I was interviewing a potential house sitter who has never dealt with chickens before. She house sits for a friend of mine who keeps some doves in an aviary and she said that she always wears a face mask when she cleans the dove cage. I got the impression that she thinks she should also wear one when she is cleaning my coop. I only have five hens in a 6' x 10' coop with an adjoining 10' x 24' pen. We are in southern California, temperate weather year 'round. I wipe down the roost bars, etc. every day to keep dust from accumulating and I've never felt the need for a face mask but since it has never occurred to me before I thought I should ask about it. Should face masks be used when cleaning a coop?