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The EM-40 series are horizontally mounted backdraft dampers designed to allow vertical airflow down and prevent reverse airflow up. Model EM-40 has no flange, model EM-41 has a flange on the discharge side, and model EM-42 has a flange on the intake side. All dampers in this series open by air pressure differential and close by gravity. This series includes adjustable counterbalance weights to assist closing.

• Aluminum construction
• Pressure: Up to 10 in. wg (2.5 kPa)
• Velocity: 2500-3500 fpm (13-18 m/s)
• Temperature: Up to 180°F (82°C)