... 1250mm 2.Carbon layer thick: 35mm,50mm Active Charcoal Air Purifier, Air Filter *Carbon layer thickness: 35mm, 50mm *Color ... formation of preferential channels which can allow untreated air through the system. And Housing Material is Galvanised ... Carbon filter, Light reflector, Electronic Ballast, Heavy duty hanger, Flexible duct...Rope Ratchet Filter Hanger Active Charcoal Air Purifier, Air Filter