MHB manufactures slender steel profile systems for windows, doors and internal screens from its Herveld plant. It holds SKG-IKOB Certificate of Constancy of Performance 0960-CPR-SKGIKOB.012574.01.ENG for fire- and/or smoke-resisting doorsets, windows and curtain walling under NEN-EN 16034, issued by notified body 0960, alongside 0960-CPR-SKGIKOB.012575.01.ENG under NEN-EN 14351-1 for escape doors. Both are current in the SKG-IKOB public register.