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 Ventilation fan D4 10,2 cm 195 pi³/min in line for hydroponic grow tent

VIVOSUN Ventilation fan D4 10,2 cm 195 pi³/min in line for hydroponic grow tent

Product ID: 647981516

Details

Brand
VIVOSUN
Colour
Black
Electric fan design
Exhaust Fan
Mounting Type
Mounting on
Power Source
Corded
Product Dimensions
17.8D x 18.5W

⚡2500 RPM brushless motor

💨195 CFM airflow

🔇30 dB ultra-quiet

Description

💨 Elevate your air game with silent power and flawless control!

WHISPER QUIET OPERATION - Operates at a barely-there 30 dB, so your focus stays uninterrupted.
POWERFUL AIRFLOW MASTERY - Delivers a robust 195 CFM to keep your grow tent perfectly ventilated and fresh.
SAFETY FIRST ENGINEERING - ETL-approved motor with automatic reset and flame-retardant components for peace of mind.
VERSATILE CLIMATE CONTROL - Ideal for grow tents, cellars, kitchens—anywhere you need precise humidity and temperature control.
EFFORTLESS INSTALLATION MAINTENANCE - Quick-lock flanges and detachable parts make setup and cleaning a breeze.

The VIVOSUN D4 10.2 cm ventilation fan combines a high-efficiency 2500 RPM brushless motor with a powerful 195 CFM airflow, all while maintaining whisper-quiet operation at 30 dB. Designed for easy installation and maintenance, it features ETL-certified safety components and flame-retardant materials, making it the perfect ventilation solution for hydroponic grow tents and versatile indoor environments.

Specifications

ASIN	B01M7S46YZ
Air Flow Capacity	195 Cubic Feet Per Minute
Best Sellers Rank	#219,431 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #186 in Ventilation Equipment
Blade Length	4 Inches
Blade Material	Plastic
Brand Name	VIVOSUN
Collection Name	Greenhouse Ventilation Equipment
Colour	Black
Connector Type	Standard socket connector
Control Method	Remote
Controller Type	Button Control
Country of Origin	USA
Customer Reviews	4.2 4.2 out of 5 stars (13,013)
Electric Fan Design	Exhaust Fan
Finish Type	Oil Rubbed
Included Components	Cord
Indoor Outdoor Usage	Indoor
Installation Type	pipe fitting
Is Product Cordless	No
Item Dimensions D x W x H	17.8D x 18.5W x 17H Centimeters
Item Weight	2.5 Pounds
Main Power Connector Type	Standard household socket connector
Manufacturer	VIVOSUN
Material Type	Plastic Metal
Model Name	GDFPA-100
Model Number	GDFPA-100
Motor Type	Brushless
Mounting Type	Mounting on the duct pipe
Noise Level	42 Decibels
Number Of Speeds	1
Number of Blades	3
Number of Packs	1
Number of Power Levels	1
Part Number	GDFPA-100
Power Source Type	Corded Electric
Recommended Uses For Product	Ventilating
Room Type	Home Office
Size	D4 4 Inch
Special Features	Specialized for grow tents
Specification Met	ETL
Speed	2500 RPM
Standby Power Shutoff	High efficiency
Style Name	base
Switch Type	Push Button
Theme	Ventilation
UPC	714119465567
Unit Count	1 Count
Voltage	120 Volts
Wattage	28 Watts

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