Characterization of levels of extremely low frequency magnetic fields emitted from portable hand-held fans

Authors: Choi S, Kim S, Bae S, Kim W, Park JH, Chung E, Park J, Park DU

Year: 2019 Aug 2

Category: Bioelectromagnetics

Journal: Bioelectromagnetics

Institution: Bioelectromagnetics Society

DOI: 10.1002/bem.22210

URL: https://www.ncbi.nlm.nih.gov/pubmed/31373404

Abstract

Overview

This study investigates the emission levels of extremely low frequency magnetic fields (ELF-MF) from portable hand-held fans (HHFs), analyzing their principal frequencies and identifying influential factors.

Findings

  • Sample Size: Eleven HHF models were tested.
  • Measurement Tools: ELF-MFs were measured using EMDEX II and an SMP2 EMF-meter with a P400 field probe.
  • A high level of ELF-MF was detected from ten models, particularly near the HHF’s DC motor.
  • Measurement Range: Maximum ELF-MF levels ranged from 14.07 to 218.7 µT, with values above 1.0 µT within 10 cm of the device.
  • Distance and Speed Influence: ELF-MF levels decreased with increased distance but rose with higher fan speeds.
  • Frequency: Recorded ELF frequencies spanned from 1 to 300 Hz.

Conclusion

The study demonstrates a significant emission of ELF magnetic fields by most portable hand-held fans, influenced by both the proximity to the fan and its operational speed. These findings underscore the potential health risks associated with exposure to ELF-MFs, supporting the need for further safety evaluations and regulatory guidelines.

ELF magnetic fields hand-held fans EMDEX II electromagnetic safety frequency spectrum health risk
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