CRANKCASE HEATER / ZR94 to ZR190

The EM-30 series are vertically mounted backdraft dampers designed to allow horizontal airflow. Model EM-30 has no flange, model EM-31 has a flange on the discharge side, and model EM-32 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 opening.

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°F)