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| Series | Features |
|---|---|
| AN□00 | ・Metal body type ・Noise reduction: 30 dB (A) |
| 25□□ | ・Metal case type ・Noise reduction: 19 dB (A) |
| AN | ・BC sintered body type ・Noise reduction: 13, 16, 18, 21 dB (A) |
| AN□02AN□1 | ・High noise reduction type ・Noise reduction: 35, 38, 40 dB (A) |