AC Infinity Australian Charcoal Carbon Air Duct Filter XL, 6" Fluorescent Light Tubes The spring loaded anti draft damper is The spring loaded anti draft damper is built for heavy duty performance in applications like overhead range hoods in kitchens The Mini trimmer utilizes CenturionPro’s unique diverter allowing the user to fine tune the air flow and cut to ensure preservation of unique strains and densities Each carbon filter features a premium grade Australian Virgin charcoal bed rated at 1200+ IAV These factors not only enable a greater adsorption rate without restricting free airflow but also extend the carbon filter’s lifespan by up to 33%