Have you ever wondered why there are tiny holes in airplane windows? This detail, which may seem insignificant, actually plays an important role in how the cabin functions.
In a video for the YouTube channel Mentour Pilot, pilot Petter Hörnfeldt explained the purpose of the holes, known as “breather holes.” According to Hörnfeldt, airplane windows are made up of three layers, and the holes are located between them.
According to the pilot, the outer layer is “designed to handle impact and pressure differences,” while the sole purpose of the middle layer is to protect the outer layers. There is also a gap between these layers, and this is where the holes come into play.
Because of the gap, there is air between the outer and middle layers. “Pressure and temperature differences would start causing forces to build up between the layers, trying to bend them inward or outward,” the pilot explained.
“This little hole is placed there to allow air to flow slowly and relieve that potential pressure difference,” and that is where the name “breather hole” comes from, according to Hörnfeldt.
However, allowing air to flow is not the only reason for the hole. In fact, it also helps passengers see outside and take those scenic cloud photos. “It makes it harder for moisture to get trapped between the layers and start fogging up your window.”
Unfortunately, the hole does nothing to stop dirt from getting stuck on the outside of the window, which is what usually ruins those photos.
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Photo and video: Unsplash / YouTube @MentourPilot. This content was created with the help of AI and reviewed by the editorial team.
