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Open all ventilation grilles in the house 24 hours a day. Because fresh air can flow in, the air in the house is a lot healthier.
![[Translate to English:]](https://storage-customers.zig365.nl/duwo-ksp-web-hupo-portal-p-pub/_processed_/9/8/csm_Kolffpad-hoek-ongemeubileerd-groot_4_6f09cb8064.jpg "[Translate to English:]")