Tim - Gordon has answered your question well below; the Airshield Pro at TH2P offers significantly greater protection than the Evolution at TH1P. The Airshield Pro is APF20, so exposing the user to 1/20th of airborne particles; the Evolution is the lowest level of powered respirator class, TH1P, which at APF10 is exposing the user to 1/10th of airborne particles. So in simple terms, one is twice as effective as the other.
Just to clarify NEITHER product will have an ‘FFP’ rating as they are the wrong category of product; FFP ratings are for disposable respirators (standing for ‘Filtering FacePiece’), whereas ‘TH’ ratings are for powered respirators (‘Turbo Hoods’).
In this context it’s important to note HSE document WIS14 clearly states APF20 is required for machining and sanding of hardwoods. Although HSE might only apply to business users, hardwood dust is toxic and a known human carcinogen, and as I see it the hazard makes no distinction between hobbyists and business users.
