The PM1300 Dust Collector has dual 4? dust ports (or one 6?). The canister filter offers superior filtering surface area over standard bags, and captures 98% of 2-micron particles. A digital timer can be set for up to 99 minutes, and an infrared sensor allows remote control operation. The all-metal duct improves air flow and rigidity. The clear collector bags are large capacity, which means less down-time changing them. Four swivel casters and conveniently located handles allow for easy mobility.