Based on this product's specifications, here are some alternatives and similar models
Kitchen hood elbow WADEX 450/120 duct connector 450mm to 120mm
Summary description:
WADEX Kitchen Hood Elbow 450/120 is a duct connector designed to adapt a 450 mm round or rectangular hood outlet to a 120 mm circular duct. It provides a transition for kitchen ventilation systems, enabling connection between differing duct sizes. Suitable for exhaust extraction, range hood installations and retrofit ventilation projects where size reduction and airtight connection are required.