... steelJFW-6006007304203.436001.1Stainless steelAdvantagesEnvironmentally friendlly:Aonuodi roof ventilating fan is efficient ,explosion-proof,uses no electric energy, ... total cost.we have CE certification.ApplicationsAonuodi roof ventilating fan without power is suitable for use in factories, ... and improves the indoor air quality.The roof ventilating fan can work together with air conditioning to create ...