Are MVHR Systems Noisy?

Noise is a key concern for homeowners considering Mechanical Ventilation with Heat Recovery (MVHR). Many people ask: Are MVHR systems noisy? The answer depends on installation quality, system design, and maintenance.

When properly installed, an MVHR system should be almost silent. However, poor ducting, incorrect fan speeds, or low-quality components can result in unwanted noise.

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The Growing Need for Quiet Ventilation Systems in the UK

As homes become more airtight, mechanical ventilation is essential. However, homeowners expect discreet and quiet systems that don’t interfere with daily life.

Modern MVHR units are designed to:

• Operate at noise levels below 30dB, equivalent to a whisper.
• Use acoustic ducting and sound insulation to reduce noise.
• Run efficiently without creating disruptive airflow sounds.

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Case Study: Reducing MVHR Noise in a Family Home

A family in Southampton reported excessive noise from their MVHR system after a DIY installation. The main issues:

• Undersized ducting, creating air turbulence.
• High fan speeds, increasing mechanical noise.
• Lack of insulation around ducts, allowing noise to travel between rooms.

After professional adjustments, including correct duct sizing and fan calibration, noise levels dropped by 60%, and the family barely noticed the system running.

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Common Causes of MVHR Noise & Solutions

1. Fan Noise
   • Running fans at high speed can create unwanted noise.
   • Solution: Choose a variable-speed MVHR unit to reduce noise at lower airflow settings.
2. Ductwork Vibrations
   • Poorly secured ducts cause vibrations, amplifying sound.
   • Solution: Use anti-vibration mounts and acoustic insulation around ducts.
3. Airflow Restrictions
   • Undersized or kinked ducting increases air resistance, making the system work harder.
   • Solution: Install correctly sized ducting to allow smooth airflow.
4. Poor Installation Location
   • If the MVHR unit is placed near bedrooms or living spaces, noise may be more noticeable.
   • Solution: Position the unit in a loft, cupboard, or utility room away from living areas.

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Long-Term Cost & Energy Savings

• A well-installed MVHR system ensures silent operation, improving indoor comfort.
• Energy-efficient fans reduce electricity consumption, cutting running costs by up to 30%.

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References

• [1] Ventilation Noise Reduction Guide, 2023

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Author Bio

Dr. Julian Carter is a highly experienced thermal systems expert with over 15 years in the field, holding a PhD in thermal systems. His career spans academic research, consulting, and teaching, focusing on air conditioning and refrigeration systems. Dr. Carter bridges the gap between theoretical advancements and practical applications, providing expert insights to organisations like ClimateWorks, where his guidance informs decision-making and industry best practices. Notably, he has worked on international projects with organisations such as Daikin Industries, the International Institute of Refrigeration (IIR), and the United Nations Environment Programme (UNEP). These collaborations addressed energy efficiency, sustainable refrigerants, and advanced cooling technologies. Currently a lecturer at Edinburgh University, Dr. Carter combines his expertise with a passion for educating the next generation of engineers and advancing climate control technologies.

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