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Low EMF vs. Ultra-Low EMF Saunas: What Does It Mean? If you've been researching infrared saunas, you've probably seen descriptions such as low EMF, ultra-low EMF and near-zero EMF. These terms appear frequently in sauna product descriptions, but they can be confusing—especially when you're trying to compare models from different manufacturers. What exactly is EMF? What's the difference between low and ultra-low EMF? And what should you actually look at when comparing infrared saunas? Here' …