The curved boot branches off at 400mm diameter from a duct that is equal or larger than 400mm. The branch is at 90 degrees to the main with an inbuilt lead in to maintain a better airflow and reduce resistance.
Select the size of your main duct from the drop down menu.
Made from high quality galvanised steel.
Please note that product shown in the image is for illustration purposes only. The actual product supplied may differ in appearance, build or manufacturer.