Swiss Air ventilated half-mask replacement pre-filter that have been designed to remove larger particulates first to extend the life of these filters. Removing 99.8% of welding fume, dust, smoke and aerosol. 
 
For use with Optrel Swiss Air ventilated half mask that completely covers the mouth and nose area supplying them with purified air to create a breathing space. Swiss air has positive pressure that supports the user in breathing and eliminates tiring breathing resistance.
 
We also offer a subscription to these filters, saving 5% when subscribing to receive a brand new filter every month.