VIVOSUN G4 4 in Inline Duct Fan & Temp Humidity Controller - Quiet 195

In this review the VIVOSUN G4 4 in Inline Duct Fan paired with the E42A temperature and humidity controller is presented as a practical solution for small grow tents and greenhouse accessories. The bottom line: it is best for growers who want a compact, app-controlled exhaust fan that balances strong airflow with low noise and offers environmental monitoring. The biggest reason to consider it is the unified GrowHub app platform and built-in sensor, which let users automate fan speed, monitor VPD and program growth-stage changes without separate devices.

Key Features

• App Control: The WiFi-enabled GrowHub E42A lets you operate the fan remotely and load grow recipes for automated schedules.
• Environmental Monitoring: A built-in temperature and humidity gauge with one probe provides internal and external monitoring and VPD tracking through the app.
• Energy Efficiency: PWM motor control reduces power draw while maintaining useful airflow for small to medium enclosures.
• Low Noise Operation: The mixed-flow design and EC motor keep ventilation quiet at about 28 dB, suitable for home setups.
• Long Distance Air Delivery: The mixed-flow impeller design helps move air across longer duct runs than typical axial fans of similar size.

Who It's For

The G4 4 in inline fan with E42A controller suits hobbyist and serious home growers using compact tents or small greenhouse zones who want integrated control and environmental feedback. Its combination of a 4 in duct fan and a smart controller is useful when you want to automate fan speed, log temperature and humidity, and run grow recipes from a phone.

It is less suitable for large commercial rooms or situations that require very high CFM, multiple remote probes, or dedicated industrial controllers. Buyers needing redundant probes or multi-fan synchronization across large footprints should look to larger systems.

Pros & Cons

Pros

• Quiet operation with a reported noise level around 28 dB, making it unobtrusive in home environments.
• Good air movement for a 4 in mixed-flow fan; customers report power and airflow comparable to other quality duct fans.
• Solid build quality and perceived value; users find it well made and a sensible price for combined fan and controller features.
• App controllability and unified GrowHub platform simplify programming and automation across smart devices.

Cons

• Only a single probe is included, so multi-point temperature or humidity monitoring will require additional sensors or workarounds.

Specifications

Brand	VIVOSUN
Fan size	4 in inline mixed-flow fan
Max airflow	195 CFM (mixed-flow performance)
Noise level	Approximately 28 dB
Controller	GrowHub E42A WiFi temperature & humidity controller
Monitoring	Built-in temp and humidity gauge with one probe
Motor control	PWM / EC motor for energy efficiency

Our Verdict

The VIVOSUN G4 4 in inline duct fan with E42A controller is a well-rounded pick for small tent and greenhouse setups that need quiet, controllable ventilation and environmental monitoring. It offers good airflow for its size, solid build quality and the convenience of the GrowHub app, making it a strong value for hobby growers who want automation without complex installs.

Frequently Asked Questions

Can the fan be controlled remotely?
Yes. The GrowHub E42A is WiFi-enabled so the fan and controller settings can be adjusted via the app from anywhere.

Does the controller monitor humidity as well as temperature?
Yes. The E42A includes a built-in temperature and humidity gauge and a probe for monitoring internal and external conditions and VPD.

Is this fan loud in a home setting?
No. The mixed-flow design and EC motor keep noise low, around 28 dB, which customers report as quiet for indoor use.