I don't use a mask but I only have 4 chickens. Do you recommend I use one?
I would recommend it (and yes I know it's tough to get the right masks right now, I happen to have a small box of construction grade N95s) because even if it's not common, bird keeper's lung is a thing: https://www.backyardchickens.com/th...ity-pneumonitis-bird-keepers-lung-flu.1352878
After seeing just how much airborne particles can get stirred up from even basic coop cleaning, I'd rather be safe(r) than sorry.