Ventec proudly introduces the FLAP DUCT®—a smart, adaptable solution in calf barn ventilation that’s engineered to meet the real needs of farmers. Designed by a veterinarian and agricultural engineer, this system gives producers greater control over air movement, temperature, and seasonal transitions, improving animal comfort and barn health year-round.

Whether you’re building new or retrofitting, the FLAP DUCT® system delivers the precision airflow needed for modern agriculture ventilation.

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FLAP DUCT® – Targeted Airflow for Calf Barns

The FLAP DUCT® is not a typical duct or agriculture fan. It’s a positive pressure system that uses high-performance fans and a fabric air tube with an internal membrane to adjust airflow based on seasonal needs.

• In cold weather, the membrane lowers, blocking large holes and delivering fresh air gently through smaller perforations at the top.
• In warm weather, the membrane rises, opening larger holes at the bottom to direct fast-moving air over calves—improving cooling and reducing fly activity.

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This system is ideal for calf barn ventilation, particularly in barns with curtain sidewalls or limited airflow control.

Available configurations:

• Tube diameters: 15” and 21”
• Fan options: 14”, 20” – ¼ HP to ½ HP
• Manual and fully automated membrane control

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The FLAP DUCT® is easy to install and integrates seamlessly into both positive and negative pressure systems.

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