We Use CookiesWe use cookies to enhance the security, performance,
functionality and for analytical and promotional activities. By continuing to browse this site you
are agreeing to our privacy policy
10 Best Inline Fans 2025 in the United States
#1
Winner
AC Infinity CLOUDLINE S8 PRO, Quiet 8” Inline Duct Fan with 10-Speed Controller, EC-Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
The AC Infinity CLOUDLINE S8 PRO is an 8-inch inline fan designed primarily for hydroponic grow rooms, but it also works well for general air circulation, exhaust, and ventilation in spaces like AV closets or bathrooms. It delivers a strong airflow of 807 CFM, which is quite powerful for its size and useful if you need to move large amounts of air efficiently. Noise is kept relatively low at 39 dB, making it quieter than many similar high-performance fans, so it won’t be overly disruptive in your home or grow space. Its EC motor is energy-efficient and produces minimal heat, helping keep electricity bills down and extending the fan’s lifespan. The build quality is solid, featuring dual ball bearings for better durability and long-term reliability.
Rating
10.0
Chosen by1,105
Airflow (CFM)
Noise Level (dB)
Energy Efficiency
Most important from
28978 reviews
#2
AC Infinity CLOUDLINE PRO S6, Quiet 6” Inline Duct Fan with Speed Controller - EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
The AC Infinity CLOUDLINE PRO S6 is a versatile 6-inch inline duct fan designed for various ventilation tasks, including grow tents, heating/cooling rooms, and hydroponics. It boasts an impressive airflow of 402 CFM, making it highly efficient in circulating air and exhausting odors. The noise level is quite low at 32 dBA, ensuring quiet operation which is ideal for indoor use.
Rating
9.7
Airflow (CFM)
Noise Level (dB)
Build Quality and Durability
Most important from
28977 reviews
#3
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
The AC Infinity CLOUDLINE PRO T4 is a versatile 4-inch inline duct fan, well-suited for hydroponic grow rooms, cooling AV closets, and transferring heating/cooling in various spaces. With an airflow capacity of 205 CFM, it efficiently ventilates areas, making it a good choice for maintaining optimal air quality and temperature control. The fan operates at a quiet noise level of 28 dBA, which is ideal for environments where noise can be disruptive, such as indoor gardening setups or residential applications.
Rating
9.7
Airflow (CFM)
Noise Level (dB)
Speed Control
Most important from
28978 reviews
Top 10 Best Inline Fans 2025 in the United States
#1
Winner
AC Infinity CLOUDLINE S8 PRO, Quiet 8” Inline Duct Fan with 10-Speed Controller, EC-Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
AC Infinity CLOUDLINE S8 PRO, Quiet 8” Inline Duct Fan with 10-Speed Controller, EC-Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
Airflow (CFM): 807 Cubic Feet Per Minute
Noise Level (dB): 39 dB
Duct Size Compatibility: 8-inch
Energy Efficiency: energy-efficient
Build Quality and Durability: dual ball bearings
Speed Control: wired 10-speed controller
Chosen by 1105 this week
AC Infinity CLOUDLINE PRO S6, Quiet 6” Inline Duct Fan with Speed Controller - EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
AC Infinity CLOUDLINE PRO S6, Quiet 6” Inline Duct Fan with Speed Controller - EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
Airflow (CFM): 402
Noise Level (dB): 32
Duct Size Compatibility: 6-inch
Energy Efficiency: 38 watts
Build Quality and Durability: Dual ball bearings, water-resistant
Speed Control: 10-speed wired controller
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
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
Airflow (CFM): 205
Noise Level (dB): 28
Duct Size Compatibility: 4-inch
Energy Efficiency: Energy Efficient
Build Quality and Durability: Mixed flow, dual ball bearings
Speed Control: PWM-controlled EC motor
AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller, EC Motor - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
AC Infinity CLOUDLINE A4, Quiet 4” Inline Duct Fan with Speed Controller, EC Motor - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics
Airflow (CFM): 165 Cubic Feet Per Minute
Noise Level (dB): 29 dB
Duct Size Compatibility: 4-Inch
Energy Efficiency: High Efficiency
Build Quality and Durability: Dual ball bearings, long-lasting
Speed Control: Wired 10-speed controller
AC Infinity Air Filtration PRO Kit 4”, CLOUDLINE Inline Fan with Controller 69, Carbon Filter Ducting Combo, Cooling and Ventilation System for Grow Tents, Hydroponics, Indoor Gardening
