5.4.2 Arrangement of the reference specimensPosition four steel reference specimens in four quadrants (if six specimens are available, place them in six different positions including the four quadrants) in the zone of the cabinet where the test specimens are placed, with the unprotected face upwards and at an angle of 20° ± 5° from the vertical.The support for the reference specimens shall be made of, or coated with, inert materials such as plastics. The lower edge of the reference specimens shall be level with the top of the salt spray collector. The test duration is 24 h.The test cabinet shall be filled with dummy specimens of inert materials such as plastic or glass during the verification procedure