In the past few weeks, we’ve taken a look at a number of the UK’s building regulations; those that relate directly to installations. Here, we’re going to explore another key regulation: Part F.
Put simply, Part F requires that a ventilation system capable of limiting the accumulation of moisture be installed, in order to remove any potential health hazards and to stop the growth of mould and prevent pollutants from filling the area.
(In this case, ventilation is classed as the removal of stale air from the environment and its replacement with fresh outside air).
Ventilation is a necessary provision for four main reasons:
There are a number of techniques for ensuring that any building achieve the necessary criteria. Typically, a ventilation system capable of meeting the regulations should be able to:
Typically, modern buildings will use a combination of infiltration and purpose-provided ventilation:
Section 4.12 of Part F states that, where possible, it is always preferable to minimise uncontrollable infiltration and emphasise sufficient purpose-provided ventilation.
A reasonably high level of air tightness should be achieved in the building - a level significantly higher than the minimum standards recommended in Building Regulations Part L.
(All new buildings are expected to better the target values for air tightness).
Within Part F, a three-pronged strategy is recommended as the approved method. The focus of any design should be as follows:
The above strategy can be delivered by either a natural or mechanical ventilation system (or a combination of both) but any installation that will aid the process is encouraged.
(Our electric-operated opening skylights, for instance, can play a key part in aiding the ventilation process).
It’s recommended that any ventilation systems installed in both new and existing dwellings be installed in keeping with the 2010 edition of the Domestic Ventilation Appliance Guide. It’s also necessary where ducting passes through a fire-resisting wall, floor or fire compartment, that the required measures remain in-keeping with Part B of the Building Regulations.