GVS Elipse SPR450 P100 Nuisance Odor Filters — Pair, HESPA Media + Activated Carbon (Odor Relief Only) ergodyne Power tools workshop (~95 fire safety Power tools workshop (~95 dBA) ~85 dBA after derating Good fit Heavy equipment construction (~100 dBA) ~90 dBA after derating Good fit Manufacturing plant floor (~90 dBA) ~80 dBA after derating Good fit Firearms impact (140 dB peak) Impulse noise Add earmuffs (dual) Who Should Buy the Sellstrom S23422 or sound amplification it attenuates noise the moment you put it on The second half is a layer of activated carbon that provides nuisance level odour relief: it reduces unpleasant smells at concentrations already below the exposure limit The distinction that matters: the P100 is real