Masks like SCOTT PRO2 with A1B1E1 filters are designed for organic acids
You might use something cheaper but at about £20 it is worth it if you are considering bent tubes and blowlamp madness
Working back to the last sub zero days I did mine today as well. I use the open 15 mm copper tubes and blowtorch although I did spend on a good face mask and eye protection.
A quick brush of the clearer board, set this aside and a 2 inch eke in place with a glass cover. The pipe through the side of the eke, heat for minute, the gas solidifies quite quickly after it cools on entering the top of the hive and falls onto bees and frames as fine powder, doesn't appear to be a lot escaping.
I do wash the kit after along with my woolly hat and veil and coverall just in case standing to windward has not been enough. Although keeping the blow torch on in today's gale was more of an issue
They don't seem overly disturbed by the process
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