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You are here: Fantech USA | Ventilation Solutions

Fantech is a part of Systemair Group
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This product is replaced by 99922 - Rn 4EC-3 Inline Radon Fan ×
This product is discontinued. Please contact us for details. ×

Rn4-3 EC Inline Radon Fan
Item no.: 95903  Weight: 0 gram  Volume: 0 l  Customs statistics no.:

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  • High Flow - High Suction
  • 490 cfm at 0.5" sp
  • 20 cfm at 4.3" sp
  • Equipped with EC Motor
  • Speed Control Included
  • LDVI™ Couplings Included
  • Airtight Housing Guaranteed
  • Large Electrical Box 

How it works

Active radon mitigation systems employ specialized fans to exhaust radon gas from underneath building structures via a sealed pipe system. These systems are designed to remove radon gas before it migrates to a building's interior.


As the most powerful model in Fantech’s family of Radon Mitigation fans, the Rn4 can create 4.3” of suction while moving 20 cfm, as well as move 490 cfm when operating at only 0.5” of suction.

The Rn4 features an electronically commutated (EC) motor.  Inherently efficient and operationally stable at full and reduced speeds, the EC motor arms the radon professional with installation methods not previously practical.  Located in the wiring box, an integral speed control potentiometer can be used to “dial in” the fan speed necessary to achieve either the required sub-slab depressurization or required system air flow rate.  For demand-controlled systems, the potentiometer can be removed from the wiring terminal block to accommodate an externally-provided 0-10Vdc speed command.

The Rn4 series fans are constructed with UL certified, UV protected Polycarbonate material that are vibration welded for 100% leak-proof housing construction. Totally enclosed motors are designed with extra moisture protection for radon application.

The Rn4 also features a housing produced via a vibration welding process.  Without relying on fasteners or sealant, the process results in a fused seam that is strong, permanent and inherently air tight.

What’s included with the fan?

Included with every Rn4 is a pair of Fantech’s new LDVI™ (Low Durometer Vibration Isolators) couplings; 6” X 4” for Rn4-4 and 6” X 3” for Rn4-3.  Designed specifically for radon mitigation applications, our patent pending LDVI couplings are molded with a more flexible, low durometer material as compared to standard plumbing couplings.  The more flexible LDVI couplings make installation easier and provide superior vibration isolation.


Installations that will result in condensate forming in the outlet ducting should have a condensate bypass installed to route the condensate outside of the fan housing. Conditions that are likely to produce condensate include but are not limited to: outdoor installations in cold climates, long lengths of outlet ducting, high moisture content in soil and thin wall or aluminum outlet ducting. Failure to install a proper condensate bypass may void any warranty claims.


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