SeQual was a manufacturer of gas separation equipment. Its technology enabled Medical and Commercial oxygen, nitrogen, and hydrogen concentrators and generators.
SeQual was acquired by Chart Industries in 2011 and was known as Chart SeQual Industries. Upon Chart's acquisition of AirSep, its products were marketed under Chart's Biomedical Division under the name Caire. SeQual and AirSep products are now sold by Caire Inc.