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. 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. Select models offer catalytic mufflers, a heavy-duty felt seal on the shroud that provides the best dust control on the market and CARB GardTM, a device that shuts off the engine if it detects harmful emission levels. Easy pad changing, low maintenance and rugged dependability round out the benefits of choosing the new Advance PBU series of propane- powered burnishers.