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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💨 Elevate your airflow game—quiet, powerful, and safe ventilation that means business.

TURBOCHARGED AIRFLOW - Delivers a powerful 331 m³/h (195 CFM) to keep your grow space fresh and thriving.
BUILT IN SAFETY SHIELD - ETL-listed motor with automatic reset prevents overheating and guarantees peace of mind.
WHISPER QUIET OPERATION - Operates at just 30 dB, ensuring zero disruption to your workflow or relaxation.
VERSATILE CLIMATE CONTROL - Perfect for grow tents, basements, kitchens—reduces humidity, odors, and heat efficiently.
EFFORTLESS INSTALLATION MAINTENANCE - Quick-lock flanges and detachable housing make setup and cleaning a breeze.

The VIVOSUN Inline Duct Fan is a compact, ETL-certified ventilation powerhouse delivering 331 m³/h airflow at whisper-quiet 30 dB noise levels. Designed for hydroponics, grow tents, and HVAC systems, it features a flame-retardant housing, automatic motor reset for safety, and easy installation with quick-lock flanges. Ideal for controlling temperature, humidity, and air quality in any indoor environment.

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Product Dimensions	17.78 x 18.54 x 17.02 cm; 1.13 kg
Finish types	Oil Rubbed
Specification met	ETL
Batteries required	No
Included components	Cord
Item weight	2.5 Pounds

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

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