What mask should I use to filter radon while installing a fan

No mask filters radon. Radon is a radioactive gas, not a dust or a fume, so a respirator cartridge or a paper mask does nothing to stop it. The durable fix is ventilation and short exposure time while you work, plus a properly installed active mitigation fan that pulls the gas out from under your slab and vents it above the roofline. If you want it done right the first time, that is the part worth handing to a certified crew. Radon mitigation runs $900 to $6,000, and most homes land around $1,950 to $2,250.

Here is why a mask is the wrong tool. Masks and respirators are built to catch particles or chemical vapors. Radon is a single inert gas. It slips right through filter media. A carbon filter can grab some short-lived decay products for a little while, but it loads up fast and stops working, so the EPA does not recommend a mask as radon protection. You can read that on EPA radon (epa.gov/radon). [verify deep URL]

A DIY fan install is a brief job. Your real exposure risk is the long-term average level in the living space, not the few hours you spend wiring a fan. Open the basement up. Run a box fan. Keep windows cracked while you work. Get the job done and get out of the space. That cuts your exposure far more than anything you could strap to your face.

What actually controls radon

Radon comes up through the soil and into the house through the floor wall joint, cracks in the slab, and any open dirt. In a finished basement the answer is active sub-slab depressurization. A fan pulls air from a suction point under the concrete and pushes it up a pipe that vents above the roof. Done right, the gas never reaches the room you live in.

Got a dirt or fieldstone crawl space? Different setup. There we use sub-membrane depressurization, which means a sealed membrane over the dirt with the fan pulling from underneath it. We install both. The EPA action level is 4.0 pCi/L, and EPA says to consider fixing between 2 and 4. You can confirm those numbers on EPA radon and through NH DHHS radon. [verify deep URL]

Why call us instead of fighting a fan install

You can buy a fan online. The hard part is the suction point, sealing the slab, and sizing the system so it actually drops your number. Get the suction wrong and the fan hums along while your level barely moves. We are radon certified (state cert RMS-113966), and Branden runs our radon work. We test, we design the system for your foundation, and we install it.

Radon mitigation runs $900 to $6,000, and most homes land around $1,950 to $2,250. A radon test, if you need one first, runs $50, credited toward the job if you move ahead. Our radon mitigation carries a 10-year warranty. That covers the system. We do not guarantee a specific radon number unless it is written into your agreement, because the level depends on your house and how you live in it. After the system goes in, a post-install retest is your call. You handle that one.

If your test came back under 2 pCi/L, you do not need a system yet. Keep an eye on it and retest down the road. We will tell you that on the inspection. We would rather you trust us than sell you a fan you do not need.

Our soil here pushes a lot of radon. Granite bedrock is common, and that is part of why New Hampshire homes test high. If you are in NH, ME, or MA and your number is over the action level, fixing it is straightforward once the right crew sizes the system.

We are 603 Basement Solutions out of East Kingston, trusted by 5,000+ homeowners in New England, Google rated 4.9 across 250 reviews, and BBB A+ accredited. Licensed and insured, OSHA certified. Want it handled? See our radon mitigation page and the 603 guarantee.

While the crew is down there, a lot of folks ask about water too. If your basement is damp or the floor wall joint leaks, that is a separate fix. Our basement waterproofing and crawl space services pages walk through that. Foundation cracks letting in air and water? See structural and foundation repair.

Ready to fix your radon the right way?

Skip the mask. Call us at 603-610-1770 or book your free inspection. We will test, size the system for your foundation, and give you a quote within 24 hours. Free inspection, free estimate, no pressure!

Related questions

Does a radon fan need to run all the time? Yes. An active mitigation fan runs 24/7. It uses very little power, similar to a light bulb, and it keeps the sub-slab area under constant suction so radon never builds back up.

Can I just open windows instead of installing a fan? Opening windows lowers radon while they are open, but the number climbs right back once you close up. It is fine for a short DIY task, not a real fix. A sub-slab fan is the durable answer.

Do I need to retest after the system goes in? A retest confirms the system dropped your number, and it is the homeowner’s job to run it. We install the system; you handle the follow-up test on your own schedule.

What is the radon action level in NH? The EPA action level is 4.0 pCi/L, and EPA suggests you consider fixing between 2 and 4 pCi/L. NH soil tends to run high because of granite bedrock, so testing matters here.