HEATING, VENTILATION & SERVICES 67


CHANGE TO THE DECENTRALISED LINE


With design and installation of ventilation systems increasingly essential for both new builds and renovations, Richard Poole of Siegenia looks at how decentralised systems can off er a important way around trickle vents.


suffi cient to ensure adeuate air echange and thus protect living spaces from moisture and pollutants.


A


On 15 June 2022, following several years of consultation, revisions to Part L,   O of the uilding egulations fi nally came into force. This was the fi rst update to these regulations in nearly a decade, and the net step on the road to a more sustainable future. The Future Homes Standard ensures that all new homes built from 2025 produce around 75% fewer carbon emissions than those constructed under current regulations with a fi nal goal of net zero in 2050.


The regulation changes set improved targets for air movement and notably the reuirement for enhanced tricle vents in windows. Under this change, all new and replacement windows should be fi tted with tricle vents. or two storey properties, habitable rooms and itchens reuire window vent perfor- mance to 8000 mm2


EA, and bathrooms


(with or without a toilet) to 4000 mm2 EA. There is however an important caveat within the new regulations that could ignite the uptae of heat recovery ventilation for those who do not wish to disturb the sealing and integrity of their windows by drilling holes through them. For homes with a balanced ventilation system i.e. whole-house decentralised or whole-house centralised tricle ventila- tors are not reuired.


Centralised whole-house heat recovery systems have been around for some time and so are well accepted and understood. However, the installation of these systems does reuire careful design and planning due to the spaghetti-lie ducting networ reuired to interconnect all rooms. or this reason they are normally only consid- ered for new build projects. But even for the new build sector such an undertaing can be off-putting.


ecentralised whole-house heat recovery ventilation is less understood but offers some meaningful benefi ts over


s we produce more tightly insulated buildings, window ventilation alone is no longer


its centralised cousin. Decentralised heat recovery ventilation is a great alterna- tive not only being uite possibly the only viable solution for refurbishment proects but also offering a less labour-in- tensive and costly option for the new build maret. o lets loo at this system in a little more detail, and the potential installer and consumer benefi ts.


HOW DO DECENTRALISED HRV SYSTEMS WORK IN HOMES?


Decentralised heat recovery ventilation consists of a wall mounted control panel, duct with an integrated ceramic heat echanger or accumulator bi-directional fan eternal grille and fi lter. ie an MVHR system, the purpose is to reclaim heat provide fresh air and to etract


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