Efficient MVHR ducting is the backbone of a high-performance ventilation system. The right ducts improve air quality, reduce heating bills, and ensure quiet, comfortable living spaces. In the UK, choosing the best MVHR ducting system involves careful consideration of duct type, size, and layout. This guide breaks down everything builders and self-builders need to know.
The Role of Ducting in an MVHR System
MVHR ducting acts as the circulatory system for your home, supplying fresh air and extracting stale air efficiently. Poorly designed ducts can reduce system performance, create noise, and increase energy costs. Proper ducting design ensures:
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Balanced airflow to every room.
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Minimal pressure loss for energy efficiency.
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Quiet operation with sound attenuation.
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Compliance with UK Building Regulations.
Why Professional Duct Design is Essential
Even minor errors in duct sizing or routing can impact performance. Professional design guarantees:
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Correct duct diameters for optimal airflow.
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Efficient routes with minimal bends.
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Reduced vibration and hum through proper support and insulation.
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Long-term reliability and lower maintenance costs.
DIY ducting layouts often lead to underperforming MVHR systems with hidden costs.
Rigid vs Semi-Rigid Ducting: Pros and Cons for UK Homes
MVHR systems typically use rigid or semi-rigid ducting. Choosing the right type depends on your home, ceiling space, and system performance goals.
Benefits of Semi-Rigid Radial Systems
Semi-rigid radial ducting is increasingly popular in UK homes due to its flexibility and quiet operation:
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Easy installation: Lightweight and manoeuvrable.
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Radial design: Each room receives a dedicated duct from a central manifold.
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Reduced pressure loss: Smooth interior surfaces enhance efficiency.
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Low noise: Less vibration and sound transfer compared to rigid systems.
When to Use Traditional Rigid Ducting
Rigid ducting is ideal in situations where efficiency and long-term performance are paramount:
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Long, straight runs with minimal bends.
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Dedicated service voids or accessible ceiling spaces.
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High-performance MVHR units requiring precise airflow.
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Round vs flat ductwork considerations to fit structural constraints.
Choosing the wrong type can lead to inefficiency, higher energy bills, and more maintenance.
The Impact of Poor Ducting on Your MVHR System
Improper ducting can undermine your MVHR system, creating discomfort and hidden costs.
Noise and Pressure Loss Issues
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Oversized or undersized ducts create turbulence.
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Too many bends increase resistance, forcing the fan to work harder.
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Vibrations through rigid runs produce audible hums.
Hidden Costs of an Inefficient System
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Reduced heat recovery and higher energy bills.
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Uneven airflow causing poor indoor air quality.
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Increased wear and maintenance.
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Non-compliance with UK Building Regulations.
Investing in professional ducting design prevents these problems and maximises system longevity.
FAQs on MVHR Ducting
Can I Use Flexible Ducting for My MVHR?
Flexible ducting is generally not recommended for primary runs due to high airflow resistance. Short connections to vents are acceptable but keep them minimal.
How Do You Insulate MVHR Ducting?
Insulate supply ducts to prevent heat loss and extract ducts to avoid condensation. Options include:
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Pre-insulated rigid or semi-rigid ducts.
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Closed-cell foam or mineral wool wraps.
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Sealed joints to maintain efficiency.
How Many Bends Can an MVHR Duct Run Have?
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Keep bends shallow (≤90°).
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Minimise the number of bends to reduce pressure loss.
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Plan routes carefully using a duct sizing calculator for best results.
What Is a Manifold in an MVHR System?
A manifold is a central hub in radial ducting systems, distributing airflow evenly:
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Ensures balanced supply and extract to each room.
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Reduces noise transfer.
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Simplifies future maintenance.
Enquire About a Bespoke MVHR Design and Ducting Plan
Every home is unique. Our bespoke MVHR ducting designs ensure the right type, size, and layout for maximum efficiency, comfort, and compliance with UK standards.
Contact us today to secure your tailored MVHR ducting plan and optimise your home’s indoor air quality.