2 Panel Bi Fold Door 1 are simply door which are hanging door which are joined with one side to the wall and other fold attached with walled fold and it hanging with it. . These are Simple and amazing Flexibility designed doors which can open easily. In 2 panels hanging door they doors are may be Glass, Wooden and Aluminums as well. 2 panels hanging door Doors are basically had weather rating, security and safety as well. The basic Manufactures of Bi Fold Doors Are comply with recognized independently manufacturers test for water air and resistance penetration and thermal performance etc.