A range of respiratory devices made by Philips has been urgently recalled because of a potential safety hazard posed by foam that could break down and be inhaled or emit toxic chemicals. 

The TGA says the recall covers CPAP devices, bi-level positive airway pressure devices and mechanical ventilators.

The polyester-based polyurethane sound abatement foam used in the blower box of their devices may degrade into small particles which could be inhaled or ingested by the user.

Degradation of the foam is more likely if unapproved cleaning methods, such as ozone-based products, are used, the TGA says.