... Carbon Filter for Inline Duct Booster Fan *Carbon layer thickness: 35mm, 50mm*Color available: Black, Grey 1. Working principle Activated carbon filters behave as sponges and ... Greenhouse systems: Inline ventilation fan, Grow tent, Carbon filter, Light reflector, Electronic Ballast, Heavy duty hanger, Flexible duct... Rope Ratchet Filter Hanger Activated Carbon Filter for Inline Duct Booster ...