Square to Round Vent Adapter

A custom-designed ventilation adapter that converts a 145x145 mm square opening into a round duct connection with an outer diameter of Ø135 mm and an inner diameter of Ø120 mm. This design is optimized for fitting over or into flexible ducting, depending on the application, while maintaining a smooth internal airflow path. Ideal for use with portable air conditioners, fan coils, or general exhaust ventilation where a square wall vent needs to connect to a round hose. 🔧 Specifications: Square side: 145 x 145 mm Round outer diameter: Ø135 mm Round inner diameter: Ø120 mm Wall thickness: ~7.5 mm (depending on model) Type: Square to round transition adapter ⚙️ Features: Smooth airflow transition (reduced turbulence) Strong wall thickness for durability Compatible with flexible ducts (slip-fit or over-fit) Easy to install and remove