AC Infinity Air Filtration PRO Kit 4”, CLOUDLINE Inline Fan with Controller 69, Carbon Filter Ducting Combo, Cooling and Ventilation System for Grow Tents, Hydroponics, Indoor Gardening
Airflow (CFM): 205
Noise Level (dB): 29
Duct Size Compatibility: 4-inch
Energy Efficiency: PWM-controlled EC motor
Build Quality and Durability: Polyester, Alloy Steel
Speed Control: Yes
Related Products
Up to 30% off
VIVOSUN Smart Air Filtration PRO G6 Kit 6", AeroZesh G6 Inline Duct Fan w/GrowHub E42A Temp. Humidity WiFi-Controller, Carbon Filter & Ducting, Cooling & Ventilation System for Grow Tent, Hydroponics
VIVOSUN Smart Air Filtration PRO G6 Kit 6", AeroZesh G6 Inline Duct Fan w/GrowHub E42A Temp. Humidity WiFi-Controller, Carbon Filter & Ducting, Cooling & Ventilation System for Grow Tent, Hydroponics
Airflow (CFM): 388 CFM
Noise Level (dB): 32 dB
Duct Size Compatibility: 6"
Energy Efficiency: PWM control
Build Quality and Durability: durable materials
Speed Control: adjustable speed settings
#10
Recommended lists
Top rated
Quiet Inline Fans
How do we rank products for you?
Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.
Buying Guide for the Best Inline Fans
Choosing the right inline fan can significantly improve the ventilation and air quality in your space. Inline fans are used in various applications, including HVAC systems, grow rooms, and bathrooms. To make an informed decision, you need to understand the key specifications and how they relate to your specific needs. Here are the main factors to consider when selecting an inline fan.Airflow (CFM)Airflow, measured in cubic feet per minute (CFM), indicates how much air the fan can move. This is crucial because it determines the fan's ability to ventilate a space effectively. For small spaces like bathrooms, a lower CFM (50-100) might be sufficient. Medium-sized rooms or grow tents may require a moderate CFM (100-300). Larger areas or commercial applications will need a higher CFM (300+). To pick the right CFM, consider the size of the space and the level of ventilation required.
Noise Level (dB)Noise level, measured in decibels (dB), indicates how loud the fan will be during operation. This is important if the fan will be used in living spaces or areas where noise could be disruptive. Fans with noise levels below 30 dB are considered very quiet and suitable for bedrooms or offices. Noise levels between 30-50 dB are moderate and acceptable for most household applications. Fans above 50 dB might be too loud for some environments but could be acceptable in industrial settings. Choose a noise level that matches the tolerance of the space where the fan will be installed.
Duct Size CompatibilityDuct size compatibility refers to the diameter of the ducts the fan can connect to. This is important because it ensures the fan will fit into your existing ventilation system. Common duct sizes are 4, 6, 8, and 10 inches. Smaller ducts (4-6 inches) are typically used in residential settings, while larger ducts (8-10 inches) are more common in commercial or industrial applications. Select a fan that matches the duct size of your current setup or the size you plan to install.
Energy EfficiencyEnergy efficiency indicates how much power the fan consumes relative to the airflow it provides. This is important for reducing energy costs and minimizing environmental impact. Fans with higher energy efficiency ratings will use less electricity to move the same amount of air compared to less efficient models. Look for fans with energy-efficient motors or those labeled with energy-saving certifications. Choose an energy-efficient fan if you are concerned about long-term operating costs and environmental sustainability.
Build Quality and DurabilityBuild quality and durability refer to the materials and construction of the fan. This is important for ensuring the fan's longevity and reliability. Fans made from high-quality materials like metal or reinforced plastic are more durable and can withstand harsh conditions. Consider the environment where the fan will be used; for example, a fan in a humid area should be resistant to rust and corrosion. Choose a fan with a solid build if you need a long-lasting and dependable solution.
Speed ControlSpeed control allows you to adjust the fan's airflow to match your ventilation needs. This is important for providing flexibility and optimizing performance. Some fans come with built-in speed controllers, while others may require an external controller. Variable speed control is useful in applications where airflow needs can change, such as grow rooms or multi-use spaces. Choose a fan with speed control if you need the ability to fine-tune the ventilation.