1. Upper andlowerisolation auala e maua 2.Three-vaega vaeluaga fausaga ma stronginsulation 3.Product modularization,faasologa mamanu, canimprove le gaosiga lelei o le wholemachine 4. Faʻataʻitaʻiga faʻapitoa, talafeagai mo avanoa laiti, faʻatapulaʻaina nofoaga. 5. Fa'asoa fa'atasi o le eletise eletise ma le maualalo o le tu'uina atu o vaega 6. E itiiti le afaina i le vevela ma le maualuga.
