Instant Quote
Best for planning, foundations, budgets and quick kit pricing.
- Instant MVHR or MEV kit estimate.
- Basic airflow calculation based on your property details.
- Automatically builds a material list and price.
- Ideal for early-stage projects.

Product Part Number: 443298
The Vent Axia Lo-Carbon Multivent MVDC-MSH is an advanced mechanical ventilation unit designed to deliver efficient and quiet ventilation in residential and commercial properties. With an integrated humidity sensor, this unit automatically adjusts its performance based on relative humidity levels, making it ideal for moisture-sensitive areas such as bathrooms or kitchens.
This energy-efficient unit boasts an ultra-quiet operation, an improved controllability system, and multispeed DC motor technology for precise airflow control. Whether installed in a ceiling, wall, or loft, the MVDC-MSH delivers 350m³/h of airflow with low energy consumption and best-in-class specific fan power (SFP) as low as 0.15 w/l/s.
| Feature | Details |
|---|---|
| Max Airflow | 350 m³/h |
| Dimensions (mm) | 340 (L) x 310 (W) x 249 (H) |
| SFP (Specific Fan Power) | 0.15 w/l/s |
| Motor | Low energy multispeed DC motor |
| Extract Spigots | Four 125mm or 100mm diameter spigots for quick duct connection |
| Boost Function | Activated via internal humidity sensor or switched live (LS) |
| Switched Live (LS) Options | Purge Speed and Boost Speed can be controlled via LS inputs |
| Humidity-Based Boost | Boost activated when humidity levels rise, ensuring effective ventilation |
| Mounting Options | Ceiling, Wall, or Loft mounting |
Note: To manually override the internal humidity sensor and activate boost or purge modes, you will need an Isolator Relay (Part No. 442030), which is sold separately.
For further information or to request a quote, feel free to contact us today!
Enter a few basic details about the property below and we’ll calculate a suitable Ventilation system with an instant quote.
I can help with room counts, MVHR vs MEV, kit options and understanding your quote before you continue.
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Add the floor area and room counts for the property.
The system checks the required ventilation rate and builds the kit.
You’ll be taken to a full quote page with the kit breakdown and pricing.
Larger homes, complex layouts or systems requiring multiple units may be better suited to a manual layout guide.
For larger or more complex properties, our design team can review your plans and provide a free estimate with the most suitable system and kit configuration.