The CDC advises that staff members transform their respirators after 8 hrs of continual utilize. Adjustable Headband N95 mask with adjustable head strap full-face respirators are typically used in environments where particulate matter is present. Free N95 masks free at home N95 mask should You Wear A Cloth Mask Over N95? A N95 mask will not keep you from getting sick on its own. That's the question we set out to answer in our latest article on how effective N95 respirator masks are. Depending on the type of mask you purchase and how frequently you use it.