If a frame bears a recognized label qualifying it as a fire door frame, it may support a 3-hour, a 1-1/2-hour, a 3/4-hour, or a 1/3-hour door.
This is a publication of the Steel Door Institute called “Basic Fire Door Requirements,” and it includes a paragraph that sums it up clearly: “Fire doors frames are not affected by the exposure ratings and opening classifications that apply to doors.
There are no hourly ratings for a basic fire door frame unless the labeling on the frame specifically states that the frame is rated for something less than 3 hours.
As such, it has been felt that the painting of an embossed label will not affect the rating of the frame or the legitimacy of the UL label…Labels that do not feature raised embossment of the label information should not be painted, as the paint will obscure the information.” So there you go.
According to UL, you can paint over an embossed label as long as the information on the label is still legible.
Also, as part of that process, we will add your particular product information such as company name, electrical ratings, warning notices, date codes, etc. A proof is always provided to you for final approval.
When shopping, look for the Underwriters Laboratories (UL) mark on labels.If a CSA certified process is requested, Nelson will add its CSA designated identification mark to the label near the CSA logo.The CSA mark indicates that a sample of the product has been certified to applicable standards including standards written or administered by the American National Standards Institute (ANSI), Underwriters Laboratories (UL), CSA Group (CSA), NSF International, and other North American organizations.Underwriters Laboratories has made changes in the application and use of their Listing and Classified markings.We can walk you through the process of getting the UL nameplates markings your products require.Companies utilizing UL's "Type R" follow-up service will have their label or overlay layout reviewed and approved by UL.