Exhaust Fans

Multiply the room length, width and height to calculate the room volume in cubic metres. Multiply this volume by the recommended number of air changes per hour for the room type to estimate the required airflow.

Cubic metres per hour measures how much air the fan can move in one hour. A higher m³/h rating generally indicates greater extraction capacity.

A ceiling fan is installed directly into the ceiling, while a wall-mounted fan is fitted through an external wall. An inline fan is installed inside the duct run and can be positioned away from the room.

Bathroom, laundry and kitchen exhaust air should generally be discharged outside rather than into the ceiling cavity. The final installation should comply with applicable building and electrical requirements.

Noise is measured in decibels or dB(A). A rating around 25 to 35 dB(A) is generally considered relatively quiet, although actual noise also depends on the ducting and installation.