Ny tombony maro amin’ny varavarana afo vy dia mahatonga azy ireo hibodo ny tsena lehibe kokoa amin’ny tranom-panjakana. Ny varavarankelin’ny afo vy dia tokony ho feno fitaovana tsy mirehitra, ary ny mari-pana mitsonika ny kojakoja fitaovana toy ny hidin-trano, ny savily ary ny latch dia tsy tokony ho ambany noho ny 950 ° C.

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