Which devices are used for humidification in commercial buildings?

Which devices are used for humidification in commercial buildings?

• A. Drum-type humidifiers
• B. Flow-through metal filters
• C. Steam jets
• D. Ultraviolet lamps

Answer: (A)

Drum-type humidifiers are used to add moisture to the air in commercial buildings. They work by keeping a rotating drum partially submerged in water; as air passes over the wetted surface, evaporated water increases the humidity of the supply air. This method is well-suited for central HVAC systems in large spaces because it provides reliable, controllable humidity without needing a separate steam boiler, and it integrates smoothly with air-handling equipment. Maintenance focuses on water quality and cleaning to prevent mineral buildup and biofilm. Flow-through metal filters purify air but do not humidify. Steam jets can humidify by injecting steam, but they rely on a steam source and are less common for standard commercial systems. Ultraviolet lamps are used for air disinfection, not for adding moisture.

Drum-type humidifiers are used to add moisture to the air in commercial buildings. They work by keeping a rotating drum partially submerged in water; as air passes over the wetted surface, evaporated water increases the humidity of the supply air. This method is well-suited for central HVAC systems in large spaces because it provides reliable, controllable humidity without needing a separate steam boiler, and it integrates smoothly with air-handling equipment. Maintenance focuses on water quality and cleaning to prevent mineral buildup and biofilm.

Flow-through metal filters purify air but do not humidify. Steam jets can humidify by injecting steam, but they rely on a steam source and are less common for standard commercial systems. Ultraviolet lamps are used for air disinfection, not for adding moisture.