Operating rooms in acute care hospitals must maintain relative humidity between 20% and 60%, per ASHRAE Standard 170 and the FGI Guidelines, which underpin CMS Conditions of Participation. That range isn’t universal: ambulatory surgery centers accredited by ACHC...
Humidity in cleanrooms governs particle behavior, electrostatic discharge (ESD) risk, and microbial growth, which is why relative humidity (RH) is a controlled parameter under ISO 14644 and GMP frameworks rather than a comfort variable. This guide covers the three...
Hospitals must maintain relative humidity within ranges that vary by space type. Under ANSI/ASHRAE/ASHE Standard 170-2021, operating rooms require 20 to 60% RH, while most patient care areas fall within 30 to 60%. These aren’t comfort thresholds, they’re...
Non-wetting humidification is any humidity control method that raises relative humidity (RH) to target levels without depositing moisture on surfaces, equipment, or products. This article explains the physics that determine whether a humidification system wets...
Commercial mold testing isn’t a single test, it’s a structured process combining air sampling, surface sampling, moisture assessment, and HVAC inspection, with results measured against action levels and followed by documented remediation and clearance. The...
When indoor relative humidity drops below 30% RH, it compromises the physiological defenses that patients depend on during recovery. Mucociliary clearance slows, epithelial barriers weaken, and airborne pathogen transmission increases. This article covers the...
An in-duct humidifier is a unit mounted inside an air handling unit (AHU) or a dedicated duct section. It introduces moisture directly into the moving airstream as part of a commercial HVAC system. This article covers how in-duct humidifiers mount and operate within...
An air handler, or air handling unit (AHU), is the indoor enclosure in a commercial heating, ventilation, and air conditioning (HVAC) system that houses the components responsible for moving, filtering, and conditioning air before it is distributed through the...
Maintaining relative humidity between 40% and 60% in hospital environments reduces the viability of airborne pathogens, supports respiratory mucosal defenses, and has been associated with lower rates of hospital-acquired infections. This isn’t convention,...
Moisture in the air forms a thin conductive film on surfaces, allowing electrostatic charge to dissipate continuously rather than accumulate to damaging discharge levels. That mechanism is the physical reason why relative humidity (RH) management is a hardware...
