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4.1.1.1       Check the exterior for signs, marks or other labels that may indicate that the cargo may put those involved in unpacking the CTU at risk.

4.1.1.2       The labels shown above indicate that opening the doors should follow a particular process. Only the right hand door on a CTU carrying a flexitank should be opened (see figure 5.17). CTUs that have been fumigated (see figure 5.18) or where there is a coolant or conditioner (see figure 5.19) should be opened and ventilated before entering the CTU.

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4.1.2.1       CTUs carrying dangerous goods also should be opened with care as there is a risk that the carrying packages have  have been damaged and the goods spilled.

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4.1.2.3       CTUs transported under fumigation are required to be marked and declared in accordance with the applicable dangerous goods regulations. However, absence of marking cannot be taken to mean fumigants are not present. CTUs marked as having been ventilated after fumigation may also contain fumigant that was absorbed by the cargo and released during transit (see annex 9).

4.1.2.4       CTUs that are fumigated should be properly marked. On occasion, marks may become obliterated or lost during transport. As CTUs may then not be appropriately marked, the doors and vents should be checked. Tape applied to door gaskets or to the vents may indicate the risk of fumigant presence (see figure 5.20).

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4.1.3       If there are concerns that there are signs of a dangerous atmosphere, a safety data sheet (SDS) should be requested from the consignor or from the shipper, as appropriate and sampling the air inside the CTU before opening could be considered.