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

Vivosun D4 4 Inch 195 Cfm Inline Duct Ventilation Fan

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

💨 Cool your space, not your vibe — stay fresh, stay ahead!

SAFETY FIRST DESIGN - ETL-listed motor with automatic reset and flame-retardant housing for peace of mind.
TURBOCHARGED AIRFLOW - Powerful 195 CFM moves air fast to keep your space fresh and cool.
WHISPER QUIET OPERATION - Engineered with flow deflectors to minimize noise at just 30 dB—work or relax undisturbed.
VERSATILE CLIMATE CONTROL - Perfect for grow tents, basements, kitchens, or gaming rigs—control humidity, odors, and heat like a pro.
EFFORTLESS SETUP MAINTENANCE - Tool-free flange locks and detachable blades make installation and cleaning a breeze.

The VIVOSUN D4 4 Inch Inline Duct Ventilation Fan delivers a robust 195 CFM airflow at 2500 RPM, ensuring efficient ventilation for grow tents, basements, kitchens, or gaming setups. Operating quietly at 30 dB thanks to advanced flow deflectors, it features an ETL-listed motor with automatic reset for safety and flame-retardant components. Easy to install with locking flanges and simple maintenance, this fan is a reliable, versatile solution to optimize air quality, temperature, and humidity in your space.

Specifications

ASIN	B01M7S46YZ
Air Flow Capacity	200 Cubic Feet Per Minute
Best Sellers Rank	#8,866 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #5 in Greenhouse Ventilation Equipment
Blade Length	4 Inches
Blade Material	Plastic
Brand	VIVOSUN
Brand Name	VIVOSUN
Cable Length	5.9 Feet
Collection Name	Inline Duct Fans
Color	Black
Control Method	App
Controller Type	Button Control
Customer Reviews	4.3 out of 5 stars 13,564 Reviews
Electric Fan Design	Blower
Electric fan design	Blower
Finish Type	Oil Rubbed
Included Components	Cord
Indoor Outdoor Usage	Indoor
Installation Type	plug-and-play
Is Electric	Yes
Is Product Cordless	No
Item Dimensions D x W x H	7"D x 7.3"W x 6.7"H
Item Weight	2.5 Pounds
Manufacturer	VIVOSUN
Material	Plastic
Model Name	VIVOSUN Inline Fan
Model Number	GDFPA-100
Motor Type	brushless
Mounting Type	Wall Mount
Noise Level	42 Decibels
Number of Blades	3
Number of Power Levels	1
Number of Speeds	1
Part Number	GDFPA-100
Power Source	Corded Electric
Product Dimensions	7"D x 7.3"W x 6.7"H
Recommended Uses For Product	Ventilating
Room Type	Kitchen
Size	4 Inch
Smart Home Compatibility	Not Smart Home Compatible
Special Features	Lightweight
Specification Met	ETL
Speed	2500 RPM
Standby Power Shutoff	High Efficiency
Style	Basic
Switch Type	Toggle
UPC	714119465567
Unit Count	1.0 Count
Voltage	120 Volts
Warranty Description	Manufacturer Warranty for 360 days from date of purchase.
Wattage	28 watts

Reviews

F**R

31.08.2021

B**K

20.09.2025

E**D

13.01.2024

M**K

5.09.2022

J**J

10.12.2025

W**R

17.09.2025

D**H

14.05.2025

J**.

31.08.2019

G**Z

27.04.2023

O**T

26.04.2025

D**U

25.04.2024

J**E

25.02.2025

A**R

28.11.2025

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VIVOSUN D4 4 Inch 195 CFM Inline Duct Ventilation Fan, HVAC Vent Blower for Grow Tent, Attic, Basements or Kitchen, Hydroponics Exhaust Booster Fan

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