First Duct is a well-known brand specializing in industrial flexible ducting solutions, particularly PU (Polyurethane) Ducting. 

PU Ducting, short for Polyurethane Ducting, is a type of flexible duct made from polyurethane material. It is lightweight, highly flexible, abrasion-resistant, and often used for conveying air, dust, powders, or light solids in industrial applications such as woodworking, chemical plants, and HVAC systems.