Size:4 Inch Features: Aluminum structure 50% less weight than competitors. Zinc coating Zinc coating is applied to the metal for rust protection, maximum strength and durability. Aluminum Flange Top and Bottom Aluminum flange top and bottom are exchangeable and can be inverted, which will improve the efficiency and extend the working life. Exceptional Odor Control A1KINGDOM carbon filters not only absorb and eliminate some of the most undesirable smells, keep your space clean and fresh, but also eliminate additional harmful and potentially harmful chemicals from the air you breathe.
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