Yescom 4" 176CFM Inline Fan Air Blower & Carbon Filter Scrubber Set Hydroponic Odor Control Air Ventilation Blower: UL listed, CCC, CE, RoHS Certificated for safe use Blower: Powerful and high efficiency Filter: Coconut shell activated carbon filter Filter: Light weight and more practical The combo can eliminate odors, filter particulates and purify air efficiently; The Fan & Filter may be delivered separately or in different time manner for better transit protection.