VIVOSUN 4" Inline Exhaust Fan P4 — 130 CFM, Stepless Speed Control & Quiet Energy-Efficient Design

The VIVOSUN P4 4" inline fan is a compact, energy-efficient exhaust fan delivering up to 130 CFM with stepless speed control for quiet, reliable ventilation.

This inline fan is designed for small to medium ventilation tasks where space, noise and energy use matter. Built with an upgraded EC motor, solid ABS housing and PBT blades, the unit balances strong airflow and long service life while keeping sound levels low. It mounts inline with ducting or on walls and ceilings, making it versatile for grow tents, bathrooms, basements, attics and workshops.

How much airflow and noise can I expect from this fan?

The P4 produces a maximum of 130 CFM, enough to refresh modest enclosed spaces quickly. It operates quietly—around 26 dB(A) at typical speeds—so it won’t dominate the soundscape of a room.

• Peak airflow: up to 130 CFM for efficient exhaust
• Noise level: approximately 26 dB(A) at normal operating points
• Suitable for small grow tents, bathrooms, or ventilation boost in utility spaces

How do you control the fan speed and fit it to different setups?

The fan ships with a stepless speed controller that gives you fine-grain adjustment from low to high output. Installation options include inline ducting, wall or ceiling mounting using the integrated mounting points, so it adapts to multiple layouts.

• Stepless speed control knob for precise airflow tuning
• Fits 4-inch ducting for common ventilation systems
• Mountable on walls, ceilings, or inside duct runs for flexible placement

What makes the P4 energy-efficient and durable?

An upgraded EC (electronically commutated) motor reduces power draw while maintaining strong torque, extending runtime and lowering operating costs. The fan’s ABS body and PBT blades resist deformation and stand up to regular use in humid or warm environments.

• EC motor for higher efficiency and longer service life
• ABS housing and PBT blades for impact and heat resistance
• Wide-voltage adapter plus stall protection for safer operation

Is the fan safe to use in home grow spaces and bathrooms?

Yes—this model incorporates low-voltage features and stall protection to reduce electrical risk and protect the motor. Its quiet operation and reliable airflow make it suitable for moisture-prone environments when paired with appropriate ducting and moisture management.

• Low-voltage safety built into the adapter
• Stall protection prevents motor damage under load
• Quiet performance keeps humidity control discreet in living areas

Who is this for: The VIVOSUN P4 4" inline fan is ideal for hobbyist growers, homeowners needing discreet bathroom or basement ventilation, and DIYers who want an efficient, low-noise inline exhaust solution. If you need compact, adjustable airflow with reliable components and easy installation, this fan fits compact duct systems and small-to-medium ventilation demands.