Galvanised ducting for commercial range hoods

Why use galvanised ducting for a commercial range hood?

Galvanised ducts and pipes can be used to build rigid ductwork for extracting air from a commercial range hood. Galvanised steel is particularly suitable for ventilation ductwork thanks to its rigidity and resistance to corrosion.

Spiral galvanised ducts can be combined with elbows, reducers, tees, fittings and clamps to create ductwork suited to the layout of the installation.

What duct diameter should you choose for a commercial range hood?

The duct diameter must be suitable for the required extraction airflow. A duct that is too small increases air velocity, noise and pressure losses and can reduce the performance of the extraction system.

As a general guide, we usually use the following duct diameters according to the required airflow:

• Ø125 mm: approximately 500 to 700 m³/h;
• Ø160 mm: approximately 800 m³/h;
• Ø200 mm: approximately 1,200 m³/h;
• Ø250 mm: approximately 1,800 m³/h;
• Ø300 / 315 mm: up to approximately 2,500 to 3,000 m³/h;
• Ø355 mm: approximately 3,500 m³/h;
• Ø400 mm: approximately 4,000 m³/h.

These figures are indicative: duct length, the number of elbows and changes in diameter also affect pressure losses and the actual airflow.

How to build an extraction system with galvanised ducting

To reduce pressure losses, keep the ductwork as direct as possible and avoid unnecessary reductions in diameter. Elbows, fittings and clamps should be selected to match the diameter of the ductwork.

For installations with a remote fan motor, a flexible connector can also be used to reduce the transmission of vibrations between the fan and the rigid ductwork.

Need help choosing your ductwork?

Send us the motor airflow, duct length, number of elbows and available diameter. We can then recommend the appropriate galvanised duct diameter for your installation.