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All PU flexible ducting hoses sizes are measured by their diameter because diameter is a very important unit of measure for the flexible hose sizing. Flexible duct hoses are normally sized according to the inner diameter and are usually labeled as ID.

The diameter of a circle is the length of a straight line from one side of the hose to the other. To measure the diameter, select two points directly opposite each other on the edge of the circle and measure the distance between the two  points.

If you any interested or questions about our Polyurethane PU flexible ducting hoses, please feel free to click contact us or email: info@eiduct.com or Mobile(WhatsApp): 00-86-187-1155-3123, or our other website: Ducting Hose, we are always here to satisfy your requirement!