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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Description

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

SAFETY FIRST DESIGN - ETL-approved motor with automatic reset and flame-retardant components ensures worry-free, reliable performance.
WHISPER QUIET OPERATION - Maintain focus and calm with noise levels as low as 30 dB—quiet enough for any professional workspace.
POWERFUL 195 CFM AIRFLOW - Turbocharge your grow tent ventilation with a robust 2500 RPM motor delivering optimal air circulation.
VERSATILE CLIMATE CONTROL - Perfect for grow tents, home offices, kitchens, and cellars—control humidity, temperature, and odors with ease.
EFFORTLESS INSTALLATION MAINTENANCE - Quick-lock flanges and detachable blades make setup and cleaning a breeze—no downtime, just fresh air.

The VIVOSUN D4 4-inch inline ventilation fan delivers a strong 195 CFM airflow at 2500 RPM while operating quietly at 30 dB. ETL-certified for safety with automatic reset and flame-retardant parts, it features easy installation with locking flanges and detachable blades for maintenance. Ideal for hydroponic grow tents and versatile indoor use, it efficiently controls temperature, humidity, and air quality in compact spaces.

Specifications

Brand	VIVOSUN
Colour	Black.
Electric fan design	Exhaust Fan
Power Source	Corded Electric
Style	base
Product Dimensions	17.8D x 18.5W x 17H Centimeters
Room Type	Home Office
Special Feature	Lightweight
Recommended Uses For Product	Ventilating
Noise Level	42 dB
Wattage	28 Watts
Finish Type	Oil Rubbed
Number of Blades	3
Air Flow Capacity	195 Cubic Feet Per Minute
Blade Length	4 Inches
Speed	2.5E+3 RPM
Voltage	120 Volts
Switch Type	Push Button
Item Weight	2.5 Pounds
Indoor/Outdoor Usage	Indoor
Model Name	GDFPA-100
Specification Met	ETL
Control Method	Remote
Efficiency	High efficiency
Is It Cordless?	No
Number of Power Levels	1
Main Power Connector Type	Standard household plug
Manufacturer	VIVOSUN
UPC	714119465567
Size	D4 4 Inch
Item model number	GDFPA-100
ASIN	B01M7S46YZ

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