Agder window manufacturer at Birkeland holding two current SINTEF fire certificates: 1071-CPR-7018 for the Uldal Toppsving at EI 30, a top-hung opening window, and PS 1621 for the Uldal Fastkarm at EI 30 and EI 60, a fixed frame. Both run to July 2029. Certifying the opening and the fixed case separately is the honest way to do it — a fire-rated window that opens has to keep its seal through a hinge and a latch, and a fixed one does not.