Ny famehezana ny varavarana vy dia avo dia avo, ny rindrina varavarana sy ny fivoahana varavarana dia hampiasa fitaovana fiarovana amin’ny afo hanatanteraka famenoana fanampiny, ny varavarana afo vy dia tsy vitan’ny hoe mahatratra ny tena vokatry ny fitokanana ny fiparitahan’ny setroka, fa afaka mahatratra ny tena tsara. vokatry ny insulation feo.

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