Access door, which fits outside a Safe fitting.
Some dimensions Ø80–355 have notches for bayonet locking, in order to be better fixed in ducts with positive pressure. You must then add two rivets to the fitting.
Dimensions Ø400–630 have eccentric locks in order to be better fixed in ducts with positive pressure. You must then mount the hooks of the locks in the fitting.
No Click function – no notches.
Can achieve maximum tightness class D.