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110x55mm to Ø 100mm / 4.33 x 2.17 inch to Ø 4 inch - Rectangular to Round Adapter Equipped with a Flange to Stabilise The Ventilation System Non-corrosive / Lightweight / Excellent airflow characteristics Made of High-quality PVC Plastic / Temperature Range: From -5°C to +60°C Easy to install and durable, just push-fit duct and fittings together