This Optrel particle pre - filter is designed to be placed on the TH3 filter before installation into the Swiss Air PAPR. It's a great defense as it efficiently removes large airborne particles and debris before they reach the main filtration system. Comes in a convenient pack of 50.
To use this Optrel particle pre - filter, first take it out of the package. Then place it on the TH3 filter. After that, you can install the combined filter into the Swiss Air PAPR. When handling the filter, be careful not to damage it. If it gets dirty or clogged, replace it with a new one from the pack. Store the remaining filters in a dry and clean place to keep them in good condition.
