Ivo Remmelg Indoor Air Quality Indoor air quality (IAQ) is super important because we spend around 90% of our time indoors, whether it’s at home, work, or school. Poor air quality inside can have a big impact on both your health an... Apr 15, 2026
Ivo Remmelg Ventilation basics- Mixing vs. Displacement ventilation Introduction Ventilation plays a critical role in maintaining healthy indoor environments, particularly in spaces where air quality and comfort are paramount. Traditionally, ventilation systems fall i... Apr 15, 2026
Ivo Remmelg The Influence of Bedroom CO₂ Concentration on Sleep Quality A person spends about a third of their life sleeping, and high-quality sleep is one of the most important pillars of long-term health. While we often focus on factors like light, noise, and mattress c... Apr 15, 2026
Ivo Remmelg Understanding Energy Performance of Buildings Directive The Energy Performance of Buildings Directive (EPBD) is a key piece of EU legislation aimed at improving the energy efficiency of buildings across Europe. It is part of the EU’s broader Green Deal and... Apr 15, 2026
Ivo Remmelg Demand Controlled Ventilation Introduction to Demand Controlled Ventilation (DCV) Systems Modern airtight buildings require good ventilation. Variable Air Volume (VAV) systems allow changing of the air volume. Sometimes central un... Apr 15, 2026
Ivo Remmelg Humidity recovery. Don't be fooled by marketing department. ✅ Humidity recovery cannot return more absolute humidity than the difference between indoor and outdoor air humidity allows. (You can’t “create” humidity with recovery — only slow down its loss.) ✅ Ve... Apr 15, 2026
Ivo Remmelg Ventilation myths #1/8 Indoor humidity in winter is defined by the gap between outdoor and indoor temperatures. For example: At +20 °C and 60% relative humidity → ~10 g/m³ absolute humidity At –20 °C and 60% relative humidi... Apr 15, 2026
Ivo Remmelg Ventilation myths #2/8 The purpose of a business enterprise is to generate profit. Anything that does not directly increase revenue may at first glance seem like an expense that reduces the return on investment. Improving v... Apr 15, 2026
Ivo Remmelg Ventilation myths #3/8 Ventilation Myths #3/8. Demand-controlled ventilation is expensive. According to modern building practices, it’s no longer possible to build houses with natural ventilation. Buildings are designed to ... Apr 15, 2026
Ivo Remmelg Ventilation myths #4/8 Ventilation myths #4/8. It is important to blow in enough fresh air into the occupied zone! Ventilation systems are typically designed with two main principles: 1- Exhaust from wet rooms and other are... Apr 15, 2026
Ivo Remmelg Ventilation myths #5/8 If there’s no air, opening a window solves the problem. The feeling of lacking fresh air is not only about high CO₂ levels. Other factors matter too: higher temperature, volatile organic compounds, ex... Apr 15, 2026
Ivo Remmelg Ventilation myths #6/8 If the ventilation unit is undersized, the entire system must be replaced. Is the CO₂ level too high in your bedroom and you sleep all winter with the window open? Do you open the windows when guests ... Apr 15, 2026
