Ventilation is one of the most important but misunderstood parts of creating a healthy home. As properties become more airtight, insulated and energy efficient, moisture and pollutants can become trapped indoors if there is not an effective ventilation strategy in place.
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Highlights
In Episode 6, Aaron is joined by Nick Higgs from ELTA Trade, who has nearly 15 years of experience in residential ventilation. Nick explains why installing a fan is not always enough and why the design, positioning, installation and commissioning of a ventilation system all affect its performance.
They discuss how older properties naturally allowed air and moisture to escape through gaps, chimneys and less airtight building materials. Modern improvements such as new windows, doors and insulation can reduce this natural airflow, creating the conditions for condensation, mould and poor indoor air quality.
We cover:
- Why ventilation is often overlooked until condensation or mould appears
- How increasingly airtight homes have changed the way properties need to be ventilated
- The difference between intermittent and continuously running extractor fans
- Why extractor fans require a suitable source of replacement air
- How incorrectly positioned trickle vents can bypass the intended airflow
- Common installation problems, including flexible ducting, poor commissioning and fans venting into loft spaces
- Why ventilation systems should be installed and tested by competent professionals
- How decentralised mechanical extract ventilation works
- What mechanical ventilation with heat recovery, or MVHR, can provide
- The benefits and potential costs of installing a whole-house ventilation system
- How heating, humidity, occupancy and everyday activities affect moisture levels
- Why ventilation problems often appear after lifestyle changes, such as working from home or having a baby
- The importance of cleaning and maintaining extractor fans
- Why dehumidifiers can help manage moisture but should not replace effective ventilation
- How Part F of the Building Regulations is changing ventilation design, installation and accountability
Nick also shares his Healthy House Checklist:
- Check your extractor fans. Make sure they are present, working, clean and producing the correct airflow for the room.
- Check the supply of replacement air. Trickle vents should be open and clear, with enough space beneath internal doors for air to move throughout the property.
- Review your everyday habits. Avoid switching extractor fans off, contain moisture where possible and ventilate rooms properly after showering, cooking or drying clothes.
This episode provides practical guidance for homeowners, landlords, builders and property professionals looking to understand how effective ventilation can reduce condensation, prevent mould and create a healthier indoor environment.
