Isuku yo mu kirere ni ubwoko bwurwego mpuzamahanga rushyirwa mu byumba bisukuye. Mubisanzwe kora ibyumba bisukuye kandi byemerwe bishingiye kubusa, bihagaze kandi bigenda neza. Guhorana isuku yikirere no kugenzura umwanda nicyo kintu cyibanze cyubwiza bwicyumba gisukuye. Ibipimo ngenderwaho bishobora kugabanywa muri ISO 5 (Icyiciro A / Icyiciro 100), ISO 6 (Icyiciro B / Icyiciro 1000), ISO 7 (Icyiciro C / Icyiciro 10000) na ISO 8 (Icyiciro D / Icyiciro 100000).
