This OSHA Table 1-compliant dust box assembly features a filter cleaning mechanism and a HEPA filter. It retrofits onto the d25303d and attaches to the dwh303dh and the dwh304dh as a replacement filter assembly. The durable and clear high-capacity dust box allows the user to see when to empty. The high-efficiency HEPA filter removes 99.97% of airborne particles 0.3 microns or greater. Labels on the outside of the dust box call out the HEPA filter and the OSHA 1926.1153 compliance.