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The Broan 427 is a 4-1/2 x 18-1/2 to 10 round thin wall horizontal transition duct. This component is essential for any HVAC system requiring effective ventilation and airflow management. Its design supports proper transition from rectangular to round duct configurations.
This transition duct is used in residential and commercial ventilation systems. It allows for flexible duct arrangement to enhance airflow efficiency.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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