| 摘要 |
Improvement to subframes for structural openings. The invention relates to a device enabling window units to be made airtight, thereby providing the structural openings with a better thermal insulation coefficient. This device comprises the fitting, onto the subframe 1, of a shutter rabbet 2 in which a groove, receiving a seal 3, is made. The shutters 4 are applied onto this seal. <IMAGE>
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