Purpose: This connector is used to join two rectangular duct sections with a cross-section of 220x90mm. It is often used in spaces with limited height, such as for connecting kitchen extractor hoods or in false ceiling ventilation systems.

Check Valve (Flap): The built-in flap or check valve allows air to flow in only one direction (usually outward) and prevents backflow.

Advantages:

• Prevents cold air (or hot air in summer) from entering the space when the ventilation system is off.
• Prevents the return of odors, dust, or other pollutants.
• Prevents air from the external duct from flowing back into the kitchen.

Dimensions: 220x90mm (width x height). This standard size often corresponds to a connection with an equivalent circular cross-section of approximately Φ150mm in terms of airflow, making it suitable for high-performance extractor hoods.

Material: Usually made of plastic (e.g., ABS, PVC) due to its durability, low weight, and ease of installation.

Installation: Simply connects to the ends of the corresponding rectangular ducts. It can be used in horizontal or vertical installations. This accessory is essential for the proper and efficient operation of any ventilation system using flat ducts.