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HEATING, VENTILATION & SERVICES
windows – the document shows an uplift in the amount of ventilation needing to be provided when windows are being replaced. The contractor should now be fitting background vents, usually trickle vents in the windows, whether the previous windows had them fitted or not. In new build situations, the amount of background ventilation can now be calculated in an easier way and is based on a certain amount being provided per room, rather than based on a total amount for the whole property. This currently means someone having to add this up and allow for certain additional criteria, such as floor area, number of bedrooms and airtightness level, before calculating whether the overall number of vents comply with the total required.
In new build situations, the amount of background ventilation can now be calculated in an easier way and is based on a certain amount being provided per room
When whole-house ventilation systems are being installed, there is an increase in the amount of background ventilation required when used with continuous mechanical extract systems. As before, mechanical ventilation with heat recovery (MVHR) does not need background vents, as it is a balanced, controlled ventilation system. The current Approved Document F also worked alongside a Domestic
Ventilation Compliance Guide (DVCG) document, which was designed to help contractors work to certain guidelines and then sign off their work and hand over a compliance checklist to the end user. The revised regulation does away with the DVCG, but instead includes checklists as appendices within the document, although these are still expected to be completed and handed over to the dwelling owner for their records.
Even though these changes may seem more involved, Approved Document F is much reduced in terms of page count, particularly if you were to include the DVCG too, as many of the approaches and explanations have been simplified to make compliance easier.
These revisions are all designed to continue the ongoing improvement of the quality of the UK housing stock. The increased emphasis on ventilation in both new and existing dwellings is essential, especially in the current climate where indoor air quality and the build-up of pollutants and airborne viruses is of concern to everyone more than ever.
Tyson Anderson is sales and marketing director at Titon Hardware
WWW.ARCHITECTSDATAFILE.CO.UK
ADF MARCH 2022
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