Health regulations mandate that HEPA filters must be used when vacuuming toxic and noxious dusts such as asbestos, lead, metal salts, chemical dusts, molds, spores etc. to prevent them being expelled into the air where they can be inhaled by operators. Very fine dust collection should also be done with a HEPA filter to prevent any particles from going into the motors where dust buildup can cause premature motor burnout.

BSEN-1822 Std.
Class           Efficiency
Micron Filter Class
H-10 85%
H-11 95%
H-12 99.5%
H-13 99.9%
H-14 99.995%
U-15 99.9995%
U-16 99.99995%
U-17 99.999995%
0.3 HEPA.
0.3 HEPA.
0.3 HEPA.
0.3 HEPA.
0.3 HEPA.
0.12 ULPA
0.12 ULPA
0.12 ULPA

Toxic dust vacuums require HEPA filters to collect 99.9 to 99.995% of all dusts above a 0.3µ particle size. BSEN-1822 standard H13 or H14 are mandatory for anything that is a known carcinogen or has health hazards e.g. lead, cadmium, asbestos.

IndVac Predator vacuums have HEPA filters to H13 fitted as standard.

Pharmaceutical microbes, spores and neurotoxic dusts require ULPA filters to collect even smaller particles.