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Four Walls Inc.

Radon professional based in Sheridan, Yamhill County, OR

Contact on the state list	Jan-Michael Barlow, Andrew Manla
Listed as	Radon Measurement Company
Status	On the Oregon Health Authority list; company has an NRPP or NRSB certified technician on staff
Based in	Sheridan, Yamhill County, Oregon

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We publish these details as they appear on the state list. Being on it is not a state license, and we do not vouch for the business. Before hiring, ask to see a current radon certification and a current certificate of insurance.

Checked against Oregon Health Authority radon measurement and mitigation company lists, last checked 2026-11-02. See the issuing agency.

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