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Building Regulations - System 3

Building Regulations - System 4

Continuous Mechanical Ventilation

Continuous Mechanical Supply and Extract with Heat Recovery

Approved Document F1: 2010 England and Wales (with amendments in 2013)

Approved Document F1: 2010 England and Wales (with amendments in 2013)

Room Kitchen

Continuous Extract Rate

Room Kitchen

Continuous Extract Rate

8 l/sec 13 l/sec 8 l/sec 6 l/sec

13 l/sec

Utility Room

Utility Room

8 l/sec 8 l/sec 6 l/sec

Bathroom

Bathroom

Sanitary Accommodation

Sanitary Accommodation

● Supplies & extracts air continuously at a low rate and incorporates a boost facility to extract pollutants and supply fresh outdoor air at a higher rate as required. ● Can be controlled either; ‑ Manually boosted via multiple switches. ‑ Automatically boosted, typically via humidity, C0 2 motion or other sensors. These should be clearly marked and located in an accessible location in or near the wet rooms. ● Normally sited in a cupboard or insulated loft and ducted via rigid duct to outside air. ● Replacement air is dealt with by balanced supply and extract.

● Background Vents in dry rooms only. ● Extracts continuously at a low rate and incorporates a boost facility to extract pollutants at a higher rate as required. ● Can be controlled either; ‑ Manually boosted via multiple switches. ‑ Automatically boosted, typically via humidity, C0 2 motion or other sensors. ● Normally sited remotely in a loft space or cupboard and ducted via rigid or semi rigid duct to outside air using the most economical route. ● Replacement air enters the building via background ventilators, typically in the form of window vents located in the head of window frames or walls. These should be fitted in each habitable room except wet rooms from which air is extracted. Domestic Building Services Compliance Guide 2013 edition Referred to in the 2013 edition of Approved Document L1A and the amended version of L1B, Conservation of Fuel and Power.

Centralised system

Extract system

Supply and extract system

Domestic Building Services Compliance Guide 2013 edition Referred to in the 2013 edition of Approved Document L1A and the amended version of L1B, Conservation of Fuel and Power.

dMEV de-centralised system

Mechanical ventilation systems should be designed to minimise electric fan power. The specific fan power (SFP) should not be worse than:

Mechanical ventilation systems should be designed to minimise electric fan power. The specific fan power (SFP) should not be worse than:

SFP < 0.7 W/L/Sec FOR CONTINUOUS EXTRACT VENTILATION SYSTEMS

SFP < 1.5 W/L/Sec FOR CONTINUOUS SUPPLY EXTRACT WITH HEAT RECOVERY VENTILATION SYSTEMS

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© Crown copyright

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