Ny varavarana afo dia ampiasaina mba hisorohana ny fiparitahan’ny afo haingana rehefa misy afo. Ny varavaran’ny afo vy dia mahatohitra ny fiantraikany, ary ny tanjaky ny rafitra dia afaka manohitra ny fifandonana maharitra nefa tsy mampihena ny fiarovana amin’ny afo, ary mahatohitra ny fiantraikan’ny afo hydrant.

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