Ny varavaran’ny afo vy no karazana varavarana afo mahazatra indrindra, raha oharina amin’ny fitaovana hafa amin’ny varavarana afo, ny varavarana vy dia manana tombony manokana. Ny hatevin’ny vavahadin’ny afo vy dia mizara ho fenitra telo A, B ary C, miaraka amin’ny insulation feo tsara, fampisehoana insulation hafanana.

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