Amin’ny maha-vokatra teknolojia avo lenta azy, ny varavarana afo dia tsy vitan’ny hoe manatsara ny tranontsika, fa manampy teboka amin’ny fiarovana ny tranontsika. Ny varavarankelin’ny afo dia azo amboarina amin’ny varavarankely, louvers, ventilation louvers, sns.

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