Models combine stationary louver blades and operable damper blades into one common frame member. Damper blades can be closed for tight air shut off. Frame depths in 2, 4 and 6 in.
See the attached Technical Comparison Chart.
Model ECD has exposed linkages. Models EAC, EACC, and EACN have concealed linkages. Electric, pneumatic, or manual operation. Concealed actuator in the sill member is available. (Model EACC must have an electric actuator.)
Gravity operation allows airflow in one direction and prevents reverse airflow. GCE is designed for exhaust flow, while GCI is designed for intake. Note: These units must be mounted in direct proximity to an exhaust or intake fan. Frame depths: GCE and GCI - 2, 4 in.
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