The NT 80/1 B1 M safety vacuum cleaner avoid the risk of possible dust explosions. Combustible dusts and category Hazardous dust have to be vacuumed away immediately since it is risky if they deposit. For vacuuming such dusts a B1 proofed safety vacuum cleaner like the NT 80/1 B1 M is needed (European approval of 94/9 EC (ATTEX))