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The new Part F (2010) of the Building Regulations, came into force on 1st October, 2010

PART F (2010) In October, the new Part F will impact on the type of ventilation system for most new-builds. To attain compliance under L1A, a design infiltration rate of 5 m³/m²/hr at 50 Pa or less will normally be specified. Part F will require whole dwelling mechanical ventilation systems at these infiltration rates. This can be further complicated at design stage by the need to consider duct runs. In practice, this usually requires webbed upper floor joists to accommodate the cross runs of ducting. Please consider fire dampers, insulation to the ducting (which should be rigid ducting), and the new requirement for installer testing and certification of the system. Note also that the ventilation requirements for open flued appliances such as wood burners, will probably compromise the effectiveness of the system. Again, build quality is the key to final compliance.

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NHBC Guidance Note Part F

PART J (2010) From October the major change will be to the increased provision of ventilation for open flued room aspirated heating appliances where the design infiltration rate is 5 m³/m²/hr at 50 Pa or less. Care must be taken to reduce the effect of negative pressures in these areas.

NHBC Guidance Note Part J

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