ʻO ka puka spiral kiʻekiʻe, ma ke ʻano he puka ʻoihana metala hou, hoʻohui i nā hiʻohiʻona o ka hana kiʻekiʻe, ka insulation, ka mālama ʻana i ka ikehu, ka palekana, ka pale ʻana i ka makani a me ka pale ʻana i ke kaiapuni. ʻO ka wikiwiki o ka wehe ʻana a hiki i 1.8m/s, e hoʻohana ana i ka huahana no nā kaila logistic i loko a me waho e koi ana i nā kaʻa holo wikiwiki.