PHAM NEWS | MARCH 2025 34 Ventilation & Heat Recovery Flexibility, durability and performance


The DEXA dMEV 150 fan from Elta Trade is a decentralised mechanical extract ventilation unit aimed at enhancing indoor air quality in residential settings. This product responds to the problems of condensation, damp, and mould in homes. The DEXA dMEV 150 is


MVHR clears the path for more effi cient IAQ results


Targeting businesses looking to improve indoor air quality in an energy effi cient way, Mitsubishi Electric has launched a new mechanical ventilation with heat recovery (MVHR) system with a low profi le at high airfl ow. The LGH-160/200/250RVXT3-E Lossnay MVHR can recover up to 88% of heat energy from outgoing stale air to signifi cantly reduce the energy needed to bring incoming air up to room temperature, while refreshing the indoor air and removing pollutants, viruses and other irritants. The new, upgraded ‘T’ range


diff ers slightly from the fl agship Lossnay range by being lower profi le (500mm height) in the higher airfl ow units, which would traditionally be double stacked. The RVXT3 works by


recovering the heat and reducing carbon usage for both heating


Tackling overheating with hybrid system


The MRXBOX Hybrid Cooling System has been designed by Nuaire to improve indoor air quality and manage overheating in residential spaces. This system is an extension of the MRXBOX mechanical ventilation with heat recovery (MVHR) range and combines heat-exchanger cooling recovery with a direct expansion (DX) coil for eff ective cooling. The MRXBOX Hybrid Cooling


System features a wall-mounted temperature sensor that automatically activates the cooling module when indoor temperatures exceed a set threshold. The product specifi cally addresses areas where natural ventilation is inadequate, providing a solution to overheating issues in apartments.


The system is engineered to


deliver a cooler fresh-air supply, enhancing occupant comfort while ensuring compliance with Building Regulations Part O, which addresses overheating mitigation in new builds. Unlike traditional cooling solutions, the MRXBOX Hybrid Cooling System aims to off er a more energy-effi cient


alternative, making it suitable for various residential settings, including those designated as aff ordable housing. This system not only provides eff ective cooling but also maintains high indoor air quality year-round through its high-effi ciency MVHR capabilities. ◼phamnews.co.uk/325/58


and cooling. It also features a new control mode which can be used with a pressure transducer to off er constant pressure control which can allow one unit to serve multiple rooms with varying fresh air requirements without over-ventilating. The reduced number of units


required will also mean less wall penetration. As another option, the plug-and-play CO2 sensor helps to save energy and keep indoor air fresh in relation to the number of occupants in the space.


The units come with a dual


barrier coating on fans to stop dirt, dust and grease adhering to the blade. This means the building will be left with better indoor air quality for longer as all air passes over the fans, as well as extending equipment life. “The new system makes a whole host of improvements to upgrade from our current range of commercial RVXT MVHRs,” says Mitsubishi’s Hern Yau. “For example the fl exible fan commissioning is available in 5% increments, off ering lower energy use, lower running costs and easier compliance with Part L.” ◼ phamnews.co.uk/325/55


A new in-line ventilation unit has been added to Sodeca’s range of ventilation equipment for rectangular ducts. The CJVR is a versatile fan that can be installed in commercial, residential or offi ce buildings for air renewal. A compact solution for indoor


space ventilation via ducting, the CJVR units are available in two models, allowing users to choose the most suitable option based on performance, durability, and energy effi ciency requirements. In both models, the structural design minimises vibrations and noise during operation, suiting these


engineered to continuously extract stale and moisture-laden air from areas such as bathrooms and kitchens, thereby reducing the likelihood of condensation. The fan boasts an airflow


capacity of up to 50 litres/sec, surpassing the standards set by Part F of the Building Regulations. It builds upon the previous DEXA dMEV 100 model, offering greater airflow and installation flexibility. An energy efficient EC motor ensures quiet operation while keeping power consumption low.


Additionally, the fan includes


features like an intelligent timer and humidity sensor that enhance its performance by adjusting airflow automatically. Designed for easy installation in various settings, the DEXA dMEV 150 caters to both new builds and retrofitting projects. “With the DEXA dMEV 150, we’ve responded to a growing


requirement for powerful, energy efficient ventilation solutions that offer continuous air movement,” says Nick Higgs, national sales manager. “The DEXA dMEV 150 provides the flexibility, durability, and performance that contractors and specifiers need to meet today’s ventilation challenges and tomorrow’s regulations.” ◼ phamnews.co.uk/325/56


Rectangular ducts meet demand square on


units for spaces where maintaining low noise is a priority. These units are also designed


to simplify both installation and maintenance. The compact format of the unit facilitates


mounting onto rectangular ducts, while the external connection box makes the wiring process signifi cantly easier and more functional. ◼phamnews.co.uk/325/57


Made from recycled materials


Ventilation ducting from Domus is now manufactured primarily from recycled plastic. The company says it already uses 100% recyclate on its rectangular ducting and over 95% of its fittings use 100% High Impact Polystyrene (HIPS), which comes from post-consumer recycled plastic. Commenting on this latest development, Domus Ventilation


product manager Paul Williams says: “The built environment accounts for approximately 30% of annual carbon emissions in the UK. Whilst the lion’s share is generated in the day-to-day operation of buildings, carbon emissions embodied into buildings during manufacturing and construction are significant. As a manufacturer in the building sector, we fully accept our responsibilities in regards to this. Using plastic that is destined for landfill, recycling it, and using it in our ducting is just one way in which we are making our products – and our manufacturing – more sustainable, without affecting quality. Whilst colour variation is to be expected due to the nature of the recyclate, the form, fit, function and quality remain.” ◼phamnews. co.uk/325/59


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