Leej twg paub ntau npaum li cas ntawm cheeb tsam loj ntsev teeb yog siv nyob rau hauv ib chav tsev
Siv tau thaj tsam ntawm ntsev teeb
Ntsev teeb hauv qab 5KG: 7-25W, haum rau chav 3--5 square meters; 5- 7KG ntsev teeb: 15-25W, haum rau chav 5--9 square meters;
7-11KG ntsev teeb: 15-40W, haum rau chav 9--14 square meters;
11-16KG ntsev teeb: 25-40W, haum rau chav 14-18 square meters;
16-22KG ntsev teeb: 40-60W, haum rau chav 18-25 square meters.