Yield Lab 4 Inch Carbon Charcoal Filter Odor Control Scrubber for Grow Tent And HVAC Intake and Exhaust Inline Duct Fan Ventilation System- Pre-filter Included QUALITY DESIGN: Built with carbon charcoal and cotton pad design, this filter is perfect for your stale air needs! Enjoy a maintenance free design that requires no additional tedious work. With an average life expectancy of 1.5 years, you can expect this item to last. ODOR CONTROL: Able to remove most pungent smells and odors, this filter will far exceed your expectations! With a 52mm carbon layer, this filter will block out almost all odors. Unlike most competitors models, the bottom section of the filter is complete and not wasted. This means that 100% of the carbon element is used further purifying your air. So toss out your old gels, sprays and incense and experience premium air filtration today. DUAL FILTRATION: Whether you need intake or exhaust air purification, this filter is for you! Enjoy the flexibility of fresh air coming into your grow area, or removing odors as an exhaust filter. You can even switch the application as needed with just one filter. Come see why many growers have switched to the Yield Lab 4 Inch Charcoal Filter. WIDE VARIETY OF APPLICATIONS: If you do not have a grow tent, do not fret as this system can be applied to many situations. These can include but are not limited to; Greenhouses, kitchens, bathrooms, grow rooms, and many other HVAC set ups. So if you have air filtration issue that needs to be fixed, this kit is for you! INCLUDED COMPONENTS: 1x Yield Lab 4 Inch Purifier Activated Charcoal Filter