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Extraction Fans for Indoor Swimming Pools & Chlorine Ventilation

07 June 2021

We all know that chlorine is widely used to treat water for swimming pools in leisure centres and domestic pools.

Through the process of pool water evaporation, an indoor swimming pool will continuously produce huge volumes of chlorine or salt-water vapour. The temperature humidity in the air and these chemicals added to the water make the environment very aggressive. So aggressive that the materials used must be corrosion protected.

Ordinary comfort ventilation is not enough when installed into the environment of an indoor swimming pool. The lifetime of the product would be too short, the components are not manufacturer to withstand the environment and it will put an end to the fun and relaxation intended for the building very quickly.

Ventilating Chlorine Effectively
Treating water with too much chlorine will increase the risk of corrosion of the components within the pool room and the technical room but insufficient treatment results in poor hygiene.

When extracting chlorine fumes from areas such as plant rooms and storage cupboards after dosing, the corrosive air can cause a building to rot from the inside out if not managed effectively. The moisture caused by the process of condensation when the humidity is high within the pool area, causes numerous problems. When this moisture meets cold surfaces and condenses, it produces rust, blistering of paint, deterioration of structural supports and many other negative cosmetic effects on the building. This continues to be a problem as buildings are constructed quickly and poorly with unsuitable insulation making them draughty and a breeding ground for these problems as they’re magnified in an area such as an indoor pool. As mentioned earlier the best practice for swimming pool ventilation and exhausting chlorine vapours is to extract via a polypropylene fan and plastic ductwork as metal systems would corrode over time.

Secondary to this cosmetic damage, the build up of mould, mildrew and unpleasant odour will have a negative effect on indoor air quality. This will affect both user of the pool and the employees working in and around the building, affecting their health, motivation and wellbeing.

Axair Fans supplies polypropylene fans that are well suited for use within corrosive environments, those having high degrees of humidity and moisture as well as a high concentration of caustics, chlorine or acids. Other corrosive gases that might exist in typical industrial environments include hydrogen sulphide, sulphur dioxide, ammonia, ozone, mercaptans, hydrogen fluoride or sodium hypochlorite. These are not the only gases that need to be dealt with, but they are the typical culprits of equipment corrosion.

ATEX Requirements
ATEX is the presence of any gas or dust material that has the potential to become explosive, The ATEX rating is determined by the regularity of the presence of these explosive gases or dusts in the air. For example if a explosiove gas is in the air constantly, this would require a higher degree of ATEX protection than an environment that has hazardous vapours occasionally. Chlorine has the potential to become explosive when mixed with certain other chemicals. Therefore, the swimming pool extraction system may need to be ATEX (Atmospheres Explosibles) rated. It is recommended that advice should be taken from an ATEX expert regarding zoning certain areas and which components need to be ATEX certified. Learn more about ATEX gas and dust zones in our technical section.

Corrosion Resistant Polypropylene Fans for Chlorine Ventilation
Axair’s range of polypropylene fans are suitable for extracting from swimming pool plant rooms and chemical storage cupboards. We can offer single inlet centrifugal fans in standard versions and variants that are suitable for ATEX Zone 2. Single inlet centrifugal fans are suitable for extracting air through ductwork and other equipment that may generate a resistance. Furthermore, the polypropylene range of fans can be floor or wall mounted with spigot inlet and discharge, making duct connections easy using our flexible connectors or flanges.

We have polypropylene fans to move air from less than 50m/h to over 10,000m³/h with many accessories to make for easy installation. They can also be supplied with a range of inverters for speed control and energy saving.
Extraction from the pool area has different requirements as the air volume to extract from the area may be considerably larger, depending in the size of the pool area. The air from this area may still be corrosive and require a specialist fan. Contact us with the details and we will offer a fan from one of our higher capacity ranges.

To select the correct swimming pool extraction fan for your requirements, we will need to know if your installation is going to be moving corrosive air and if the components needs to be ATEX certified. Call our team on 01782 349 430 to discuss your application or email



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