Technical specification • Dimensions : 60x30 cm • Material: polystyrene (HIPS) resistant to heat, cold, ultraviolet radiation, acidic and alkaline material, pressure, tensile and impact • Graded deflector: to tune inlet air in best angle • Spout damper: Prevent the passage of air along the valve and login uniform air inside the hall • Double skin damper: Compressed Foam Insulation and Preventive of heat loss • Central column: two columns to increase Strength of the valve body • Damper spring: four springs to keep the valve closed while using tunnel ventilation • Protective net: preventive to entry of other animals to the hall • Electrical winch and transmission motor: applicable and can be controlled by automation • Hand winch: can be connected to barometer to control hall air pressure • Stepped edge of damper: preventive of air infiltration when valve is closed
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