At this stage, there is no fade-out time for old EN149:1991 norms. Manufacturers can continue to produce EN149:1991 respirators if they maintain the valid certificate. However, commercial pressure from the customers will motivate the manufacturers and distributors to provide the up-to-date EN149:2001 products. San Huei will discontinue old EN149:1991 products by June 2002 and will supply only EN149:2001 products afterwards.