Jonkers Bouwmetaal manufactures steel frames, screens and doorsets at Urk. Jonkers MVA B.V. holds SKG-IKOB certificate 0960-CPR-SKGIKOB.015793.01.ENG for fire- and/or smoke-resisting doorsets, windows and screens under NEN-EN 16034, issued by notified body 0960 in November 2025, with sister company Jonkers Stalen Kozijnen B.V. named as the certified production location, plus 0960-CPR-SKGIKOB.015792.01.ENG under NEN-EN 14351-1.