Is my fan defective? For such a small fan it is extremely loud.

Use light weight clipper oil on the moter behind fan blades, also use tape to hold to pieces together after twisting back together. I own three need to add oil to all. All have been running non stop for over 6 months.

Can you attach a variable speed controller to this

You can, however, with just 200 CFM of air movement you may want to just keep it on full. The motor will make more humming noise if you use a speed controller to decrease speed. I found it makes less noise on full than it does if you decrease the speed which increases motor hum noise considerably.

If i use this fan as my exhaust fan for my 3ft×3ft×6ft grow tent, and use the cheaper less powerful 100cfm as an inline fan would that suffice?

Hey man i dont know where you live? But im in new england and heat is usaully temporary problem for a few months. But the 4 in didnt cut it i ended up buying the 6 inch kit with carbon filter and still have the 4 inch. This year is brutal and glad i switched in april. Honestly i would get the 6 or even the 8 with adjustable speed. I struggled to justify the costs myself but its gonna save money down the line and You will have room for lose of efficency with bends and dirty blades. But hey everyone journey is different. Its just cheaper to go bigger then at the minimum CFM or btu or any hvac project. It wont work as hard and run hard at 100% power

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VIVOSUN Inline Duct Fan 100 mm Extractor Fan 331 m³/h for Ventilation Systems, HVAC Extractor Fan for Hydroponics and Grow Tents

VIVOSUN Inline Duct Fan 100 mm Extractor Fan 331 m³/h for Ventilation Systems, HVAC Extractor Fan for Hydroponics and Grow Tents

Product ID: 261686506

Details

Brand
VIVOSUN
Colour
Black
Electric fan design
Exhaust Fan
Mounting type
Duct Mount
Power source
Corded
Product dimensions
17.8D x 18.5W

💨195 CFM airflow

🔇30 dB ultra-quiet

🔥ETL safety & auto-reset

Description

💨 Elevate your airflow game—quiet, powerful, and safe ventilation that keeps you ahead of the curve.

SAFETY FIRST DESIGN - ETL-listed motor with automatic reset and flame-retardant housing ensures your setup stays safe and reliable 24/7.
WHISPER QUIET OPERATION - Enjoy near-silent 30 dB performance thanks to advanced flow deflector tech—no distractions, just pure airflow.
POWERFUL 195 CFM AIRFLOW - Turbocharge your ventilation with a robust 2500 RPM fan that keeps your grow tent or room fresh and perfectly climate-controlled.
VERSATILE CLIMATE CONTROL - Perfect for hydroponics, grow tents, basements, or kitchens—reduce humidity, block odors, and maintain ideal temperatures.
EFFORTLESS INSTALLATION MAINTENANCE - Quick-lock flanges and a 5.9-foot cord make setup a breeze, while detachable blades simplify cleaning.

The VIVOSUN Inline Duct Fan 100 mm delivers a powerful 195 CFM airflow at 2500 RPM with whisper-quiet 30 dB operation. ETL-listed for safety with an automatic reset motor and flame-retardant housing, it’s designed for easy installation and maintenance. Ideal for hydroponics, grow tents, and general ventilation, it efficiently controls humidity, temperature, and air quality to optimize your environment.

Specifications

ASIN	B01M7S46YZ
Air Flow Capacity	195 Cubic Feet Per Minute
Best Sellers Rank	213,977 in Garden ( See Top 100 in Garden ) 104 in Hydroponic Ventilation Equipment
Blade Length	4 Inches
Blade Material	Plastic
Brand Name	VIVOSUN
Cable Length	5.9 Feet
Collection Name	Greenhouse Ventilation Equipment
Colour	Black
Connector Type	Standard wall outlet connector
Control Method	Push Button
Controller Type	Button Control
Customer Reviews	4.2 4.2 out of 5 stars (12,976)
Electric Fan Design	Exhaust Fan
Finish Type	Powder Coated
Included Components	Cord
Indoor Outdoor Usage	Indoor
Installation Type	Cloth Mount
Is Electric	Yes
Is Product Cordless	No
Item Dimensions D x W x H	17.8D x 18.5W x 17H centimetres
Item Weight	1.13 kg
Main Power Connector Type	Standard household electrical outlet connector
Manufacturer	VIVOSUN
Material	Plastic
Model Name	GDFPA
Model Number	GDFPA-100
Motor Type	brushless
Mounting Type	Duct Mount
Noise Level	42 Decibels
Number of Blades	3
Number of Power Levels	2
Number of Speeds	1
Part Number	GDFPA-100
Power Source	Corded Electric
Recommended Uses For Product	Air Circulation, Ventilating
Room Type	Kitchen
Size	D4 4 Inch
Smart Home Compatibility	Not Smart Home Compatible
Special Features	High Velocity, Waterproof
Specification Met	ETL
Speed	2500 RPM
Standby Power Shutoff	High Efficiency
Style	Industrial
Switch Type	Push Button
UPC	714119465567
Unit Count	1.0 count
Voltage	120 Volts
Wattage	28 watts

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