| 摘要 |
The invention relates to a further configuration of the invention according to Patent... (Patent Application P 3622830.3). It serves the object of ensuring the circulation of fresh air into household rooms, particularly during the night. The device can be arrested in the roller-blind running rails and on the roller blind. It is constructed from two grid parts, which can be drawn out telescopically and can be fixed with respect to one another, and a closure means for connecting to the roller blind. The idea of the invention is also concerned with roller-blind profile strips which can be integrated subsequently, are provided with air holes and are configured such that, when the roller blind is let down to its full extent, they can be lowered into the adjacent, non-perforated roller-blind strips which are correspondingly configured for this purpose, with the result that the air holes are completely covered.
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