Pay attention to specifications

The more information the better
Some manufacturers provide detailed specifications, while others do not. Here are the specification items required to evaluate performance of negative ion generators.

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Specification item Example Importance Negative ion count (blow off direction) 20,000,000(pcs/cc at 0cm) 1,000,000(pcs/cc at 50cm) 700,000(pcs/cc at 100cm) High Negative ion count (angled directions) 500,000(pcs/cc in 30 degrees at 2m) 150,000(pcs/cc in 90 degrees at 2.5m) 10,000(pcs/cc in 180 degrees at 1m) High Maximum coverage area 40 m2 (430 ft2) High Life span 5 years+ High Safety measures Safety circuit, Ozone/EMI suppression High Purification capability 90% of 0.3micron particles removed in 2 hours High Stable performance Designed to maintain performance under extreme conditions Middle to High Life span of ionizing needles 5 years+ Middle Positive ion counts 0(pcs/cc) Middle Ozone production 0.001ppm or less Middle Test operation Comes with the ion detector for test operation Middle Maintenance Cleaning of the ionizing needles Middle Purchase of consumables Not needed Middle Wind noise generation No noise due to no fan Middle Specification item Example Importance