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These penetrations must be filled before your test!\u003C\u002Fli>\n\u003Cli>- To prevent any airflow in and out of the building, all other service pipes must also be properly secured.\u003C\u002Fli>\n\u003Cli>- Skirting boards must be fitted top and bottom.\u003C\u002Fli>\n\u003Cli>- Make sure there are no gaps behind all units, such as kitchen units and baths\u003C\u002Fli>\n\u003Cli>- Loft hatches sealed.\u003C\u002Fli>\n\u003Cli>- There must be a standard size door in the property\n\u003Cul>\n\u003Cli>- Systems specifically designed for ventilation purposes are not included in this test. Our engineers tape all extractor fans, chimneys, MVHR units, etc. Overall, this will give you an accurate score that you can rely on.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>&nbsp;\u003C\u002Fp>\n\u003Cp>\u003Cstrong>How's it actually done? \u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>A qualified engineer will set up a momentary fan in the doorway, ensuring all internal doors are opened, temporary seal trickle vents and any other openings are closed. By increasing or decreasing pressure, we can then measure the differential pressure. The total air flow required to attain a pressure differential of 50 Pa, which is calculated and divided by the total building envelope area. This then provides the leakage rate of m³\u002Fh.m² @ 50 Pa. 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