Flat duct connector with non-return valve AWENTA KP55-22 for 55 × 110 mm rectangular ducts

AWENTA flat duct connector KP55-22 is designed to join 55 × 110 mm rectangular ventilation ducts while providing integrated backflow protection. The unit combines a low-profile connection flange for flat duct runs with an internal non-return valve that permits airflow in the intended direction and closes to prevent reverse flow. Constructed for HVAC and ventilation systems, this connector fits within ducts of the specified cross section and supports straightforward inline installations in residential and commercial environments.

Advantages

The connector integrates a non-return valve into a compact flat profile, saving space where duct height is limited. Its design ensures directional airflow control without additional external dampers, reducing the number of components required in a ventilation line. The product is compatible with standard 55 × 110 mm rectangular ducts, enabling consistent sealing and alignment for reliable airflow performance. Materials and assembly geometry are chosen to provide stable operation and ease of handling during installation.

Suitable for

• Connecting 55 × 110 mm flat rectangular ventilation ducts
• Residential exhaust and supply ventilation where backflow must be prevented
• Commercial HVAC sections with limited vertical space
• Retrofit installations requiring an in-line non-return solution

Key specifications

• Compatible duct cross section: 55 × 110 mm rectangular
• Integrated non-return (check) valve to prevent reverse airflow
• Flat/low-profile connector geometry for limited duct height
• Designed for inline installation in ventilation and HVAC systems
• Suitable for residential and commercial applications

How to use

Position the connector between two matching 55 × 110 mm rectangular duct sections so that the airflow direction aligns with the valve orientation. Secure the connector to each duct end using appropriate fasteners or clamps and seal the joints with HVAC-approved tape or sealant to ensure airtight connections. Verify that the non-return valve moves freely and closes when airflow reverses. After installation, run the ventilation system and inspect for proper directional flow and any air leakage at the joins.

Usage recommendations

Install the connector in horizontal or slightly inclined runs where the valve blade can operate without obstruction. Avoid placing heavy loads on the connector and ensure the surrounding ductwork supports the assembly. Periodically inspect the valve for dust or debris buildup and clean as needed to maintain reliable operation. Use compatible sealing materials and standard installation practices for rectangular ductwork.