厨房的排烟系统主要由集烟罩、排烟管道、油烟净化器、排烟风机（含消音器）和厨房整体补风装置构成，见下图。
The smoke exhaust system of the kitchen is mainly composed of smoke collecting hood, smoke exhaust pipe, oil fume purifier, smoke exhaust fan (including muffler) and integral air supplement device of the kitchen, as shown in the figure below.
油烟净化器的类型和运行方式可以根据实际情况进行选择。在油烟净化器安装之前，首先要对排烟系统中各部分的实际运行参数，包括运行阻力和排风量进行核算。如果是新建项目，在设计时要充分考虑安装了油烟净化器后对排风系统的影响；如果是改造项目，在加装油烟净化器时需要对排风系统重新进行核算，必要时要对集烟罩、排烟管道和厨房整体补风装置进行改造并更换排烟风机。
The type and operation mode of oil fume purifier can be selected according to the actual situation. Before the installation of the fume purifier, the actual operation parameters of each part of the exhaust system, including the operation resistance and exhaust air volume, should be calculated. If it is a new project, the influence of installation of fume purifier on the exhaust system should be fully considered in the design; If it is a renovation project, the exhaust system needs to be checked again when installing the oil fume purifier. If necessary, the smoke collecting hood, smoke exhaust pipe and the overall air supplement device of the kitchen should be reformed and the smoke exhaust fan should be replaced.