Quote:
• If no oil particles are present in the work environment, use a filter of any series (i.e., N-, R-, or P-series).
• If oil particles (e.g., lubricants, cutting fluids, glycerine, etc.) are present, use an R- or P-series filter. Note: N-series filters cannot be used if oil particles are present.
• If oil particles are present and the filter is to be used for more than one work shift, use only a P-series filter
Note: To help you remember the filter series, use the following guide:
N for Not resistant to oil,
R for Resistant to oil
P for oil Proof
Since part of the problem with many tropical woods comes from the oils they contain, I would think that and R or P series filter is needed (and if you want to use the filter more than once than a P series is needed), which from what I've seen means a gas mask type respirator. The number refers to efficiency. P-100 would filter at least 99.97% of particles <0.3 microns. My guess is that P-95 would filter 95% of particles <0.3 microns.