Studies conducted over the past two decades¹ show that people in industrialized countries spend between 80% and 90% of their time indoors — at school, in the office, in shops, or at home. When discussing indoor environmental pollution, these studies indicate that indoor air can be two to five times more polluted than outdoor air. For this reason, Indoor Air Quality (IAQ) has become a key factor for human health, comfort, and productivity. The main factors affecting indoor climate include the concentration of particulate matter, carbon dioxide (CO₂), volatile organic compounds (VOCs), microorganisms, as well as insufficient or improperly designed ventilation. Without an effective ventilation system, these pollutants can accumulate rapidly and may lead to the so-called Sick Building Syndrome (SBS), characterized by reduced concentration, fatigue, asthma, allergies, and respiratory problems. Recent studies in Northern and Western Europe show that a significant portion of these health issues among children and adults is directly related to the quality of the air inside the buildings they occupy.
Modern ventilation and air-conditioning systems play a fundamental role in maintaining high indoor environmental quality through controlled air exchange, high-efficiency filtration, and precise control of temperature and humidity. This is the definition widely accepted by HVAC professionals. If we compare buildings to the human body, the HVAC system can be considered the most critical system, responsible for delivering the necessary air, oxygen, and energy to every part of the building, allowing it to function properly.
The use of certified air handling units and heat recovery systems tested according to the standards of Eurovent Certita Certification guarantees real operating performance, verified technical parameters, high energy efficiency, and proven filtration and heat exchange quality. This is important both for investors and for building occupants.
Modern HVAC solutions incorporate multi-stage filtration systems (including HEPA filters), carbon dioxide (CO₂) monitoring, and automatic control of the fresh air flow rate according to the actual occupancy of the building. Advanced ventilation and air purification technologies ensure a safe and clean indoor environment even in buildings with high requirements, such as hospitals, schools, laboratories, industrial facilities, and office buildings.
TANGRA ventilation and air-conditioning equipment combines high energy efficiency, low noise levels, reliable operation, and proven performance certified by TÜV and Eurovent. This is of critical importance for modern energy-efficient buildings. Good indoor climate quality is not only a matter of comfort — it leads to better health, higher productivity, fewer sick leaves, and longer lifetime of building systems. For this reason, indoor air quality has become one of the main criteria in modern building design and construction, and it will continue to be a leading factor in the development of the HVAC industry in the coming years.
