MVHR in a timber house: when it is useful and what to check
MVHR is not an accessory required by the structural material. It is a strategy for controlled fresh air in a building with a high-performance envelope.
This guide sets out checks and decisions. It does not replace design by qualified professionals or requirements imposed by the competent authority. Solutions depend on the site, structural system and required performance.
The decision to make
Define airflow and occupancy
People, rooms, moisture generation and air-quality goals drive sizing rather than floor area alone.
Design ducts and terminals
Space, velocity, pressure loss and cleanability must be resolved before wall production.
Control noise and commissioning
Nominal airflow is insufficient if terminals disturb occupants or supply and extract are not balanced.
Plan maintenance
Filters, condensate and components must remain accessible with instructions owners can follow.
Documents and evidence to request
- design airflow schedule
- coordinated duct layout
- acoustic and energy data
- terminal commissioning record
- filter, cleaning and condensate plan
Every document should refer to the same design revision. A sound report based on obsolete geometry does not close the risk; it must be coordinated with drawings, details, specifications and site inspections.
The mistake to avoid
Adding MVHR late puts ducts wherever space remains, increasing bends, bulkheads, noise and clashes.
A practical sequence
- Define the required performance and site conditions.
- Collect surveys, reports and applicable requirements.
- Compare alternatives against explicit criteria, not a standard detail.
- Coordinate structure, envelope, services and installation sequence.
- Record inspections, results and responsibilities before work is concealed.
Frequently asked questions
Does MVHR stop windows being opened?
No. It provides controlled ventilation; occupants can still open windows.
Does it remove all moisture?
It manages indoor vapour when designed and operated correctly but cannot fix leaks or rising damp.
Is heat recovery always required?
Configuration depends on climate, goals and the project energy balance.
Conclusion
The system is justified when air quality, comfort, energy and maintenance are assessed together.
The existing call to action on this page can be used to submit the project to MANINI Villae. A reliable assessment requires site data, design information and checks by the appointed professionals.
Primary sources consulted
- ENEA — efficienza energetica degli edifici, accessed 4 September 2026.
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