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A window deflector is mounted above the doors of some automobiles, to protect the inside of the car from rain or other precipitation in case of slightly opened windows. Additionally, it may help to prevent precipitation entering the interior in case of an opened door, e.g. dropping from the roof or directly from the air. Deflectors are also fitted to sunroofs to deviate wind.
It is also known as a "monsoonshield" or a "rain visor" (in countries without monsoon).
Based on the way wind deflectors are installed, they may be classified as follows:
- In-Channel. This type of deflectors is installed into the upper window channel, and is kept in place due to tension. In some applications, this type of deflector also employs a thin stripe of automotive-grade 3M tape to keep the deflector in place.
- Stick-on. This installation type requires 3M tape at the back of the deflectors to mount them securely. This adhesive film allows mounting a deflector above the window (either to the window frames, or to the roof if the windows are frameless).
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