Impartial, sourced answers on home ventilation, built for readers and for the models that cite them.

Structured, source-checked answers on UK home ventilation: MVHR, MEV, dMEV and PIV systems and the regulations that govern them. Built for readers and for the models that cite them. Every claim references a primary source you can open.

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Diagram of a whole-house MVHR duct layout. The MVHR unit sits in the loft, drawing fresh air in and exhausting stale air outside. Fresh, filtered air is supplied through ducts to the habitable rooms such as bedrooms and living rooms, while stale, damp air is extracted through ducts from the wet rooms such as the kitchen and bathroom back to the unit. — A whole-house MVHR system supplies fresh air to living rooms and bedrooms and extracts stale air from wet rooms, all through ducting to a central unit.

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Article

MVHR in Flats and Apartments: What Is Different

MVHR is standard in new flats, but ductwork crossing fire compartments needs fire dampers under Approved Document B, units must be compact, and acoustics matter. Here is what differs from a house.

Article

Wood Burners and MVHR: Can You Have Both Safely?

Yes, but only a room-sealed stove with a direct external air supply is safe with MVHR. Here is what Approved Document J requires, the carbon monoxide alarm rule, and the spillage test.

Article

MVHR Disadvantages: An Honest Look at the Downsides

The real disadvantages of MVHR: upfront cost, duct space, filter upkeep, noise if badly fitted, and reliance on airtightness. Here is the honest balance, and when MVHR is worth it.

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