Building Regulations apply to the¬†construction of new buildings and to extensions¬†and material alterations to buildings. In addition,¬†certain parts of the Regulations apply to¬†existing buildings where a material change of¬†use takes place. Otherwise, Building¬†Regulations do not apply to buildings¬†constructed prior to 1 June, 1992.
“Ventilation is the supply of fresh outside¬†air and the removal of stale indoor air to or¬†from spaces in a building. It normally¬†comprises a combination of purpose-provided ventilation and air infiltration. The purpose provided¬†ventilation may be provided by¬†natural or mechanical means.¬†Air Infiltration is the uncontrollable air¬†exchange between the inside and outside of a¬†building through a wide range of air leakage¬†paths in the building structure.¬†Purpose-provided ventilation is the¬†controllable air exchange between the inside
and outside of a building by means of a range¬†of natural and/or mechanical devices.
The means of ventilation should be¬†capable of providing a satisfactory indoor air¬†quality for human respiration in occupied areas¬†of a building by¬†rapidly diluting pollutants, including¬†odours, and water vapour to levels¬†which do not pose direct or indirect health
risk. Removing excess water vapour from areas¬†where it is produced in significant¬†quantities, such as kitchens, utility rooms,¬†bathrooms and shower rooms so as to¬†reduce the likelihood of creating conditions¬†that support the growth of mould, harmful
bacteria, pathogens and allergens. Removing harmful pollutants from areas¬†where they are produced in significant¬†quantities.¬†providing an adequate supply of fresh air¬†for persons using an area in a building.¬†dispersing residual pollutants and water¬†vapour”.
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