Top choice:
| Image | Name | Buy |
|---|---|---|
  | iPower 6 Inch 240 CFM Inline Duct Fan with Low Noise. Booster Exhaust for HVAC Ventilation in Grow Tent, Basements, Bathrooms and Kitchens. Portable, lightweight and easy to install in areas with little available space. Superior balanced centrifugal impeller and high strength housing for long service life. | VIEW FAN |
| Tjernlund in-Line Fan Dryer Duct Booster 4" Metal. The Current Sensing Switch is designed to turn the fan when it senses current to another device. Exhaust fan features high pressure air handling performance with low noise. The output switch rating is 120 VAC with a running frequency of 45Hz to 65Hz. | VIEW FAN |
| iPower 4 Inch Inline Duct Ventilation Fan. Download iPower Life App, connect fan via Bluetooth & WIFI, unlock remote control-set temperature. You can adjust speed, set the timer and alarm, realize fan auto operation. | VIEW FAN |
| Fantech Rn3 Radon Fan 6" Duct. It looks better on your house than the big round radon fan units. 4" PVC intake and exhaust pipe fittings which can be adapted to other pipe. That is a pretty low cost and effective solution. | VIEW FAN |
| VEVOR Inline Duct Fan, 6-Inch 400 CFM with Variable Speed Controller. Quiet AC-motor Ventilation Exhaust Fan for Cooling Booster. AC motor that ensures strong power at a low noise of 34 dB, which will not disturb your work. You can adjust the speed to meet the ventilation needs of different environments. | VIEW FAN |
| BKDFD The Best' 4Inch/6Inch Inline Duct Fan Booster Exhaust Blower Air Cooling Vent Metal Blades. Lower electricity consumption. Can be used as air intake and mounted in hydroponic tent pockets. | VIEW FAN |
| WXYNHHD Inline Duct Fan Booster Fan Plastic Waterproof Ventilation Pipe. Great for home bathroom, toilet, kitchen, garage and hydroponic, etc. A practical exhaust fan you deserve. The fans can be directly mounted into the ventilation shaft also, suitable for ceiling mounting | VIEW FAN |
| Spruce Automatic Clothes Dryer Exhaust Duct Power Ventilator Booster Fan. Increases airflow/efficiency of duct run. For 4" duct, 14-20watts. Features an Energy Star Rated RB110 Inline Fan. | VIEW FAN |
| CZDYUF Ducted Ventilating Fan, Round Duct Fan Booster 5 Inch. Exhaust Blower Vent Air Extractor Ventilation System Low Noise | VIEW FAN |