Ki te whakatauritea ki te ngongo whaiwhai maru noa, ka mau tonu te parenga waiariki whakapiri i roto i te awhe nui me te huringa o te pāmahana, no reira he pai ake te mahi whakawhiti wera o te konumohe bimetallic extruded finned ngongo he pai ake i te ngongo torino i roto i te awhe pāmahana taiepa ngongo rohe.
I tua atu, ka whakatauritea ki te ngongo porowhita, ko te bimetallic konumohe extruded fin ngongo he tino pai te aukati me te kaha nui, ka taea e ia te tu atu ki te 4.0MPa te horoi i te pehanga wai, kaore ano kia taka ki raro, te turanga o te ngongo konumohe bimetallic extruded.Ka taea te whiriwhiri i te ngongo kia rite ki te pirau o te wai i roto i te ngongo me te hangarau tukatuka.Ka taea e te ngongo turanga te waro maitai, parahi, kowiri tira, etc.