Ilmanvuototaso

Ilmanvuototaso refers to the measurement of uncontrolled air leakage in a building's envelope. This leakage, often referred to as air infiltration and exfiltration, can significantly impact a building's energy efficiency, indoor air quality, and occupant comfort. It is typically measured using a blower door test. This test depressurizes or overpressurizes the building, forcing air through any cracks, gaps, or openings in the building's shell. The amount of air that flows through these leaks is then quantified, usually in terms of air changes per hour (ACH) at a specific pressure difference.

A higher ilmanvuototaso indicates a less airtight building, leading to increased heat loss in winter and heat gain in summer. This necessitates greater energy consumption for heating and cooling systems, resulting in higher utility bills. Furthermore, uncontrolled air leakage can draw in unconditioned outdoor air, potentially bringing pollutants, moisture, and allergens into the living space, which can negatively affect indoor air quality and contribute to the growth of mold and mildew. Conversely, a low ilmanvuototaso signifies a well-sealed building, which is crucial for achieving good energy performance and maintaining a healthy indoor environment. Building codes in many regions specify maximum allowable ilmanvuototaso for new construction to ensure a certain level of energy efficiency and air quality.