vierimisen

vieriminen, Finnish for ventilation, is the process of moving air through a building or space to improve indoor air quality, regulate temperature, and control moisture. The practice dates back to early Finnish architecture, where multi‑storey wooden houses required continuous airflow to prevent mold and maintain healthy living conditions. Traditionally, windows and latticework were arranged so that warm, humid air could escape while allowing fresh, dry air to enter.

Modern building codes in Finland emphasize the importance of efficient ventilation. Ventilation systems range from simple passive methods, such as opening windows and doors, to mechanical systems that use heat recovery ventilators (HRV) and energy recovery ventilators (ERV). HRV units reclaim heat from exhaust air to warm incoming fresh air, improving energy efficiency, whereas ERV systems also recover some moisture.

Proper ventilation offers several benefits. It reduces indoor pollutants such as carbon dioxide, volatile organic compounds, and allergens, contributing to healthier occupants. It also mitigates condensation problems on walls and ceilings, thereby extending the lifespan of building materials. However, excessive ventilation can lead to increased heating costs during winter, particularly in older, less airtight structures. Careful balance and system design are therefore crucial to maximize health and economic advantages.

In recent years, the Finnish construction industry has promoted the concept of energy‑efficient ventilation, integrating smart controls and variable airflow rates that respond to indoor conditions. This approach aligns with the country’s broader sustainability goals and its longstanding emphasis on building quality.