The Aluminium coil yokhala ndi nyengo yabwino yolimbana ndi nyengo imatsimikizira kuti imatha kupirira zovuta zachilengedwe, kuphatikiza kutentha kwambiri, kuwala kwa UV, ndi chinyezi. Izi zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito panja, komwe imasunga mtundu wake wowoneka bwino komanso wonyezimira kwa zaka zikubwerazi.