What is the required inlet and outlet diameter for the RadonAway RP145C?

You must confirm your existing ductwork matches this 4-inch standard before ordering to ensure a proper seal. Measure the internal diameter of your pipe to verify the fit.

For a comprehensive breakdown of the specs, see our full RadonAway RP145C review.

RadonAway RP145C airflow capacity and 4-inch internal port diameter

The RadonAway RP145C features a 166 CFM airflow capacity and a 30-decibel noise level. Because radon reduction systems rely on consistent air movement through specific pathways, ensuring the pipe diameter matches the fan’s port is critical to prevent air leakage or resistance. We selected this model for our comparison because of its high-pressure capability and 1381 buyer ratings averaging 4.4. Does the port size include the housing? The 4-inch measurement refers to the internal port where the pipe connects. The unit uses an EC motor to move air while remaining energy efficient at 15 watts. The data does not state the maximum allowable static pressure for this specific blower model.

You can find more details in our RadonAway RP145C comparison analysis.

What to Check Before Buying the RadonAway RP145C

Verify these technical requirements to ensure the fan functions correctly in your specific environment before you purchase the unit.

Make an informed final decision by viewing the RadonAway RP145C final verdict.

• Confirm your ductwork is the standard 4-inch size to avoid needing custom adapters.
• Measure the space available for the 6-pound unit to ensure the housing clears your mounting area.
• Check that your power source provides a standard 120-volt connection for the corded electric design.
• Verify that your application involves ambient air, as the specs do not confirm high-temperature exhaust limits.
• Identify if you need transition fittings to bridge the gap between your specific pipe material and the fan port.

Comparing the RadonAway RP145C to Other Options

This radon fan, which is a high-pressure blower designed to pull gas from beneath a home, serves a specific niche in the market. Buyers seeking lower-volume airflow or different mounting styles might find other options more suitable for their specific layout. If you require a fan that handles much higher volume than 166 CFM, you may need to look at industrial-scale alternatives. This model is designed for residential use where high-pressure performance is the priority over high-volume movement.

If you are still deciding, see our guide to the best radon fan for home use.

If you have standard 4-inch residential ducting and need a reliable, high-pressure solution for radon mitigation, the RadonAway RP145C is the appropriate choice.

Consider these alternatives by looking at the best crawlspace basement ventilator fan options.

Reviewed by the Refrigerant Recovery Pro editorial team. Refrigerant Recovery Pro writes these guides from the 200 most-reviewed axial blower listings in our retail dataset, not from manufacturer copy.