UltraLight Carbon + Zeolite Air Filters, NodorScrubbers by GrowRiteUSA (6" & 8" Duct/Fans) CFM Exhaust/Recirculation: 700/1400, Room Size for Exhaust: 1920 Cubic Feet Compact Size: 8.5"D x 12", Ultralight Weight: 3lbs Virtually no CFM loss, great for both 6" & 8" duct/fans (.2"wg @ 6" Fan Max) 6 Month Money Back Guarantee! If you aren't satisfied with the NodorScrubber, we'll give you a full refund This ultralight 3lb NodorScrubber outperforms scrubbers 10X times its size & weight! The 6" NodorScrubber's air scrubbing capacity is equal to that of 61 pound traditional granular or pellet can scrubber (see details in product description)