For wildfire smoke, we recommend our VOC/Smoke Filter for the BreatheSmart 45i, FLEX, FIT50 and Classic, or the Fresh Filter for the BreatheSmart 75i.
These medical-grade filters capture 99.9% of particles in your air as small as 0.1 micron, and they include a hefty amount of activated charcoal, which is especially effective at absorbing smoke odor and noxious gas.
Still not sure which Alen + filter combination you need?