An anti-fog mirror is designed to remain easier to see when a bathroom becomes steamy. Instead of wiping the glass after a hot shower, the mirror uses a heating element behind the glass to reduce condensation on its surface.
The feature is also called a defogger or demister. It is commonly built into LED bathroom mirrors but can also be included in mirrors without integrated lighting.
Key Features of an Anti-Fog Mirror
- Heated mirror surface: A thin heating pad gently warms a selected area of the glass.
- Clear viewing area: The warmed section remains clearer for shaving, skincare, makeup, and other bathroom routines.
- Hidden component: The heating pad is attached behind the mirror and cannot normally be seen from the front.
- Simple controls: The function may use its own touch button or operate together with the mirror lights.
- Different coverage sizes: The defogging area may cover the center of the mirror rather than the entire glass surface.
- Built-in electrical system: Wiring inside the mirror supplies power to the heating element.
How Does an Anti-Fog Mirror Work?
Mirror fog forms when warm, moisture-filled air touches cooler glass. The water vapor cools and becomes many tiny droplets that cover the surface and blur the reflection.
A demister pad warms the glass in front of it, making condensation less likely to form in that area. The mirror does not remove moisture from the bathroom; it simply keeps the heated section warmer than the surrounding unheated glass.
The time needed to clear the mirror can vary with room temperature, humidity, heating-pad size, and when the function is switched on.
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