Ny varavaran’ny afo vy dia manana airtightness tsara, ary ny fanakatonana dia eo amin’ny toerana sy mihidy mafy, ary tsy hamela ny varavarana hantsana sy hahatonga ny rivotra-conditioning sy ny fanafanana mba hifoka. Rehefa misokatra ny varavarana vy afo, dia mila hery 1KG ihany, ny fanokafana misintona hery dia latsaky ny 50N, ary ny varavarana tahony dia napetraka amin’ny haavon’ny 700-1100mm, izay azo mora foana manosika sy misintona ny olon-dehibe sy ny ankizy.

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