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Can the window stay open when it rains?

With an ordinary insect screen, raindrops come in when the window is left open in the rain. A window filter, however, keeps direct rain out, so you can leave the window ajar and air the home on rainy days too. In a heavy storm you still need to close the window.

Can the window stay open when it rains?

Short answer

The air after rain is usually clean; pollen and dust are washed down by the rain. This is a good time to air the home. The problem is raindrops coming in while it rains.

The window filter and rain

The tight structure of the nanofiber membrane holds back direct raindrops. With the window ajar, no water gets in during light rain and air keeps flowing.

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Open your window, keep dust and pollen outside

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Last updated: 17 October 2026

Related topics: Window filters

Our guides on what a window filter is, how it works, nanofiber window filters, indoor air quality and airing your home the right way.