Choosing the Right Radon Mitigation Fan
Selecting a radon fan isn't about picking the most powerful option — it's about matching the fan's airflow and pressure characteristics to your specific sub-slab conditions. An undersized fan won't achieve adequate suction; an oversized fan wastes energy. Here's how to think through the decision.
Key Variables That Determine Fan Selection
1. Sub-Slab Soil or Fill Type
The material under your concrete slab determines how easily air (and radon) can move through it. This has the largest influence on fan selection.
- Coarse gravel or crushed stone: High permeability — air flows freely. A lower-pressure fan is usually sufficient.
- Sand or mixed fill: Moderate permeability — mid-range fans work well.
- Dense clay, packed soil, or tight fill: Low permeability — higher-pressure fans required to maintain adequate suction across the slab.
If you're unsure what's under your slab, a mitigator or home inspector can do a diagnostic test using a vacuum gauge after drilling a small test hole.
2. Pipe Run Length and Complexity
Every foot of pipe and every 90° elbow adds resistance (friction loss). Longer runs and more bends require more fan pressure to overcome. As a rough guide, each 90° elbow is equivalent to approximately 5–10 feet of straight pipe.
3. System Configuration
Single suction point systems with short, simple pipe runs can use smaller fans. Multiple suction points, longer exterior runs, or larger slab areas may call for a higher-capacity unit.
RadonAway Fan Comparison
| Model | Best For | Key Feature | Price |
|---|---|---|---|
| RP140 Energy Star | Energy-conscious homeowners, typical residential | Energy Star® certified, ultra-quiet | $280.00 |
| RP145 Pro Series | Most residential installs — the go-to choice | High airflow, Vapor Tite™ sealed, quiet | $329.99 |
| GX4 Pro Series | Moderate to tight soils, enhanced sealing priority | Vapor Tite™ induction welding, durable housing | $428.99 |
| GX5A Pro Series | Tight soils, up to 5" of vacuum | Highest pressure in fixed-speed lineup | $448.99 |
| RP265 Pro Series | High airflow, 6" duct, light commercial | 6" connection, quiet high-volume performance | $449.99 |
| EC6 Variable Speed | Maximum flexibility — tune on-site to any condition | EC motor, adjustable speed, residential + commercial | $578.99 |
Quick Decision Guide
- Don't know your soil type, average home: Start with the RP145 — it handles the widest range of typical Canadian residential conditions.
- Energy efficiency is the priority: RP140 Energy Star
- Know you have dense or clay soil: GX4 or GX5A
- Large slab, long pipe run, or light commercial: RP265
- Professional installer needing one fan for any job: EC6 Variable Speed
Don't Forget These Components
A complete radon mitigation system requires more than just the fan:
- Power cord with bushing — RadonAway fans don't include a cord
- Manometer — visual confirmation the system is working
- PVC cement — for airtight pipe joints
- Sump dome — if your home has an open sump pit
- Muffler foam — reduces fan noise near living spaces
