Moisture (water vapor) is present in ambient air as a gas and cannot be filtered. Membrane fibers present in the MMD Series remove water vapor to prevent it from condensing into harmful liquid water droplets inside compressed air systems. The MMD Series membrane dryer utilizes a spiral wrapped bundle of tube shaped membrane fibers to remove water vapor from the compressed air stream. These fibers are engineered to separate moisture without reducing the oxygen content in the compressed air stream. The MMD Series is a great option for applications such as powder painting, laboratory instruments and food packaging machines with pneumatic components which cannot tolerate the presence of any moisture.