It would be a bad idea to fill it at all. It is there to provide air changes and will help avoid problems with condensation and the resulting mould growth that often occurs when you have insufficient air movement. This is often a problem in bedrooms as we produce a lot of moisture simply by breathing. Kevin Gregory Gregory Residential Ltd reallymoving comment: Make sure that you employ the advice of a Chartered Surveyor before making any major alterations to your property. You can get quotes for surveyors here.
Gregory Residential Ltd
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