Using the DeWalt DWH302DH is easy. First, retrofit it onto the D25303D if needed, or use it as a replacement filter assembly for the DWH303DH and DWH304DH. When in use, the filter will start capturing airborne particles. Keep an eye on the clear dust box, and when it looks full, empty it right away. For maintenance, let the filter cleaning mechanism do its job. It back - flushes air over the HEPA filter. But make sure to follow OSHA regulations. Also, check the labels on the dust box regularly to ensure it's still compliant with OSHA 1926.1153. If you notice any issues with the filter or the assembly, get it checked or replaced promptly.