Black YIYOSUN 4-inch inline duct fan with red impeller, variable speed controller for grow tent ventilation.

Black YIYOSUN 4" inline tube duct fan with specifications label and variable speed controller, ideal for grow tents.

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Exploded view of black inline duct fan, highlighting internal motor, red fan blades, and removable ends.

Energy-efficient black inline duct fan with red air inflow, blue air outflow for room ventilation & odor purification.

Black inline fan speed controller with rotary knob showing OFF, ON, L, M, H settings for stepless speed regulation.

Red-bladed inline grow tent ventilation fan displaying 30 dB, with a low noise level comparison chart.

VIVOSUN R4 Inline Fan w/ Variable Speed Controller - 4" Duct

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~~$89.99 USD~~ $79.99 USD$89.99 USD

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MODEL: WEB-306201P-4

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VIVOSUN R4 Inline Fan w/ Variable Speed Controller - 4" Duct

Struggling to manage heat and stale air in your grow space without adding disruptive noise? The VIVOSUN R4 4" Inline Fan is the solution, delivering powerful, whisper-quiet ventilation that you control. This versatile fan is an essential component for any indoor cultivation setup, from a small starter grow tent kit to more advanced multi-plant rooms, ensuring your environment remains optimal for healthy growth.

Engineered for performance, the R4 moves an impressive 190 CFM of air at 2300 RPM, efficiently exchanging the air in your grow tent. The included variable speed controller gives you precise command over your environment, allowing you to dial in the perfect airflow for every stage of growth. Despite its power, this fan operates at a nearly silent 31 dB, so it won't disturb your home. It's an ideal choice when building out your own VIVOSUN air filtration system, pairing perfectly with a 4" carbon filter to eliminate odors.

The durable plastic housing features removable duct ends with secure locking tabs, making installation and maintenance a breeze. With a 5.9-foot power cord and an energy-efficient 59-watt motor, this fan from VIVOSUN is built for continuous, 24/7 operation in ambient temperatures up to 104°F (40°C).

Features

VIVOSUN R4 Inline Fan w/ Variable Speed Controller - 4

💨

Powerful Airflow

Delivers a steady 190 CFM at 2300 RPM for effective ventilation.

🔇

Ultra-Quiet Operation

Operates below 31 dB thanks to its durable, low-vibration plastic housing.

🎛️

Variable Speed Control

Precisely adjust fan speed from low to high with the included controller.

🔧

Easy Installation

Features removable duct ends with locking tabs and a 5.9-foot power cord.

Specifications

Specification	Value
Duct Size	4 Inch
Airflow	190 CFM
Fan Speed	2300 RPM
Noise Level	<31 dB
Power Consumption	59 W
Current	0.8 Amps
Power Supply	110/120 V
Material	Plastic
Weight	5.15 lbs
Max Ambient Temperature	104°F / 40°C
Cord Length	5.9 feet
Package Dimensions	12.4 x 8.7 x 8.4 inches

Compare VIVOSUN Inline Fans

Feature	VIVOSUN R4	VIVOSUN R6	VIVOSUN R8
Duct Size	4"	6"	8"
Airflow (CFM)	190	390	720
Fan Speed (RPM)	2300	2450	2550
Noise Level	<31 dB	<38 dB	<45 dB
Power (Watts)	59W	65W	135W

Support & Manuals

📄VIVOSUN R4 Fan Manual

Warranty

The VIVOSUN R4 Inline Fan includes a 1-year after-sale service coverage and offers a free return within 30 days of delivery for your peace of mind.

FAQs

How does the variable speed controller work?+

The included controller allows you to adjust the fan's speed seamlessly from its lowest setting up to the maximum 2300 RPM. Simply turn the dial to increase or decrease airflow, giving you total control over your grow environment's ventilation.

Is this fan suitable for a 4'x4' grow tent?+

Yes, the R4's 190 CFM airflow is an excellent choice for ventilating 4x4 grow tents and similar-sized spaces. It provides sufficient air exchange to control heat and humidity, and the variable speed function lets you adapt to your plants' needs. For a complete package, consider our 4-plant smart grow kits.

How quiet is the R4 fan during operation?+

The VIVOSUN R4 operates at less than 31 dB, which is quieter than a whisper. The durable plastic housing and balanced fan blades are designed to minimize vibration and noise, making it perfect for residential use without being a nuisance.

What makes the VIVOSUN R4 easy to install?+

Installation is straightforward thanks to its removable duct ends with secure locking tabs, which allow for quick connection to standard 4" ducting. The long 5.9-foot power cord also provides flexibility in where you can position the fan.

Can this fan run 24/7 in a warm environment?+

Absolutely. The R4 is designed for continuous, 24/7 operation in ambient temperatures up to 104°F (40°C). Its energy-efficient motor consumes only 59 watts, ensuring reliable performance without high electricity costs.

What are the best applications for this inline fan?+

The R4 is a versatile fan ideal for horticultural, industrial, and household applications. It excels at ventilating grow tents, circulating fresh air, and as part of an exhaust system with a carbon filter to remove odors. It's a key piece of equipment discussed in our complete grow room setup guide.

Shipping & Returns

Order Processing & Shipping

We currently ship within the United States only. No international shipping is available at this time.

Order Processing:

Most orders are processed within 24-48 hours after being placed.

Some products may have extended processing times of 7-14 business days or more, which will be clearly indicated on the product page. If your order includes such items, you will receive an email from our team or be contacted directly to confirm the estimated shipping timeframe.

Shipping Times:

We partner with reliable national carriers to deliver your orders. While specific delivery times can vary, here's a general timeframe for each carrier:

USPS: Typically delivers between 9:00 AM and 5:00 PM, Monday through Saturday.
FedEx: Typically delivers between 8:00 AM and 8:00 PM, Monday through Friday, with some Saturday deliveries.
UPS: Typically delivers between 9:00 AM and 7:00 PM, Monday through Friday, with some Saturday deliveries.

Note:

These are estimated delivery hours and may vary depending on your location and specific delivery circumstances.
For the most accurate delivery information, please refer to the tracking details provided once your order has shipped.

Free Shipping

Free shipping on qualified items to the lower 48 states. Some that are not eligible are stated on their respective product information page. Learn more

Refunds & Returns

Cancellations are accepted within 24 hours of placing an order.
Returns are subject to each manufacturer's return policy. Please look into the return policy of the brand prior to ordering. Learn more

VIVOSUN R4 Inline Fan w/ Variable Speed Controller - 4" Duct