Steam Humidifiers Direct Steam Humidifiers - DSH | ADCA Valsteam ADCA Direct Steam Humidifiers - DSH | ADCA The ADCA DSH series of direct steam injection humidifiers are designed to ensure highly efficient and moisture free steam injection in air ducts and AHU for humidification purposes. These units are completely manufactured from corrosion resistant stainless steel, and are available as plug and play packaged solutions or alternatively as individual... View