Carbon Filters & Ozone Generators Carbon Filters remove any unwanted odours coming from your grow room by removing the smell as the air moves over the activated carbon. Use these filters in line with your extraction fan and smell the difference! Ozone has the same effect, but it uses electrically generated and positively charged ozone particles to make the smells stick! Use the generator inline with the extraction fan to maximise the effects and minimise Ozone in the grow room.