Yuav ua li cas cov rooj tog tsim thiab installation yog ntau humanized, thiab nws yog yooj yim dua rau siv. Siv lub tub rau khoom piv txwv, lub tub rau khoom yav dhau los yuav tsis yooj yim rau siv tom qab lub sijhawm ntev, tab sis tam sim no cov tub rau khoom swb rail feem ntau yog ntsia rau hauv tub rau khoom, yog li kev siv lub tub rau khoom yog ntau dua.