Box Fan 40 Inch Marley Industrial Exhaust Fans, 750 Watt

Ventilation is essential to create a comfortable working environment, whether it is to bring fresh cool air into a room or remove noxious fumes or vapours. For certain activities there is a legal requirement to provide a minimum level of ventilation. The rate of ventilation for an area is normally expressed in 'air changes per hour', i.e. the number of times per hour that the entire air volume of the area is changed. The rate depends of the type of shed and the activity being undertaken. The following table lists suggested air changes per hour for some typical applications. Ventilating a simply replaces stale or foul air with clean & fresh air can be done by Exhaust fan only.