A. All Osburn fireplaces are certified as per the latest CSA standards. Most of our fireplaces are tested by Warnock Hersey, an independent testing agency which role is to certify that our units comply with the security standards set by the CSA (Canadian Standard Association). This is why the certification plate at the back of our fireplaces reads “Warnock Hersey”. ULC (Underwriters Laboratories of Canada) is another independent testing agency.