... .Carbon layer thick: 35mm,50mm High Efficient Active Carbon Air Filter *Carbon layer thickness: 35mm, 50mm*Color available: Black, ... Activated Carbon Filters are constructed with a 'packed bed' design to give consistent performance, long life (12 to 18 ... all the Greenhouse systems: Inline ventilation fan, Grow tent, Carbon filter, Light reflector, Electronic Ballast, Heavy duty hanger, Flexible duct... ...