叉车中的废气过滤器可减少IC发动机排入大气的有害气体和臭味。过滤器的主要目的是去除有毒的一氧化碳和烟灰。
如果叉车配备了柴油发动机，则使用特殊的湿式排气过滤器。废气必须首先通过水浴，以减少气味并过滤烟灰。在下一阶段，剩余的混合物将进入后燃器。在后燃烧器中的特定温度下，不需要的排气颗粒会被氧化进一步减少。

         Exhaust Filter in forklift trucks reduce the damaging and smelly exhausts of IC-Engines into the atmosphere. The main purpose of the filters is to remove the poisonous carbon monoxide and the soot.
If the forklift truck is equipped with a diesel engine, a special Wet Exhaust Filter is used. The exhaust gases have to pass a water bath first which reduces the odour and filters the soot. In the next stage the remaining mixture will pass into an after-burner. At a certain temperature in the after-burner, the unwanted exhaust particles are further reduced by oxidation.