The size of the ducting depends on the airflow requirements of your system. It is important to consult with a professional or refer to the manufacturer’s guidelines to ensure proper sizing.

Yes, flexible ducting can be used for kitchen extractor fans, but it is important to choose a ducting material that is heat-resistant and suitable for kitchen environments.

Regulations for ducting installation can vary depending on the type of system and location. It is important to follow building codes and standards, and to consult with a professional if necessary.