4 . flaw because the exhausting black smoke s temparature we use on spare generator is lower , granular pollutant s emmision capacity is large , and is easy to get granular pollutant jamming on channels . it will need to disassemble parts and take back to original factory for regeneration at uncertain time , and it can not improve effectively hc and co in exhaust smoke 4 .缺点:使用于备载发电机排烟温度较低,因此粒状污染物排放量大,容易将粒状污染物堵塞于通道上,须不定时拆卸回原厂再生,且无法有效改善排烟中碳氧化合物( hc )及一氧化碳( co ) 。