Reddit mentions of 3M 6000 Series Half Mask Reusable Respirator/Dust & Gas Mask - 6200/Medium

for all housework (sanding, painting, wallpaper removal, plaster mixing, etc...), I roll with a 3M 6000 mask and P3 filters ... runs around 20 GBP for the set up and the filters are good for a month.

I like the 3M mask because I can swap on chemical filters and keep the dust filtering effect.

half-mask (£12): https://www.amazon.co.uk/gp/product/B005HK05L2/

A2 organic filters: £10
https://www.amazon.co.uk/gp/product/B000U749VE

pack of 5 sets of P3F dust filters (£10/set):
https://www.amazon.co.uk/gp/product/B008OHMNQK

cheap protection and good for the lungs

this respirator and these filters are what i buy for my fiance. i use this one but its excessive for the first time casting :)

basically you want to look for A2 clasification or better on your filters, these will work for woodworking as well but you may want to get seperate filters for woodworking and just swap them out when needed as the A2 filters are more expensive. a mask with replacable filters will be more costly at first but much more comfortable and cheaper to replace filters than the whole thing.

everyone likes the 3m stuff because its generally very good (i only dont use one since i like my powered unit with no belt power pack) and it is everywhere so replacements are easy to get. i find they tend to last less time than my cleanspace filters but they do have less filter area so that natural ( glassing every day 2-3 hours ill go through a 3m set in around 20 days to a month, cleanspace one has lasted about 7 months of resin work with no detrimental effects so far)

hope that helps!