Professional 6x22 Inches 450CFM Hydroponic Grow Plant Room Coconut Shell Activated Charcoal Carbon Filter Odor Control Scrubber w/ Elastic Ropes & Maintenance Free Design Brand New 6"x 22" Grow Room Coconut Activated Charcoal Carbon Filter Three cotton filter pads encase carbon to avoid carbon leaking out and wasting Light weight, excellent abrasive resistance, more practical, more durable & high-performance sorption Large specific surface area and high adsorption capacity w/ 6 Inches flange Safe, environmental friendly & effective operation; Maintenance free design