Low-ozone ionizer produces increased negative ion output for ventilation systems

January 8, 2026

The MHM332 Ionissimo™ ionizer module from Murata provides improved air purification performance compared to the earlier MHM305, without increasing the generation of ozone, which is harmful to human health at elevated levels.

The Murata MHM332 ionizer provides a reliable output of negative ions, supporting the air purification function in industrial and consumer ventilation equipment by reducing airborne particles and causing them to cluster and settle. It also uses oxidation to neutralise harmful microbes.

 

 

The output of the MHM332 is rated at 8 million pieces per cubic centimetre, some 1.6 times higher than that of the MHM305, while ozone generation is kept at low levels, not exceeding 0.15mg/h, allowing for lower system pressure while keeping airflow the same.

 

The MHM332 features a split architecture which allows the compact emitter to sit at the intake while the power supply remains on a protected PCB area, permitting straightforward creepage and clearance planning. This reduces compromises around fan placement or enclosure geometry, enabling placement of the Ionissimo directly in air outlets or before the filter for efficiency, even in narrow vents and baffles.

 

The module features a monitor voltage output supporting simple supervisory logic, so firmware can co-ordinate ionization with fan state or scheduled duty cycles, rather than running continuously.

 

The MHM332 operates from a standard 12V dc power supply. It is supplied in three versions with a lead of 100mm, 200mm or 300mm.

 

Features

  • 7W power consumption
  • Operating-temperature range: -10°C to 55°C
  • Relative humidity range: 20% to 80%

Applications

  • Air purifiers and deodorizers
  • Air conditioners
  • Ventilation fans
Murata — MHM332 Series Ionizer Module

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