Ilmavuotolukema

Ilmavuotolukema refers to a measurement of air leakage in buildings. It is typically expressed in units of liters per second per square meter of building envelope area (L/s/m²) at a specific pressure difference, often 50 Pascals. This metric is a crucial component of blower door testing, a standardized method used to quantify the airtightness of a building. A lower ilmavuotolukema indicates a more airtight building, which is generally desirable for energy efficiency and comfort.

The ilmavuotolukema is determined by the combined effect of numerous small cracks and openings in the building's shell. These can include gaps around windows and doors, penetrations for electrical and plumbing services, and joints between different building components. High levels of air leakage can lead to significant heat loss in winter and heat gain in summer, increasing heating and cooling costs. Additionally, uncontrolled air infiltration can cause moisture problems, leading to mold growth and degradation of building materials.

In many regions, a maximum acceptable ilmavuotolukema is specified in building codes and energy performance standards. Achieving a low ilmavuotolukema is therefore often a requirement for new construction and major renovations. Identifying and sealing these air leakage points is a key strategy for improving a building's energy performance, enhancing indoor air quality, and ensuring occupant comfort. The blower door test, which yields the ilmavuotolukema, is a valuable tool for diagnosing these issues and verifying the effectiveness of air sealing efforts.