Insects

Do sand flies get through insect screens?

Yes, sand flies and similar very small insects can pass through the holes of a standard insect mesh. A finer-structured nanofiber window filter keeps these tiny insects out too.

Published: 17 October 2026 · 2 min read

Do sand flies get through insect screens?

Short answer

The sand fly is a flying insect much smaller than a mosquito. It appears especially in warm, humid areas in the evening. Because it can get through an ordinary insect screen, it is a common reason for the complaint “I have an insect screen but I still get bitten”.

Why do they get through?

The holes of a standard insect mesh are designed around the size of a mosquito. Sand flies are smaller than these holes.

What can you do?

On windows and doors, fit a window filter; its membrane has no pores an insect could get through.
Make sure there are no gaps at the edges; hook-and-loop fitting has the advantage here.
Dim the lights indoors in the evening.

Details: mosquitoes and micro insects.

Mosquitoes and tiny insects

If you get bitten at night even with an insect screen fitted, the culprit may be tiny insects such as sand flies that pass through an ordinary mesh.…

Open your window, keep dust and pollen outside

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Last updated: 17 October 2026