VIVOSUN Smart Air Filtration S4 Kit 4in - Quiet 208 CFM Fan

In this review of the VIVOSUN Smart Air Filtration S4 Kit 4in, the bottom line is clear: this kit is aimed at growers who need reliable, quiet ventilation with precise speed control. The package bundles an AeroZesh S4 4 inline duct fan, a multi-speed E12 controller, a high-performance carbon filter and 8 ft of reinforced ducting, making it a convenient single purchase for a small grow tent or hydroponic setup. The single biggest reason to buy is the combination of strong, adjustable 208 CFM airflow with low noise levels and effective odor control, all in one ready-to-install kit.

Key Features

• Complete kit: Includes an AeroZesh S4 4 inline fan, E12 speed controller, 4 carbon filter, and 8 ft silver ducting so installers get a matched ventilation system without sourcing parts separately.
• Adjustable airflow: The E12 controller provides 10 fan speeds with PWM control so users can precisely stabilize airflow and tailor ventilation to tent size and plant stage.
• Low noise operation: The mixed-flow fan runs quietly at about 39 dBA, which helps maintain a discreet indoor grow environment while still moving air efficiently.
• Strong airflow: Rated to deliver up to 208 CFM, the fan moves significant volume to control temperature and humidity in small to medium grow spaces.
• Effective odor control: The carbon filter uses RC 412 Australian virgin charcoal at 1200+ IAV rating and a 38mm thick charcoal bed to absorb odors reliably.
• Durable ducting and clamps: Aluminum construction with a PET thermoplastic layer plus stainless steel clamps reduces leaks and resists wear for long runs.

Who It's For

This kit is well suited to hobby growers and small commercial users with a 3x3 grow tent or similar spaces who want a compact, integrated ventilation solution. The adjustable E12 speed controller and quiet 39 dBA operation make it a good choice for growers who need both discretion and control over temperature and humidity.

It is less appropriate for very large grow rooms that require multiple high-capacity inline fans or industrial ducting; those users should look for higher CFM systems or modular setups. Also, buyers who need absolute whisper-quiet operation below the fan's rated noise should consider additional silencing accessories or larger ducting runs to reduce perceived sound.

Pros & Cons

Pros

• Complete package with matched fan, controller, filter, and ducting simplifies installation and setup.
• Quiet operation at approximately 39 dBA while still delivering strong 208 CFM airflow.
• Ten-step PWM E12 speed controller with backup memory and timing modes allows customizable schedules and energy savings.
• High-quality carbon filter media offers excellent odor elimination, backed by a 1200+ IAV rating.

Cons

• Designed for small to medium spaces; not intended as a single solution for large commercial grow rooms.
• The kit may require extra sealing or vibration isolation in some installations to eliminate minor air leaks or transmitted noise.

Specifications

Includes	AeroZesh S4 4 inline fan, E12 controller, 4 carbon filter, 8 ft ducting
Fan type	PWM-controlled mixed-flow inline fan
Airflow	Up to 208 CFM
Noise level	Approximately 39 dBA
Carbon media	RC 412 Australian virgin charcoal, 1200+ IAV, 38mm bed
Ducting	Aluminum with PET thermoplastic layer, includes stainless clamps

Our Verdict

The VIVOSUN Smart Air Filtration S4 Kit 4in is a solid, value-oriented ventilation bundle for hobby growers and small hydroponic setups; it pairs powerful 208 CFM airflow with a quiet motor and an effective carbon filter so it handles temperature, humidity and odor control in one package. For anyone building out a single tent or a modest grow space, the included E12 speed controller and quality ducting make this an efficient, easy-to-install solution that balances performance and price.

Frequently Asked Questions

Can the E12 controller remember my last fan speed?
Yes, the controller includes backup memory to retain the same setting after power cycles.

Is the kit suitable for a 3x3 grow tent?
Yes, customers report this kit works well for 3x3 applications, providing good airflow and odor control for that size.

Does the filter remove strong smells?
The carbon filter uses high-grade RC 412 charcoal at 1200+ IAV and a 38mm bed, which provides excellent odor elimination for common grow smells.