Magnetic coupler for 4 inch duct

Needed a version of this coupler that could fit 4 inch duct, without reducing the airflow

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531

updated February 11, 2025

Description

Needed a version of this coupler that could fit 4 inch duct, without reducing the airflow. Used 12 magnets instead of 6 for better hold strength.

The author remixed this model.

Made it fit 4 inch duct, without reducing. used 12 magnets instead of 6