Radiansa provides all the main elements required for the implementation of subsoil depressurisation systems.
A subsoil depressurisation system works by capturing radon-bearing air in a sump or network of sumps and conveying it, by means of a mechanical extractor, to the exterior through extraction pipes.
In its standard configuration, suitable for most buildings, it is an easy-to-install system that does not require major changes to the building design and, when using a purely wind-driven extractor, can operate without additional energy consumption.
The collection sumps are installed within the gravel layer located below the slab and are connected via horizontal pipes to a vertical pipe and an extractor (wind-driven or electric), in order to direct the radon towards an outlet usually located at roof level.
The extraction flow creates a low-pressure zone beneath the slab. In this way, the radon produced below the slab is drawn into the sumps and expelled outside through the pipes and extractor. The airtightness of the depressurised zone is maintained by an anti-radon membrane beneath the slab.
We supply the principal components required for the implementation of a depressurisation system: radon sumps (collection points) and wind or hybrid extractors, described below.
Robust polyethylene sump for capturing radon gas in a ground depressurisation system. The sump has pipe inlets with 110 mm diameter on four sides, allowing the connection of between one and four pipes as required by the sump network.
The sump is installed beneath the building slab, embedded in a layer of granular fill to promote gas flow. It connects via 110 mm PVC pipes to other sumps (network) or directly to an extractor.
The Siber AXR radon extractors are in-line centrifugal fans designed specifically for use in subsoil depressurisation systems in both residential and commercial buildings. They operate with a single-phase ball-bearing motor (230 V – 50 Hz) equipped with thermal cut-out protection, suitable for continuous operation.
Our standard product, the AXR 125, has inlet and outlet ducts with 125 mm diameter. A connection kit (couplings, elbows, drain cap) is available to connect the AXR 125 model to a 110 mm pipe network.
The airflow rate is 265 m3/h, providing a pressure difference of approximately −251 Pa.
Purely wind-driven extractor consisting of a turbine made from high-quality aluminium, corrosion-resistant, mounted on two pre-lubricated and sealed stainless-steel bearings.
The standard version has an inlet pipe with 250 mm diameter. We supply galvanised steel reducers to connect 250 mm wind extractors to a 120–125 mm vertical radon extraction pipe.
An electric motor can be added to increase airflow if required, creating a hybrid wind/electric solution.
The following outlines the basic components of a ground depressurisation system and the design considerations that should be taken into account:
An anti-radon barrier, typically in the form of a membrane, is installed above the depressurised zone and serves two functions within the radon mitigation system. Firstly, it acts as a physical barrier to prevent residual radon from entering the building. Secondly, it provides an impermeable surface over the depressurisation system, improving the airtightness of the area beneath the slab.
To achieve both objectives, it is essential to seal all perforations in the membrane required for the passage of pillars, extraction pipes, other penetrations and the joints between membrane sections.
Further information on anti-radon membranes can be found via this link.
Automatic radon control systems respond in real time to radon levels, continuously monitored by a sensor integrated within the system. The system activates a fan or extractor to force air movement; the motor operates only when radon levels exceed a preset threshold, achieving significant energy savings compared with a continuously running ventilation system.
We supply the following radon sensors suitable for intelligent ventilation control systems:
The Smart Radon Sensor (SRS) is a fast-response device designed to activate a ventilation system while at the same time transmitting real-time radon level data to a network or PC.
It supports all standard power supply voltages and includes two AAA batteries to continue operating in the event of a power outage. It is particularly suitable for implementing intelligent sensor networks using Sarad’s “Radon Rooms” application. Information on Smart Sensor connectivity options (WiFi, RS485, Zigbee, switch) is available on the page dedicated to radon sensors.
Radon gas:
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