I te tau 2014, i whakamahia te whakamaroke hau iti o te tomairangi ZCH-15000, ZCH-18000 a Hangzhou Dryair hei whakarato i te hau iti o te tomairangi i te -45℃(73F) mō te 1040 mita pūrua (11200 putu pūrua) Rūma Maroke.

I te tau 2011, i hangaia he rūma maroke huri-kī, 7500 putu tapawha te rahi, tae atu ki ngā whakamaroke whakamaroke iti-tōmaiwai ZCH-8000, ZCH-12000, ZCH-15000, ZCH-16000, ZCH-22000 hei whakarato hau i te Td≤-40℃.