The filter code was given verbally as 60921 and written on screen as 69021. Which is correct, and is it a standardised or manufacturer code? Turns out it's 60921, suitable for organic vapours, available in the UK and luckily an international 3M code and not specific to the US.
The boss, Bob Binnie, didn't believe vapours affect eyes but to be safe, made the operative wear glasses, around which vapour can creep.
All three on screen wore beards and didn't mention how a beard will reduce mask seal.
Apart from that, it was clear to me that the bloke doing the talk had little practical experience (he gained much of it from a conversation at 3am with 3M) and seemed unsure of his information.
Bob Binnie runs 2000 colonies in Georgia and was voted Beekeeper of the Year in 2003; that credibility will probably influence many of us (well, not me) to follow yet more flakey Youtube advice.