The AST L door is constructed with a panel and gaskets with a simple seal,with a frame in extruded aluminum profiles and Ponzi accident-prevention coplanar panels, with a 40 or 50 mm honeycomb panel, coated on both sides with HPL plastic laminates, and fireproof material inside, with Class 1 reaction to fire. The frame is equipped with panels from 10 to 50 mm.