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High-End Fume Hood Variable Air Volume Vav Damper System. Compact Design: World's most compact design with a height of only 13.5cm. Quick Response: Ultra-fast response time of 2.5 seconds for precise control. High Accuracy: Control accuracy exceeds 95% for optimal airflow regulation. Corrosion Resistance: Constructed with aluminum and anti-flame PP materials. Low Noise Operation: Patented multi-vane design reduces turbulence and noise. No Straight Duct Required: Simplified installation without the need for straight ducts. 2-Year Warranty: Comprehensive 2-year warranty with free accessories for defects. Fast Technical Support: Online technical support and claim handling within 1 hour.