PHAM NEWS | MARCH 2026 Ventilation & Heat Recovery 35


Controlled ventilation for ground- fl oor voids


The Mori WMF subfl oor fan from Elta is designed to provide controlled mechanical ventilation for subfl oor voids in residential and retrofi t applications. Subfl oor spaces beneath suspended timber fl oors and enclosed ground-fl oor constructions can accumulate moisture and ground gases when airfl ow is insuffi cient, increasing the risk of mould, timber degradation, and poor indoor air quality.


The Mori WMF is available in both extract and supply confi gurations, allowing engineers to select the appropriate ventilation strategy based on site conditions and moisture or gas risks. The unit delivers airfl ow rates of up to 17 litres per sec and is externally mounted to simplify installation


and ongoing maintenance, particularly in refurbishment projects.


An integrated controller provides continuous trickle ventilation with an optional boost function, supporting consistent airfl ow management. The fan incorporates a brushless EC motor and an IP55-rated enclosure, supporting energy- effi cient operation and long-term durability. The current Mori WMF model is fully interchangeable with previous WMF units, enabling straightforward upgrades without major system changes.


Elta says subfl oor ventilation is critical but often an under-specifi ed element of building services design. As expectations around building health, durability, and occupant wellbeing continue to rise, greater consideration of below- ground airfl ow strategies will be essential. ◼ phamnews.co.uk/326/56


Single system provides fi re safety too


Combining energy efficiency, façade integration and fire safety in a single system, SODECA’s Hatch ventilation solutions feature motorised dampers for air extraction and smoke evacuation. The range comprises the Roof System for roof installations and the Wall System for façade applications, providing flexibility across different building types. All units are certified F400


and F300 for smoke exhaust and have undergone EN 12101-3 fire resistance testing in accredited laboratories. The systems have


Compact ducted units are quiet and effi cient


Designed for indoor space ventilation via ducting, the CJVR range from Vent-Axia provides a compact fan solution for commercial and residential applications where space, noise and energy performance are key considerations. The range is available in two models, allowing specifi ers and installers to select the most appropriate option based on airfl ow performance, durability requirements and energy effi ciency targets.


Material change makes a positive input


Nuaire has replaced the virgin ABS casing on its Drimaster-Eco Positive Input Ventilation (PIV) system with recycled plastic, cutting embodied carbon by 167 tonnes annually. The casing is now black, but performance remains unchanged, and production continues at Nuaire’s South Wales facility. The systems draw fi ltered loft


air and introduce it gently into homes through a central diff user, creating positive pressure that expels stale and damp air via


natural leakage points. Over a million units are installed in the UK, frequently in social housing due to fast installation, minimal disruption and long service life. The latest Drimaster-Eco uses up to 20% less energy than earlier models, reducing running and life cycle costs. Variants include the NOx model with carbon cartridges to lower indoor nitrogen oxide and versions with 400W heating or the Flatmaster system for homes without lofts. ◼ phamnews.co.uk/326/59


Handy tool to identify the kit you need


To help installers identify the best solutions for the properties they are working on, Zehnder has launched a free online ventilation system selector. It off ers an initial reference point for navigating evolving ventilation requirements, guiding users based on property type and priorities. As homes become more airtight, selecting eff ective


ventilation has grown more complex. The system fi nder simplifi es early decision-making by considering airfl ow needs, heat recovery potential and comfort expectations, rather than detailed design. It delivers tailored recommendations and indicative costs within minutes, supporting early planning amid tighter building standards, updates to Part F and Part L, and the forthcoming Future Homes Standard. ◼ phamnews.co.uk/326/60


The units feature a structural


design intended to minimise vibration and operational noise, making them suitable for use in noise-sensitive environments such as offi ces, residential buildings and light commercial spaces. This design approach


automatically close when ventilation is not required, reducing unnecessary air losses and contributing to lower energy demand. Customisable finishes


allow the systems to be adapted to architectural requirements and integrated into building façades without compromising functionality.


also been tested under extreme environmental conditions, including snow and wind loads, to verify performance and durability. Motorised dampers


SODECA’s Hatch solutions combine ventilation, energy performance, and smoke evacuation capability within a single integrated system. ◼ phamnews.co.uk/326/57


supports stable airfl ow delivery while reducing acoustic impact on occupied areas. CJVR units are designed to be


integrated into ducted ventilation systems, supporting fl exible installation within ceilings or service voids. The unit’s small footprint allows installation in tight ceiling or service voids, while robust construction supports long-term operation. By off ering multiple


performance options within a single product family, the CJVR range provides a practical solution for designers and installers seeking controlled indoor ventilation with a focus on acoustic comfort, energy effi ciency and durability. ◼phamnews.co.uk/326/58


MVHR with intelligent controls keep the heat


The Mechanical Ventilation with Heat Recovery (MVHR) range from Wavin provides ventilation designed for low-energy homes. The systems extract air from kitchens and bathrooms while supplying fi ltered, fresh air to living spaces. A built-in heat exchanger recovers heat from outgoing air to temper the incoming supply, helping manage energy use.


The MVHR units feature intelligent controls that adjust airfl ow automatically in response to humidity levels, maintaining balanced indoor conditions without manual input. Filter


options are available to address dust and pollen, and the ducting incorporates anti-bacterial and anti-fungal properties. The range is compact, energy-effi cient, and designed for integration into modern home layouts, off ering a solution that supports indoor air quality and consistent ventilation performance.


The ventilation systems from Wavin provide an additional solution for homes upgraded under the UK’s Warm Homes Plan, addressing ventilation needs that are not fully covered by the initiative. ◼ phamnews.co.uk/326/61


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