The Particle Filter is an advanced version of the suit’s Particulate filtration system, using the primitive technology previously used to facilitate survival in the toxic caverns we are now able to stripe specific partials from the particulate dense air found in the various caverns. The Particle Filter is built in a 5x3x5 formation.
Advanced filters fitter to the hazard suit allows it to remove toxic substances from the air. You only need one of these and it must be kept in your inventory to function.