain must be fitted. Connect it to the left or right hand outlet that matches the duct layout, always on the atmosphere side of the unit, cap the unused outlet, and fit a wet or dry trap with a continuous fall to the household drainage. Insulate any run through an unheated space. Installation, electrical connection and commissioning must be carried out by a suitably qualified and competent person, in line with current wiring regulations, using a triple pole isolation switch with at least 3 mm contact separation when the switched live is used. With the control board panel removed, 230 V live connections are accessible.
