16 THE CLIMATE CHALLENGE


AS WE MOVE TOWARDS THE FUTURE HOMES STANDARD AND NET ZERO, OUR HOMES WILL BECOME EVER MORE AIRTIGHT TO MEET CO2


TARGETS


requires new build homes to have worldleading levels of energy efficiency, including a further lowering of Dwelling Emission Rates (DER) as part of the drive towards carbon neutrality.


MEV


What alternative does MEV offer to  A reliable, highly efficient, quiet and easy to operate ventilation system is key to unlocking a healthier, greener future. MEV is a whole house extract ventilation system that extracts air continuously at a low rate. It is a low energy ventilation system designed with multiple extract points to simultaneously draw moisture laden air out of wet rooms, bathrooms, kitchen, WC’s and utility rooms providing a quieter and more efficient system compared to separate fans. Some MEV units will include a humidity


meaning when you have increased occupancy in a home, the unit will increase ventilation rates to ensure the best indoor environment. Housebuilders should look for a MEV unit that offers marketleading efficiency combined with ultra-quiet performance and sufficient airow. This will help housebuilders meet DER requirements and improve IAQ for homeowners. Housebuilders should also look at the PCDB list for the best performing MEV systems, with some boasting a specific fan power as low as . Wlw and airow of up to 159 l/s.


sensor, designed to increase the fan speed in proportion to relative humidity levels, saving energy and reducing noise. Other models include a CO2


sensor,


There are even MEV units available that are made from recycled plastic, keeping plastic in the circular economy rather than landfill.


dMEV


What type of ventilation is dMEV? A decentralised Mechanical Extract Ventilation (dMEV) system is a low energy, continuous mechanical extract ventilation system designed to draw moisture laden air out of wet rooms, bathrooms, kitchen, WC’s and utility rooms providing a quieter and more efficient system compared to intermittent fans. They also ensure good IAQ as they continuously extract the stale air out of


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the room and ensure it is replaced by fresh air via trickle vents.


High-pressure development and a silent mied ow impeller mean dMEV units can meet the ventilation requirements of many domestic installations without the need to use a traditional centrifugal fan. Housebuilders opting for this technology should choose a unit that’s been tested to the new SAP 10 performance requirement and listed in the PCDB. dMEV units can achieve exceedingly low SFP values as low as 0.08 w/l/s, combined with almost silent operation at 7.4 dB(A), protecting households from noise pollution. A single high efficiency  motor delivers these low specific fan powers.


Housebuilders should also look for dMEV units with an IPX5 rating that allows installation in Zone 1, 2 and 3; the option of 100 mm and 125 mm models; and with variable speed setting for easy installation and commissioning. Units that provide fully adjustable airow mean whole house rates can be achieved easily using fewer fans, delivering increased ventilation rates at the lowest sound levels with the fewest fans, helping housebuilders meet ventilation requirements. Whether you choose MEV or


dMEV, look for units that offer an easy-to-operate control platform, compact design, easy installation, as well as simple and accurate commissioning. And ranges that feature a wealth of control and switching options give housebuilders the eibility to provide a solution for any new build scenario. With the deadline for meeting Part F


and Part L of the Building Regulations upon us, housebuilders should look for ventilation that helps them meet DER requirements while improving IAQ. Other growing trends include opting for ventilation with a low SFP and ultra-low noise levels.


As we move towards the Future Homes Standard and net zero, our homes will


become ever more airtight to meet CO2 targets and so it’s essential that energy efficient ventilation is installed in every new home to ensure healthy homes in the future.


Steve Pearce is NBR product manager at Vent-Axia


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