Nyob rau hauv cov txheej txheem ntawm kev kho cov membrane, tus nqi ntws ntawm cov xa tawm mus rau pem hauv ntej thiab rov qab txheej txheem yog qhov sib txawv heev, thiab cov zaus hloov pauv yuav tsum tau kho tus nqi ntws. Lub twj tso kua mis rotary lobe muaj kev sib raug zoo ntawm tus nqi ntws thiab kev sib hloov ceev, thiab tus nqi ntws tau tswj tau tag nrho. Tsis muaj kuab paug: Rau kev kho daim nyias nyias ntawm cov dej haus, cov dej zoo tau zoo dua qub tom qab kev lim dej hauv daim nyias nyias, yog li nws tsis raug tso cai ua kom cov dej tsis zoo thaum lub sij hawm nqus dej.


