Sisäilmanpaineen

Sisäilmanpaine refers to the air pressure inside a building relative to the pressure outside. This pressure difference, even if slight, can significantly influence indoor air quality and energy efficiency. Positive indoor air pressure means the air inside is at a higher pressure than the outside, causing air to flow outwards through any leaks or openings. Conversely, negative indoor air pressure means the outside air pressure is higher, leading to outside air infiltration into the building. Maintaining a slightly positive indoor air pressure is often considered ideal for residential and commercial buildings. This helps to prevent unwanted infiltration of outdoor pollutants, dust, and moisture, which can negatively impact occupant health and building materials. It also aids in controlling drafts and can improve the performance of ventilation systems by ensuring conditioned air is delivered where intended. Several factors contribute to indoor air pressure, including the operation of mechanical ventilation systems, the tightness of the building envelope (how well sealed it is), and the presence of exhaust fans. Imbalances in these factors can lead to excessive positive or negative pressure, both of which can have detrimental effects. Properly designed and commissioned HVAC systems are crucial for managing and maintaining optimal indoor air pressure for a healthy and comfortable indoor environment.