utineashcleaning the dmf muffler uses a twostage metallic filter to trap ... dmfmuffler patent pending outlet · designed to be maintenance-free the dmf muffler ... not require ash cleaning · take-apart design allows easy removal of the centerbody ... when reinstalling maintenance-free take-apart design allows easy filter ... engineered for performance · patented flow distribution devices1 enhance catalyst ... 300 hp may require two dual dmf mufflers to accommodate engines with higher ... exhaust flow and backpressure the stationary engine ... in south america donaldson dmf mufflers ...