... steel makes the ventilator more strong, resistant to wear and non-viscid. Model: 500 stainless steelMaterials: Adopting high- ... fine non-viscidity, self-cleanness, high revolving sensitivity and high air venting efficiency.Working Condition: It begins to revolve ... requires improvement in worksheds, factories, barns, stables, sheds, portable buildings, pool cabanas. Clients want ventilators to work as ...