75.7. The ladder of a tubular ladder emergency exit shall comply with the following standards:(1) have a minimum width of 450 mm (17.7 in) between the rails;
(2) have a distance of at least 185 mm (7.3 in) from the front of the rung to the wall of the tubular ladder emergency exit located behind the rung, measured perpendicularly from the centre of the rung;
(3) have a space between the top of the rungs of the ladder that complies with the dimensions provided for in section 67.