The Spider Farmer 4-inch Air Carbon Filter was designed to manage odors and to maintain efficient airflow in indoor grow environments. The high-quality Australian activated charcoal ensures filtration of the unwanted smells in the room as well as the particles in the air. The absorption is enhanced by the granular charcoal that also ensures longer lifespan of the filter. The structure is made of heavy-duty aluminium flanges and a sturdy galvanized steel housing. The washable pre-filter that captures the larger particles of dust is very useful both in maintaining the air clean, and in expanding the filter’s lifespan. The Spider Farmer 4-inch filter is highly versatile. It works efficiently in kitchens, bathrooms and closets, but it’s particularly in indoor growing environments. The Spider Farmer 4-inch Air Carbon Filter offers a maximum capacity of up to 205 CFM. Need more power? Consider the Spider Farmer 6-Inch Air Carbon Filter, which offers a capacity of up to 402 CFM.