The reduction of radon by air filtration systems is a relatively new approach that can be accomplished by three different methods, depending upon the type of heating or air conditioning system you presently have.
| Heating or A/C System | Approach |
|---|
| Central Forced Air | Connect air filtration system to return duct in a manner that takes a portion of the air stream, filters it and re-injects it into the return duct. |
| No Central Forced Air But Space in Attic or Crawl Space can Accomodate New Ductwork | Install a stand-alone central HEPA filtration system that circulates air from the interior of the home, filters it and routes it back into the home. |
| No central Forced Air System and No space to Route New Ductwork | Install console unit, HEPA filter systems for each frequently occupied room. |
Although active soil depressurization systems are more commonly used to reduce indoor radon, you may want to consider using one of the three air-filtration methods if you have allergies and indoor radon levels are relatively low. If you do, it is important to note the following:
- HEPA systems that connect to your furnace or air conditioner or that function as whole house filt
- After installation, your home will need to be tested for radon decay products (working level meter) to determine the effectiveness of the system.
- Radon will not be reduced, but the more harmful radon decay products will be reduced.
- The air filtration approach is appropriate for relatively low radon levels between 4 and 8 pCi/L.
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