Ventilation units should be placed as high as possible in the window or wall near any local smells and steam but not directly above eye level grills, cookers or direct sources of heat in excess of +40°C. Do not site ventilation units in areas containing excessive levels of grease without suitable filters.

In large rooms the ventilation unit extract points should be well and safely distributed to obtain even ventilation in all areas. A short circuit of airflow will be avoided by siting units as far away as is practical from the main source of air replacement.

Site the fan so that it is accessible for regular periodic cleaning and servicing. Make sure that grilles, motor cooling ports and impellers are able to function freely in accordance with guarantee requirements.

Electrical equipment should be isolated before carrying out any maintenance or cleaning. All fans should be regularly cleaned and checked every month or so, dependent on usage. Bearings should be oiled where appropriate twice a year, unless stated otherwise.