Mobi AP Aluminium Duct Reducer | 110mm to 120mm Ventilation Adapter The Mobi AP aluminium reducer is a high-quality, lightweight connector designed to join 110mm to 120mm round air ducts. Perfect for adapting duct sizes in ventilation systems where precise fitting is essential. ð¹ Size: 110mm to 120mm ð¹ Material: Lightweight, rust-resistant aluminium ð¹ Type: Round duct reducer / adapter ð¹ Application: Suitable for HVAC systems, extractor fans, bathroom and kitchen ventilation ð¹ Quick Installation: Secure with standard duct clamps or sealant A simple and reliable solution for connecting ducts of different diameters in residential or commercial air systems.