Theuma manufactures timber door systems at Bekkevoort in Flemish Brabant and holds eight Belgian ATG approvals for fire-resisting doorsets: ATG 3183 and 3242 for its double-door range at EI₁ 30 and EI₁ 60, ATG 3034 for single doors at EI₁ 30, ATG 3241 and 3288 for the ZD range, ATG 2274 for the Opdek overlay door at RF 30, ATG 1713 for double doors at RF 60 and ATG 2287 for timber hinged doors at RF half-hour. The most recent was revalidated in January 2026. It sells into the Netherlands from a second office at Nijkerk.