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Cable boxes usually have to be sealed at both ends because a fire could break out from both sides as well.
However, this is not always possible: in cavities of ceilings, for example, or when there is a channel at the back side of the box which is no more accessible.
If so, the box can only be sealed at one end, too. Three EasyFoam stoppers are pushed into the box back to back and, thus, it is sealed properly in accordance with the approval.
 
3: Smoke sealing with durable elastic sealants e.g. silicon, acryl, etc. or EasyFoam mounting Foam 4: Mineral fibre board (materiallclassification DIN 4102 A, e.g. Rock wool Multirock partition wallt board, 6 cm thick, 27kg/m³, or equal) placed some 6 cm behind the cap. 5: EasyFoam - Stoppers
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