HEA 11 - Ventilation requirements

Intakes and exhausts closer than stated in criteria - KBCN0120

If the location of the building’s air intakes and exhausts are closer than given in the manual, compliance can be achieved where they are designed in accordance with BS EN 13779:20071 Annex A2.  If the location of the building’s air intakes and exhausts are closer than given in the Technical Manual, it may be feasible to demonstrate compliance with the BREEAM criteria using alternative methods [eg wind tunnel studies, computational fluid dynamics (CFD) modelling]. If the alternative method demonstrates that the proposed location of intakes and extracts prevents recirculation of exhaust air under typical wind conditions, then the credit may be awarded, providing all other compliance requirements are met. If this cannot be achieved and the distance requirement is not met, then the credit must be withheld. 

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Intakes and exhausts closer than stated in criteria - KBCN0120

If the location of the building’s air intakes and exhausts are closer than given in the manual, compliance can be achieved where they are designed in accordance with BS EN 13779:20071 Annex A2. If the required distance between intakes and extracts is not achieved through design, it may be feasible to demonstrate compliance with the BREEAM criteria using CFD modelling. If CFD modelling demonstrates that the proposed location of intakes and extracts prevents recirculation of exhaust air under typical wind conditions, then the credit may be awarded, providing all other compliance requirements are met. If this cannot be achieved and the distance requirement is not met, then the credit must be withheld.

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