Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, mineral wool, or coconut husk
4" intake flange. For medium inflation jobs and exhausting air outside.Exchanges air in a 200 cu. ft. room in 2 minutes. Flange Type: 4 hole square.Motor Hp: 1/80th.