Vent Axia Lo-Carbon Multivent MVDC-MSH unit with Humidity Sensor


Vent Axia Lo-Carbon Multivent MVDC-MSH unit with Humidity Sensor

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Further Information

What is Mechanical Extract Ventilation (MEV)

Passivent house

Mechanical Extract Ventilation (MEV) systems provide continuous ventilation.

Centralised mechanical extract systems (c-MEV) also known as a Multipoint and Central Extract System draw moisture-laden air from multiple wet rooms of a property, Essentially the concept is to provide simultaneous, low level extraction from kitchens, bathrooms, shower rooms, utility rooms and toilets to a central extract fan typically located in a loft space or hallway cupboard via a system of ductwork and grilles to control humidity levels.. The extracted air is then normally discharged to outside via a single duct and grille/cowl.

Decentralised mechanical extract fan (d-MEV) also known as a continious running fan is perfect for single applications such as bathroom, kitchens or utility rooms if a (c-MEV) is not suitable

As this type of system has to work 24 hours a day, 7 days a week, 365 days a year, low noise levels and reliability are critical.

Our MEV systems are cost-effective and offer many benefits to home-owners:

  • Elimination of condensation dampness

  • Healthier living environment

  • Removal of musty odours

  • Low running costs and low-energy operation

  • Easy installation and low maintenance

MEV Suitable Applications:

  • Ideal apartment ventilation solution where there is possibly only one external wall.

  • Homes with more than one wet room.

Building Control System 3

Building Regulation  Part F - System 3 covers continuous mechanical extract ventilation (MEV). This can be either a whole house centralised MEV system, or localised decentralised MEV fan.

Current Building regulation requires such systems be designed to provide background extraction at a rate equating to approximately 0.3 to 0.5 air changes per hour or individual room rates of 13 kitchen,and 8l/s for bathrooms (whatever higher is used) with the ability to boost by approx  25% for times when increased ventilation is required e.g. during cooking.

Replacement air is normally able to be provided via structural air leakage with older buildings above 5ma@50Pa or if  the home is built to good airtight standards with background ventilation openings like trickle vents and wall vent having a minimum equivalent area of 2500 mm2 should be fitted in each room, except wet rooms, from which air is extracted 

Always refer to your local building contro regulations as this information can change.


Vent Axia Lo-Carbon Multivent MVDC-MSH unit with Humidity Sensor

Product Part Number

Vent Axia MVDC-MSH - 443298


With a DC motor the Multispeed Multivent is one of the most efficient central extract units in the UK. The Multivent MVDC MSH offers the option of ‘Close Control’ both in the residential and the commercial sectors with the added benefit of an inbuilt humidistat. Extended guarantee to 5 years is offered on the MVDC LoWatt energy saving motor.

Please note - You can purchase the MEV unit with or without the ductwork on this listing

Key Features

  • Internal Humidity sensor
  • Ultra-quiet - acoustically lined for low noise levels
  • Recognised in SAP Appendix Q
  • Complies with Building ADF (System 3)
  • Option of wall, ceiling, and loft mounting
  • Improved controllability
  • The unit has Long life, low energy multispeed DC motor
  • Ceiling, wall, or floor Installation is recommended 
  • PVC outer casing with an acoustic lining is included as standard, ensuring minimum noise levels.

Technical Features

  • Max Airflow of 350m3/h
  • Best in class Specific Fan Power (SFP) as low as 0.15 wls
  • Dimensions (mm) 340 long x 310 wide x 249 high
  • Fitted with four extract 125 or 100mm diameter spigots allowing quick connection to ducts
  • Switched Live Boost connection
  • Fully variable normal and boost speeds
  • Fully serviceable unit with all parts accessible
  • 2-year standard or optional 5-year parts warranty


The potentiometer-controlled speed selector allows accurate setting of airflow

The unit has 2 fully variable speeds for trickle and boost, with an inbuilt humidistat activation for the boost speed.

A switched live (LS) can also be used to select boost speed when wired through an Isolator Relay (Part No. 442030 - not supplied).

An additional third speed (purge) is available using a second switched live connection.


(443298) the Boost setting is activated by the internal humidity sensor. The internal humidity sensor uses one of the two available LS inputs, the other remaining LS input can be used to switch the unit to Purge speed. 


has the option to switch from Normal to Boost speed (in effect over-riding the internal humidity sensor), this can be achieved by connecting an isolated switched live connection to the LS connection on the power supply terminal block. This must be isolated by using, for example an Isolator Relay Control, Vent-Axia part number 442030, or similar.

Isolator relay controller, Vent-Axia part number 442030


Technical Specification

MVDC-MSH Technical Information

Dimensions (mm)

A       B       C      D      E      F       G      H      I     J   
340 72.5 25 15 360 214 310 249 150 85

Technical Drawing

Ducting Kit Info

Multivent MVDC-MSH Kit 

List of Products in Kit

Part number   Description 2 point kit   3 point kit   4 point kit   5 point kit
437634 Multivent MVDC-MS 1 1 1 1
QV-125AVP-E 125mm - Quiet-Vent extract air valve PVC 2 3 0 5
C125 125mm pipe connector 1 2 3 4
GPVC125W 125mm PVC external grille (white) 1 1 1 1
IFD125 125mm Insulated flexible ducting X 10 Meter   1 2 3 3
ST75 Roll 75mm x 10m silver foil tape  1 1 1 1
CT550 Cable ties (Pack of 10) 1 1 1 2
T125 125mm T piece 0 0 1 2



BPC have years of experience in delivering equipment around the UK and other Worldwide destinations. Our dedicated dispatch team work hard to ensure the highest standards are met so that your goods arrive on-time and in pristine condition.

Our market knowledge and experience allow us to match our service to meet your requirements swiftly and safely.

Free Delivery

We offer free delivery on any order over £250 to any mainland UK or Ireland address  

Worldwide Delivery

Worldwide delivery is possible on almost all our products at low costs, delivery to countries outside the EU are normally delivered to the nearest customs office, port or terminal for the purchaser to collect and complete custom clearance.

Please contact us to confirm shipping cost and availability.  

End-To-End Support Delivery is available within 48-72 hrs, depending on method of transport, for hundreds of stock items.

Customers receiving a pallet delivery will be emailed on day of dispatch advising of delivery date. Parcel deliveries will be notified via email or SMS directly from DPD.

These checks are part of a unique commitment to building relationships with customers, understanding their specific delivery needs and responding to them positively and promptly.  

We deliver on Service

Key components such as ductwork and fittings plus the most popular selling MVHR units are kept in stock in our UK-based warehouse, which means that you receive the best possible delivery dates.

All goods are expertly packed by a professional team so that your equipment is received in pristine condition ready for installation.

All deliveries co-ordinated to suit your specific requirements and construction programme.

Delivery Partners

We only use the couriers with the highest standard of service that include

  • Fastway
  • DPD
  • Montgomery Transport
  • Liam Connolly Roadfreight Ltd
  • Europa Worldwide


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