VENTILATION & AIR HANDLING Creating the perfect environment


In the search for optimal air quality, the role of air handling units extends beyond mere temperature regulation. A critical yet often overlooked aspect is their ability to manage humidity levels, says Simon Marshall.


Simon Marshall


Head of business development at Humidity Solutions


humiditysolutions.co.uk C


equipped to address both extremes. The discovery of inadequate humidity


ooling coils in AHUs are the unsung heroes during the humid summer months, efficiently extracting excess moisture from


the air. This dehumidification process is vital for maintaining comfortable and healthy indoor environments during this period. However, the winter presents a challenge. As the cold fresh air is heated, moisture levels drop, leading to dry conditions that can trigger various issues, from respiratory discomfort to static electricity. This contrast highlights the importance of incorporating humidity control in the initial design phase of AHUs, ensuring they are


levels in operational AHUs, whether newly installed or long-standing, is not a dead end. Tailored solutions, such as bespoke steam lances, can be introduced to mitigate these issues. Designed for compact spaces, these lances provide precise humidity adjustments, preventing the common problem of ductwork dampness and ensuring that even the most constrained systems can achieve optimal humidity levels. Maintaining the right humidity level is not just about comfort; it’s a health imperative. In environments such as hospitals and offices, where the spread of viruses can cause major issues, humidity levels between 40-60% are crucial. This range is scientifically proven to reduce the transmission of common colds and other diseases, making humidity control a key component. Moreover, it’s imperative to ensure a consistent supply of fresh air within


buildings, especially during the colder months. The legal mandate requires that a minimum of 5-8 litres per second of fresh air per person is provided within indoor spaces. This constant influx of fresh air during winter necessitates the integration of effective humidification systems to counteract the naturally low relative humidity levels typical of this season, thereby maintaining the optimal humidity range for health and comfort. Addressing low humidity levels is not only critical for human well-being but also essential for the preservation of various materials and the smooth operation of processes. For instance, low levels of humidity can cause cracking of paint on precious artworks in museums, increased static and dust accumulation in printing and woodwork, as well as fluctuations in relative humidity levels in laboratories and clean rooms where it is essential to maintain year-round stable conditions. As we advance in our understanding of indoor air quality, the significance of


Humidifiers installed with an air handling unit at a university


humidity control within AHU systems cannot be overstated. By integrating smart design and innovative solutions, we can create environments that are not only comfortable but also conducive to health and well-being. For those seeking to optimise their AHU systems, Humidity Solutions provides the expertise and support needed to navigate the complexities of humidity control.


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EIBI | MAY 2025


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