Seeing a lot of talk about the effectiveness of 'one-way masking'. Seems like more minimising crap to me.…

Seeing a lot of talk about the effectiveness of 'one-way masking'. Seems like more minimising crap to me. Masks were predominantly designed for one-way use. If you're a tradie working with asbestos, it makes no difference to your protection who else has a mask on in the room.