Portable Mini 4 Inches Inline Duct Booster Vent Fan Blower Lightweight Practical w/ 120CFM Airflow Rate & Aluminum Fan Blade for Ventilation Home Grow Room Air Cooling Brand new Upgraded 4" Inline Duct Fan/Blower with 120CFM Airflow Rate & Aluminum Fan Blade! This portable mini duct fan is able to move air through carbon filters, long stretches of ducting or grow light reflectors. Exchange stale air with fresh air to keep temperature or humidity under control and cool your reflector with this mini blower. It's also an excellent ventilation for home use; Safe and environmental friendly Perfect for ventilation of Grow Room or air cooling of grow light reflector