1.Use for hydroponic greenhouse. 2.Eliminate odor and other fine dust. 3.Size:12". 4.prevent carbon moving. 5.filter air. Our carbon filter is designed to take in the dust air and give out fresh air,keeping you away from the odor and unpleasant particulars.It's construction decides this model to be long-lasting,maintenance free,By getting one,you are guaranteed to surrounded in a comfortable and ...