Active Air Inline Carbon Filter, 8"x30"Active Air Inline Carbon Filter 8"x30" Advanced Inline Filtration for Flexible Grow Room Design The Active Air Inline Carbon Filter, 8"x30", redefines flexibility in air purification. Designed for growers who need powerful odor control without sacrificing space, this inline filter allows for strategic placement anywhere along your ducting systemnot just inside the grow room. Unlike traditional terminal filters, which are closed at one end, this filter