Robert ( robertfleming-@hotmail.com )has been heavily involved in Design development, installation, manufacture of large-scale doors for unique situations re: Tunnel ventilation systems, Cyclotron Doors, Bullet Resistant doors and panels High security Doors, Tamper Evident Doors, Ventilation high security panels and other openings, we have manufactured hinged doors 5100high by 2500/2500wide pairs with each leaf weighing up to 1250kilos. These doors were designed to suit tunnel Blast pressures of up to 5kpa which equates to almost 13tonne of pressure against the door set. if you have Unique openings and situations, please contact us and we will Cost, Design and Manufacture all requirement for you.