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By certification 
(1)Impact resistant, strong and durable.
(2)Completely sealed to prevent dirt, dust and weather infiltration
(3)Allow fresh air into your home when it is raining. Ideal for tropical climate and fresh air fanatics.
(4)The angles of the frame blades may be adjusted to satisfy different ventilation demands.
(5)Clip made from high quality plastic and are available for accommodating 4"/6" Glass. 4-6 inches
(6)Durable powder coated, electrophoresis, heat transferring and anodised coating in different colors