Your extraction fan will pull the air inside your grow and through the carbon bed of the filter. The carbon then scrubs that air of all smells and is then blown out through the exhaust completely smell free.
We have 3 brands of carbon filters Rhino, Phoenix and CarboAir. They all range from 100mm right up to 315mm. All will provide your area with adequate smell prevention however the CarboAir has a slightly thicker carbon bed and lasts for a little longer. Depending on your budget and grow area needs we will a carbon filter that will efficiently clear the smells from your grow room.