1. Iibhokisi zokusasaza uqhushumbo kwimizi-mveliso zisetyenziswa kufakelo olunzima lombane kwisebe lesekethe kunye nokutshintsha umoya kwezindlu.. Ezi bhokisi zenziwe ngentsimbi, kunye neepaneli zangaphambili ezikhoyo kwiplastiki kunye nentsimbi. Babonisa encinci, isigqubuthelo esinehenjisi ukuze ufikeleleke lula.
2. Inkcazo yeebhokisi zokusasazwa kwemizi-mveliso-ubungqina bokudubula buxhomekeke kwinani leesekethe ezihlala kuzo. Iibhokisi ezincinci zinokuthatha iisekethe ezine ukuya kwezintlanu, ngelixa ezinkulu zinokuphatha ishumi elinesibini okanye ngaphezulu. Isigqubuthelo esincinci sinokucaca okanye singabonakali.
3. Ngaphambi kokukhetha ishishini ibhokisi yokuhambisa ubungqina bokudubula, kubalulekile ukucwangcisa ukuhanjiswa kwesekethe yombane. Olu cwangciso lubandakanya ukugqiba inani lokutshintsha umoya kunye nokuba ngaba bodwa okanye baphindwe kabini. Ibhokisi yokusabalalisa ekhethiweyo kufuneka ibe nesithuba esaneleyo ngaphakathi, ukuvumela ukongezwa kweesekethe kwixesha elizayo.