Air Box 1, Stealth Edition (4")Eliminate bad odors and other pollutants from the air in your grow space with Air Box 1, Stealth Edition. It consists of high flow filters that use 100% of the surface area available to ensure optimal operation. It is excellent for commercial and residential applications. The carbon filtration system is made with superior quality virgin coconut charcoal. Each unit is replaceable, airtight, and very easy to install into any filter or ducting system.