Use these tips to prevent chin stubble and ’staches from putting your workers’ health at risk. 3M TechUpdate Facial Hair & Respirators The effects of facial hair or beards is a common issue wherever respirators are worn. Does it matter? The answer is clear - Beards are not acceptable if close fitting respirators are worn. However, you provide half-face respirators to anyone on a voluntary basis; however, When you asked the employee about his facial hair.