VIVOSUN 4 inch Inline Duct Fan 240 CFM HVAC Exhaust Intake Fan Low Noise & Extra Long 5.5' Grounded Power Cord

VIVOSUN inline duct fan helps with ventilation issues. This duct fan is perfect for boosting airflow in long runs of ducting. Tight precise construction eliminates rattling and reduces wear and tear to give the element a long life.