VIVOSUN M4 4" EC Motor Inline Fan — 195 CFM Variable-Speed, Quiet Energy-Efficient Ventilation

The VIVOSUN M4 4" EC Motor Inline Fan is a compact, variable-speed mixed-flow ventilator delivering up to 195 CFM of quiet, energy-efficient airflow for grow tents, rooms, and HVAC upgrades.

The M4 pairs an electronically commutated (EC) motor with a mixed-flow impeller to balance strong airflow, low electrical draw, and subdued sound. Built-in PWM speed control, safety cutoffs, and a removable housing make installation, adjustment, and routine cleaning straightforward. This description explains how the fan performs, how to use it, and which setups will benefit most.

How powerful and quiet is this 4" inline fan?

The fan’s EC motor spins up to 2800 RPM and produces a rated 195 CFM, designed to move significant air from a compact duct size. Its motor and impeller geometry reduce turbulence and noise; operating sound is specified at about 28 dB under typical conditions.

• Rated airflow: 195 CFM for rapid air exchange in small to medium enclosures
• Max speed: 2800 RPM for strong extraction or intake
• Noise level: approximately 28 dB for near-silent operation
• Energy efficiency: EC motor reduces power consumption versus standard AC fans

How do I control speed and set it up in my grow tent?

PWM-based control lets you pick from discrete speed levels using a simple knob so you can match airflow to plant stage or room size. The fan includes intake and exhaust flanges with locking tabs plus a 5.9 ft power cord, making duct and power connections fast and secure.

• PWM knob: three selectable speed positions for fine-tuning airflow
• Flanged ends with locking tabs: secure vent hose attachment without tools
• 5.9 ft cord: flexible placement and routing options in tents or rooms
• Detachable components: housing and impeller remove easily for cleaning

What safety and durability features are included?

The M4 uses an ETL-listed EC motor with built-in locked-rotor protection and an automatic reset function to reduce the risk of damage from obstructions or overheating. An electrical junction box made from flame-retardant material adds extra protection where wiring is present.

• Locked-rotor protection: cuts power if blades are blocked and resets automatically
• Automatic reset: restores operation after safe conditions return
• ETL listing: third-party confirmation of electrical safety standards
• Flame-retardant junction box: improves fire safety around wiring connections

In what environments does this fan work best?

Designed for horticulture and small-space ventilation, this inline fan excels in grow tents, grow rooms, basements, and any setting needing dependable airflow control. It can be used as an extractor to remove stale air or as an intake booster to increase fresh air delivery, helping manage temperature and humidity without large-scale HVAC equipment.

• Grow tents and rooms: steady extraction and circulation for controlled environments
• Basements and utility spaces: improved air exchange and odor control
• Supplemental HVAC: targeted airflow where larger systems are impractical
• Portable setups: compact size fits 4" ducting and confined spaces

Who is this for: The VIVOSUN M4 4" EC Motor Inline Fan is aimed at hobby and small-scale growers, DIY ventilation installers, and anyone who needs a quiet, energy-conscious inline fan for compact ductwork. If you want precise speed control, easy mounting and maintenance, and a safety-certified motor in a small footprint, this model is a practical choice.