What radon fan is right for my home?
Radon fan sizing can be difficult for licensed mitigators, not to mention do-it-yourselfers. When sizing a radon fan, there’s only one thing that matters: PRESSURE FIELD EXTENSION. Pressure field extension simply means: how far am I drawing radioactive air from beneath my home? It’s typically determined by taking specific measurements using a suction point and micro-manometer. For the DIYer, these tools are cost-prohibitive. If you want your radon mitigation system done right, always call a licensed, certified radon mitigator.
In order to estimate your fan size for yourself, you’ll need three things:
- Size of the building footprint (in square footage)
- Current radon level (long-term test, if possible)
- Building type
- slab on grade
- tri-level or garden level
- crawlspace, etc.
It is for this reason, that it’s impossible to size a radon fan before the building is completed and a radon level has been established.
With this information, PDS can help you size a fan by phone.
PDS’ phone estimations are just that: estimations. Unfortunately, PDS does not take returns on DIY fan installs. Take accurate measurements and be confident in your selection. PDS is here to help. The only folks with a guarantee are radon mitigation professionals performing contracted work.
Tips on fan sizing:
- Use a floor bushing and dig a large suction pit (at least 15-20 gallons [3-4 “home depot” buckets] of dirt and debris). Dirt augers are helpful tools for this job.
- Always use a manometer. PDS cannot help diagnose fan issues if we cannot calculate airflow and static pressure.
- Be prepared to change fans or add a second system on the opposite end of the home.
- Even mitigators with decades of experience sometimes come up short. It’s not always as simple as adding a “bigger” fan.
- Know what’s under your home:
- request foundation plans from the original owner/home builder
- 4″ gravel base or just dirt?
- clay? sand? something else?
- Were radon-ready new construction techniques used? If so, what products were installed? (Home builder should have a record)
- How to Video: Understanding Fan Curves for performance calculations
- PFEDK fan sizing tool: what the professionals use