RadonAway RP145c Radon Fan 4.5in Inlet/Outlet - Ultra-Quiet Energy

In this review the RadonAway RP145c radon fan is evaluated for homeowners and contractors looking for a reliable inline fan for sub-slab depressurization. The bottom line: this fan is best for people who want an ultra-quiet, energy efficient solution that meets electrical code and fits standard radon mitigation systems. It excels at steady air flow and durable operation thanks to a water-hardened impeller and thermally protected motor, making it the go-to choice when quiet performance and long service life are the top priorities.

Key Features

• Energy efficient: The motor is designed to use minimal power while delivering steady suction for continuous radon reduction.
• Ultra-quiet operation: Customers report low noise, so the fan can be mounted near living areas without creating a distraction.
• Commercial and residential rating: Built to standards that make it suitable for both home systems and light commercial installations.
• Water-hardened impeller: The impeller resists moisture and particulates commonly encountered in soil gas systems, extending life.
• Seams sealed: The housing is sealed to inhibit radon leakage and maintain system performance over time.
• Thermally protected motor: Built-in protection reduces the risk of motor damage under stress or temporary blockage.

Who It's For

The RP145c is ideal for homeowners installing or replacing a fan in an active soil depressurization (ASD) system who value quiet operation and low running cost. It is also appropriate for mitigation professionals specifying a dependable, code-compliant fan for most sub-slab systems where a 4.5in inlet/outlet is standard.

Those who should look elsewhere include buyers needing a custom-sized or high-capacity blower for large commercial projects without professional diagnostics, or anyone requiring integrated monitoring or variable speed control from the factory. Fan sizing for retrofit situations may still require a professional diagnostic and design before purchase.

Pros & Cons

Pros

• Very quiet in operation, making it suitable for installation near occupied spaces.
• Energy efficient motor offers lower running costs for continuous use.
• Durable construction with a water-hardened impeller and sealed seams for longer life.
• Meets electrical code requirements and is rated for commercial and residential use.

Cons

• Some users report variable longevity; while many units lasted a decade, isolated failures have occurred within the first year.
• Does not include integrated diagnostics or variable speed control, so professional sizing may be needed for complex installs.

Specifications

Model	RP145c (same as RP145)
Inlet/Outlet Diameter	4.5 in
Application	Sub-slab radon mitigation, ASD systems
Motor Protection	Thermally protected motor
Impeller	Water-hardened motorized impeller
Installation	Meets electrical code requirements; seams sealed to inhibit radon leakage

Our Verdict

The RP145c is a practical, cost-effective choice for most residential radon mitigation jobs and many light commercial needs because it combines quiet operation, energy efficiency, and durable components. For homeowners and mitigation pros seeking a straightforward replacement or system fan that retains proven parts and warranty alignment with the RP145 line, this fan represents solid value when sized correctly.

Frequently Asked Questions

Is the RP145c noisy?
No, most users describe it as ultra-quiet and suitable for installation near occupied spaces.

Will this fan fit my existing system?
It fits systems using a 4.5 in inlet/outlet, but retrofit fan sizing may require professional diagnostics to ensure proper system performance.

How durable is the fan?
The water-hardened impeller and thermally protected motor improve durability; many users report years of service, though isolated early failures have been reported.