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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Breathe Easy, Grow Happy! 🌱

SAFETY FIRST - ETL listed motor with automatic reset to prevent overheating.
EFFORTLESS SETUP - Quick and easy installation with user-friendly locking tabs.
POWERFUL AIRFLOW - Experience a robust 195 CFM airflow for optimal ventilation.
VERSATILE APPLICATIONS - Perfect for grow tents, basements, and kitchens.
WHISPER QUIET OPERATION - Enjoy a serene environment with just 30 dB noise level.

The VIVOSUN 4 Inch Inline Duct Ventilation Fan is designed for efficient airflow and quiet operation, making it ideal for hydroponics and various indoor environments. With a powerful 195 CFM airflow and a noise level of just 30 dB, this fan ensures optimal air quality while maintaining a peaceful atmosphere. Its ETL safety certification and easy installation make it a reliable choice for any grower.

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Brand	VIVOSUN
Model Number	GDFPA-100
Color	Black
Product Dimensions	17.78 x 18.54 x 17.02 cm; 1.13 kg
Power / Wattage	28 watts
Voltage	120 Volts
Material	Plastic
Number of Speeds	1
Noise Level	42 dB
Special Features	Lightweight
Item Weight	1.13 Kilograms

VIVOSUN D4 4 Inch 195 CFM Inline Duct Ventilation Fan HVAC Vent Blower for Hydroponics Grow Tent

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