Passively delivering more for less

Changes to Building Regulations and calculation methods are revealing that a passive approach to domestic ventilation can deliver more, for up to 80% less- in initial installation and lifetime costs.

Independent research* commissioned by Passivent Ltd, the UK’s leading domestic natural and mechanical ventilation supplier, has highlighted that amendments to the SAP calculation tool and requirements under the new Approved Document F mean that the company’s standard Passive Stack Ventilation (PSV) system can cut initial installation costs by over half, reduce the DER (dwelling emission rate) under SAP, and contribute towards an 83% saving in lifetime costs- whilst still helping achieve up to Level 6 under the Code for Sustainable Homes.

Dennis Bates, Passivent Domestic Product Manager, explains, “Specifiers acknowledge understanding the combination of the new Approved Document and SAP calculations can be complex. In simple terms, our PSV against a standard MVHR (mechanical ventilation with heat recovery) in a typical airtight dwelling will achieve the same DER, of 21.4, for less than half the cost!

“Even if you spend the same amount, and add gas saver and waste water heat recovery systems to the PSV, you achieve a lower DER, meaning that the amount of renewable technology required to  meet the various levels of the Code for Sustainable Homes is reduced, thus saving initial costs on the project. And because the PSV, gas saver and waste water heat recovery systems all require no maintenance, once installed they are ‘fit and forget’ solutions, yielding maintenance and repair savings of up to 83%.”

Passivent’s PSV is the only domestic ventilation strategy that uses NO electricity to function, instantly contributing towards low carbon emissions. It harnesses natural air movement principles, like a chimney, to ensure the home is adequately ventilated 24/7, 365 days a year. Passivent PSV uses planned air paths to exhaust warm, ‘used’ internal air out through the roof terminal, creating a natural draught-free ‘suction’ effect to stimulate replacement with fresh air through strategically positioned inlets. It therefore requires no operator input, cannot be switched off,  is silent in operation, and has no moving parts to service or replace.

Passivent supplies background ventilation solutions including tricklevents and through-wall ventilators, standard and ‘intelligent’ mechanical ventilation, passive stack natural ventilation and the new and innovative iHybrid, which combines natural ventilation with heat recovery to yield a 55% reduction in fan energy use and a 39% saving in lifetime costs over standard mechanical heat recovery, with its systems supported by its nationwide Mastercare scheme of approved installers. Its ability to design, supply and install all domestic ventilation solutions means it can provide authoritative, unbiased advice to the building industry to ensure new schemes comply with the new Approved Document, and all other regulatory requirements.

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