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Thanks, that has clarified things for me. I have also just found an airflow conversion tool on the i-sells website which, if you enter the dimensions of the rectangular duct, calculates the diameter of compatible rigid round duct for you; 150 x 70mm equates to 115.62mm diameter round 204 x...

I had compared csa of 125mm round & 204 x & 60mm & came to the same conclusion. I then saw this site; www.i-sells.co.uk/ducting-system-125?page=2 The rectangular profile duct on this page is described as 125mm ducting system & I assume that means ok to use in place of 125mm round. It...

I don't know the answer which is why I'm asking. I'm presuming it's not as simple as calculating the volume capacity of round duct & using the same volume rectangular duct as perhaps there are other considerations when changing profile eg. length of ducting and number of bends. However as I...

I am installing a chimney cooker hood with an extraction rate of 480m/hour. Ducting runs 50cm vertically above the fan itself then horizontally 150cm to vent through an exterior wall. The manufacturer recommends using 125mm pipe ducting (fan outlet connector is 120mm) but I want to use flat...