4 inch Exhaust Fan Metal Iron Ventilation Extractor, Silence with Anti-backflow Check Valve Window and Wall Mount Vent Fans for Home Office Kitchen Bathroom Grow Tent Garage

Amazon.com: AC Infinity CLOUDLINE PRO T4, Quiet 4” Inline Duct Fan with Temperature Humidity VPD Controller, WiFi Integrated App Control - Ventilation Exhaust Fan for Heating Cooling, Grow Tents, Hydroponics : Patio, Lawn & Garden

Hon&Guan 4 Inch Inline Booster Duct Fan with Speed Controller - 130 CFM Airflow with 6W Ultra-Low Power and Low Noise

Browse the top-ranked list of 4-inch fans below along with associated reviews and opinions. Place this Keystone 7" Convertible Desk Fan on your desk for improved airflow in your office. The rotary dial lets you set the speed, and the full tilt lets you focus air on specific parts of the room to mitigate hot spots.

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The new Cloudline series contains a cutting-edge electronically commutated (EC) motor, controlled using precise electronic pulses and smart programming. This enables the inline fan to operate considerably quieter and reach low speeds without generating noise or heat.

The Holmes 4" USB-Powered Personal makes cooling your personal space a breeze. This small, yet powerful portable fan is ideal for use on tabletops, desks or and dorm rooms. With a 360° adjustable head tilt, you can direct the airflow wherever you need it most. This compact fan includes an easy-to-use single speed option and sturdy support base.

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Manufactured in Canada, the Vortex Powerfans In-Line Duct Blowers are ideal for use in general purpose exhaust and duct boosting applications. The VTX models range from 175 CFM to 1140 CFM and the V-Series models range from 2050 CFM to 4515 CFM.

Holmes 4” USB Rechargeable Clip Fan offers compact and versatile cooling wherever you need it. Designed for portability, it can be easily charged via USB and clipped onto strollers, shelves, tabletops, or desktops for hands-free cooling. With a 360-degree adjustable head tilt, you can direct airflow exactly where needed.