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The Aprilaire 6616 is a round ventilation damper of the following size:
The Aprilaire 6616 Motorized Damper - 16" is a motorized damper with durable 24 gauge construction. This automatic vent damper features a position indicator for easy troubleshooting. This Aprilaire damper has a 2 wire design for easy installation.
The Aprilaire 6616 specifications: