Airtightness structure (S), it closes airtight the device for especially packing, it is assembled together in the structure in order at the same time to isolate the device for packing from external environment, it includes the multiple airtightness panels which are airtightness appropriately. The environment where one panel differs two at least (A and B), the separable surface in order to separate (1) is demarcated. The air current which is purified (F, F1, F2, F3 and F4) conveyance means in order to convey, being concatenated by the panel (2), with the panel (2), demarcate the hydraulics cutoff wall in order one environment (A) and other environment (B) to avoid the contamination between.
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