Ventilation Testing

Ventilation Testing

All residential new build & conversion projects forming new dwellings will require ventilation testing.

There are 5 different ventilation types, ranging from simple background and intermittent fans, to whole house mechanical extract systems with heat recovery. These are labelled as ‘Systems 1 – 5’.

Part F testing validates air flow measurements for the new dwelling and ensures that the system has been configured correctly. Testing should be carried out using UKAS calibrated equipment.

All kitchen intermittent extractor fans must extract at least 30 litres of air per second. If an intermittent extractor fan in the kitchen is not adjacent to a hob, it must extract air at least 60L p/s. All continuous extraction units in the kitchen must extract at least 13L of air p/s.

For bathrooms, the extraction rate of an intermittent extraction unit must extract at least 15L of air p/s, or 8L p/s for continuous extraction units.

Intermittent extraction units in utility rooms must extract at least 30L of air p/s, or at least 8L of air p/s for continuous extraction units.

The dwelling must have an adequate overall ventilation standard rate. This will depend on the number of bedrooms. For example, in 1-bedroom properties the overall standard ventilation rate must be 13L p/s. However, in 5-bedroom properties this rate must be 29L p/s for 5-bedroom properties.

One Stop Consult can arrange water efficiency calculations within 7 working days from instruction.

If your new commercial premises is over 50m2, you will need an SBEM assessment as a mandatory requirement. Some extensions and renovations will also need an SBEM assessment, although there are some exceptions such as places of worship and unheated buildings.

An SBEM assessment comes in two parts. The design stage SBEM assessment is the first part which needs to be completed before construction starts. The second stage is when the building is completed. This is called an as-built SBEM and will also include the results of the air tightness test (if completed). An Energy Performance Certificate (EPC) can then be issued.

One Stop Consult can arrange water efficiency calculations within 7 working days from instruction.


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