Guidance on the Control of Odour and Noise from ... - Defra

• Air being drawn from dirty areas; and
• Draughts and discomfort during cold weather
Natural systems cannot provide targeted ‘cooling’ to staff working adjacent to
canopies. Make-up air can be introduced into a kitchen by means of:
• the canopy;
• ventilated ceiling;
• HVAC system; or
• combination of the above.
A range of extraction/make up air hoods are available. The choice of hood will be
dictated by the application. Whichever system is chosen due regard should be given
to potential noise issues arising from the make up air system (fans, duct work, grilles,
noise breakout etc).
Where a kitchen relies on a natural make-up air system, its resistance must be taken
into account when calculating the overall system resistance against which the
extraction fan will operate. In such a system, restaurant operators may rely on open
doors and windows within the kitchen area to supply natural make up air. During
summer months this may give rise to odour and noise problems for receptors living
adjacent to the kitchen area or, allow the ingress of pests into the food areas.
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