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 y’ikirere no kurwanya umwanda nicyo gipimo cyibanze cyubwiza bwicyumba. 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).
