Ventilation

When designing a ventilation system, it's easy to treat the filter as a secondary accessory. A wrong filter class choice isn't immediately visible — it shows up six months later when the filter is clogged at half its expected service life, or two years later when indoor air quality doesn't meet standards. P1, P2, P3 are not arbitrary labels: each class defines precisely which particles the filter stops, at what efficiency and at what energy cost. If you know how to read these classes, you choose the right filter from the start.

Buildings are over-ventilated, sometimes six times more than needed. How demand controlled ventilation works, what it saves, and what it really takes. 

A family of four releases 10–15 litres of water into their home's air every day — and without proper ventilation, that water becomes condensation, mould and heavy bedroom air. The complete room-by-room guide: which equipment to choose for the bathroom, kitchen, bedroom, laundry and garage, the airflows required by Standard I5-2022, and the full product shopping list for the whole house, with real budgets.

On 24 July 2026, Regulation (EU) 2024/1834 becomes fully applicable — the biggest legislative change in the fan industry in 15 years. Efficiency thresholds rise, exemptions nearly vanish, and a large share of cheap fans permanently leaves the EU market. Complete guide: who is affected, which deadlines apply and what decisions to make now.

Neighbour's cooking smell coming through your bathroom ventilation? It's not the building manager's fault — it's a technical problem with a precise solution. Find out exactly why it happens, how to check in 30 seconds and what to do so it never happens again.

ISU file rejected over a missing certificate? The exact list of mandatory documents, common mistakes and correct F400/F300 classification under P118-1:2025.

An undersized heat recovery unit leaves behind humidity and stale air; an oversized one costs more for no real benefit. This guide walks through two simple sizing methods — by rooms and occupants, or by home volume — and includes an interactive calculator that tells you exactly how many m³/h you need, plus the recommended product range.

The real difference — the one that never shows up in any quote — only becomes visible after installation: at the first fire-safety inspection that finds an unapproved unit in a smoke extraction system, in a motor that burns out after six months of continuous operation on a dryer it was never designed for, or simply in an energy bill that keeps climbing month after month with no obvious explanation.