What duct sizes are compatible with the Kenmore 233 range hood?
The Kenmore 233 range hood is compatible with 7-inch round ductwork as well as a rectangular transition duct measuring 3¼" x 10" (8.3 cm x 25.4 cm). For example, 200 feet of 7" round ductwork will function at approximately 80% airflow efficiency. (Page 2)
From the official Kenmore 233 Range Hood manual, page 2
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