ONVEAN 4 Inch Inline Duct Fan with Speed Controller, Upgraded Inline Fans High-Efficiency Exhaust Duct Fan, Low Noise HVAC Ventilation in Basement Bathroom Workshop Attic Grow Tent

Why it's a great deal

• [Quiet & Efficient Airflow] This 4-inch inline duct fan delivers powerful airflow up to 183 CFM while operating as quietly as 24 dB. Featuring stepless speed control, it allows precise adjustment for optimal performance and noise balance. Perfect for quickly removing bathroom humidity, grow tent odors, and stale attic air. Comes with a 5 ft power cord for fast and easy installation.

• [Pure Copper DC Motor & High-Efficiency Airflow]Featuring a 100% pure copper DC motor, this inline duct fan spins at 5000RPM with <20K temperature rise. Compared to aluminum motors, its 30% better heat dissipation and 50% lower energy use make this inline exhaust fan durable and reliable for heavy-duty needs.

• [Durable, Safe & Versatile Use] Built with sturdy ABS housing and PBT blades, this 4-inch inline duct fan is waterproof (IPX4), durable, and resistant to deformation. Equipped with a wide-voltage power adapter, low-voltage safety system, and stall plus overheat protection, it ensures stable and secure performance. Ideal for quietly ventilating grow rooms, bathrooms, kitchens, attics, basements, and workshops—enhancing airflow and comfort effortlessly.

• [Easy Installation & Multi-Scene Ventilation] This 4-inch inline duct fan can be easily mounted on walls, windows, or ceilings with simple installation. Compact yet powerful, it’s ideal for use with 3D printers, laser engravers, fog machines, kitchen cabinets, fireplace vents, bathroom ceilings, garages, greenhouses, and RV ventilation. With a 3.86-inch fan size that perfectly fits standard 4-inch ducts, it efficiently removes heat, moisture, and odors to keep the air fresh and well-circulated.

• [High Quality & 24/7 Support Inline Fan]Tested to strict standards, this 4 inline fan includes a 2-year warranty and 24/7 customer service. No need to return—contact us for any issues! (Note: Duct not included.)