Select the fan mounting type that best
suits your installation. (Note that kitchen exhaust applications in
all instances and bathrooms and toilets in some cases require the
exhaust air to be vented to outside - Refer to "The
Regulations")
Air Change Rate refers to the number of
times the air should be changed per hour for a given room type. The
air change rates used are nominated to meet Australian Standards and
recommended practice.
Room volume must be determined so that
the amount of air flow required to achieve the air change rate in
the room may be calculated. (Air Volume (m3/h) = Air Change Rate per
Hour (ACH) x Room Volume (m3)).
Volume of room is calculated by
Calculating L shaped rooms is a simple matter of addition.
Volume of room is calculated by 
