... and rubber seals around jamb, door panels and glass frames, to prevent all rain and winds coming. Poly urethane foam inside door jamb, door panels and ... threshold, it has the function of Sound insulation, Heat insulation and Fire insulation. Heavy ... Treatment:Zinc Coated, Sand Blasted, Primed, Baked, Painted, and Faux Finished, Clear coated.6. Opening:All the doors are ...