The new Advance PBU series propane-powered burnishers are loaded with performance features to make your floors shine in less time. The PBU series provides the fastest high-gloss burnishing available. The Advance PBU 21 has a 21 inch (53 cm) pad size and can burnish up to 25,000 square feet (2,322 m2) per hour, while the PBU 27 model offers a larger 27 inch (68 cm) pad capable of burnishing up to 33,000 square feet (3,066 m2) per hour. Simple controls ensure your operators won’t be slowed down with machine adjustments — just start it and go. Powerful 603cc Twin-V engines provide the torque to drive the pad at a high rpm that produces a sparkling shine. A catalytic muffler is standard on all models. Select models offer a heavy-duty seal on the shroud that provides the best dust control on the market, a clutch that permits the pad to only turn when the machine is moving, and CARB Gard™, a device that shuts off the engine if it detects harmful emission levels.