VIVOSUN R4 4-Inch Inline Duct Fan – 190 CFM with Variable Speed Controller

Overview

The VIVOSUN R4 4-Inch Inline Duct Fan is designed to move air efficiently in compact spaces, making it a versatile choice for grow tents, bathrooms, basements, and small workshops. Its reinforced plastic housing highlights durability, while the combined axial-centrifugal design helps push and pull air through ducting with minimal resistance, promoting steadier ventilation across your setup.

Key capabilities

Operating up to roughly 2300 RPM, this fan delivers up to 190 CFM of airflow. The result is steady air exchange that can help moderate humidity, reduce heat buildup, and support a more balanced indoor climate—without overpowering the room’s soundscape.

• Durable, energy-efficient housing built for long-lasting use
• Airflow up to 190 CFM at 2300 RPM for dependable ventilation
• Low noise operation designed to stay discreet during long runs
• Stepless, on-cord speed control for customized airflow
• Compact, lightweight form with an installation bracket and easy-to-use duct ends
• Versatile for indoor grow rooms, bathrooms, basements, and small workshops

Quiet, adjustable ventilation

The R4 emphasizes quiet performance: durable blades work together to minimize disruption while maintaining reliable airflow. The on-cord speed controller lets you dial in the airflow for different tasks, whether extracting moisture, reducing heat, or circulating air during setup changes.

Simple installation and flexible setup

Designed for tight spaces, the fan is compact and lightweight. It ships with an installation bracket that clearly indicates airflow direction and removable duct ends with locking tabs, making mounting straightforward and adaptable to existing ductwork.

Smart placement ideas

• Grow tents: promote consistent air exchange to balance humidity and temperature
• Bathrooms and kitchens: help remove excess moisture and odors
• Basements and workshops: maintain airflow to reduce moisture buildup and heat pockets

Note: benefits described reflect typical capabilities and setup scenarios. Actual results depend on space, ductwork, and placement.

Specifications at a glance

• Diameter: 4 inches
• Airflow: up to 190 CFM
• Speed range: 0–2300 RPM (variable)
• Noise: typically under 30 dB

Whether you’re building a compact grow tent, upgrading a bathroom vent, or improving a small workshop’s air exchange, the VIVOSUN R4 offers flexible, adjustable ventilation that can adapt to your space and needs.