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FFM-1824 Frequently Asked Questions

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Frequently Asked Questions

Showing 10 of 24 questions

Yes, but please make sure not to overlap multiple heating elements over each other.

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A mirror defogger cold lead is 36 inches long.

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Yes. In fact, this is the most common way to operate a mirror defogger.

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An ultra thin electric heating mat is attached to the back of the mirror, which transmits gentle warmth across a mirror’s surface to prevent moisture from condensing on the mirror's surface during a shower or bath.

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No. Mirror defoggers are designed to be mounted and wired to a fixed, wall-mounted mirror.

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The mirror defogger will begin to defog the mirror within 5 minutes of operation.

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The defogging is concentrated in the area of the heating element, but may spread out as the mirror warms up over time. There are too many variable atmospheric conditions that make it impossible to quote a fixed distance of heat spread away from the element. That is why the defogger must be placed in the area of the mirror that requires defogging.

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No. Mirror defoggers can't be trimmed and the proper size needs to be selected to fit on an open, unobstructed area on the back of the mirror.

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The mirror defoggers are not designed for use with dimmer switches or with any low-voltage control. 

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No. Mirror defoggers are not rated to be installed in wet locations like a shower enclosure.

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If you're gluing a mirror to a wall, simply apply adhesive to the mirror backing, not covered with the mirror defogger.

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The electrical junction box should be installed inline with the Mirror Defogger’s lead wires and box. The box at the back of the defogger is meant to be located over the electrical box in the wall. This way it will be in the electrical box and not interfere with the defogger being flush with the mirror and the wall. The location where the wires leave must be entirely within the area of the new electrical junction box.

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None - it is peel and stick (comes with an adhesive backing).

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It is 1.18“ (1-⅜“ or 30.1mm) square and .21“ (¼“ or 5.4mm) thick.

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As long as the wood is not glued or attached with any form of mastic to the defogger, yes.

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The main electrical line feeding the Mirror Defogger must incorporate a GFCI for North America.

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Yes.

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Nothing can be put on the back of the defogger.

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Yes! WarmlyYours offers custom-sized defoggers in a variety of shapes—including rectangular, oval, and round—to perfectly fit your unique mirror. This tailored solution ensures your mirror looks seamless and performs flawlessly, enhancing both style and function in your bathroom.

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Yes. Mirror defoggers are specifically engineered for damp bathroom environments and are safe when installed according to electrical codes. However, they are not suitable for wet zones such as inside showers, so proper installation location is key to safety and longevity.

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While the installation process is straightforward, connecting a mirror defogger to your bathroom’s electrical system requires expertise. For your safety and peace of mind, we recommend hiring a licensed electrician to ensure the job is done correctly and up to code. This way, you can enjoy your fog-free mirror worry-free, knowing it’s installed safely and reliably.

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As long as your mirror is wall-mounted and stationary, defoggers can be applied to almost any shape. Choosing the right size and shape guarantees the best fog-free results, so you can enjoy a clear reflection no matter your mirror’s design.

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Installing a mirror defogger is a simple process:

  • Clean the back of the mirror thoroughly.
  • Peel off the adhesive backing from the defogger pad.
  • Press the pad firmly onto the center of the mirror's back.
  • Have an electrician wire the lead wires into the bathroom's lighting circuit or a dedicated switch.
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Mirror defoggers are extremely energy-efficient, typically using about the same amount of electricity as a standard light bulb. For example, a medium-sized defogger might consume only 25 to 50 watts. Since they are usually wired to the light switch, they only draw power while the bathroom light is on.

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