HEPA filters are H13 classification and can separate up to 99.95% of the particles that are between 0.15µm to 0.30µm. As these particle sizes are the most difficult to capture and most hazardous to physical health they are the main focus. Dustcontrol carries certified HEPA filters, this means each filter is individually tested for its effectiveness. Filters which do not pass inspection are not passed onto our customers. When dealing with your employees or your own health, certified HEPA should be your first and only choice.