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Why Hospitals Have to Manage Humidity
Healthcare spaces have humidity limits to meet, and winter is when they are hardest to meet. Too dry, and supplies, equipment and people suffer; too damp, and mold follows. The hard part is holding every space in range at the same time.
Dry air in the heating season
ASHRAE/ASHE Standard 170 sets humidity ranges for hospital spaces. For operating rooms and other anesthetizing locations the range is 20 to 60% RH, and CMS strongly recommends staying within it. Some medical devices and supplies also state their own humidity limits in their instructions for use.
Dry air also dries eyes, skin and airways, a common complaint from patients and healthcare workers, and raises the risk of static discharge around sensitive electronics.
Too much moisture, or humidity that swings
Above 60% RH, mold and microbial growth become a risk, and moisture can condense on cold surfaces. Humidity that swings with the weather is also hard to document and harder to defend in an inspection.
The cost of conventional humidification
Many hospitals humidify with steam, which means boiling large volumes of water and then removing the added heat with cooling.
A Smart Fog unit runs on about 0.4 kW at full output, against roughly 8 kW to boil the same 25 lb of water an hour with electric steam.
Non-Wetting Humidification for Healthcare
Smart Fog turns water into dry fog, droplets small enough to evaporate before they reach patients, surfaces or equipment. Sensors and controllers hold each space at its setpoint, so humidity stays steady through the season.
Stable humidity, less static
Holding humidity within 1 to 2% of setpoint keeps rooms inside their limits and helps static charges dissipate around monitors, imaging equipment and other electronics. Static discharge is also a recognized ignition hazard where oxygen is in use.
More comfortable patients and staff
Mid-range humidity eases the dry eyes, skin, noses and throats that are common in heated buildings.
Research has also found that some airborne viruses, including influenza, survive and spread less readily at moderate humidity than in very dry air, one reason many facilities avoid running at the bottom of their allowed range.
Lower energy than steam
Because nothing is boiled, the humidifier uses a fraction of the electricity steam needs.
Evaporation absorbs heat rather than adding it, which helps in spaces that need cooling, such as operating rooms and imaging suites.
There are no boilers, steam lines or drain pans to maintain.
What Controlled Humidity Does for a Hospital
Holding humidity in range supports compliance, comfort and equipment care at the same time:
Easier compliance:
Rooms held inside the ASHRAE 170 ranges your jurisdiction has adopted, with sensor readings that can be logged for documentation.
More comfortable patients and staff:
Fewer complaints of dry eyes, skin and throats through the heating season.
Protected equipment and supplies:
Less static around electronics, and conditions that stay within manufacturers’ stated limits.
Clean, dry surfaces:
No wet floors or condensation from the humidifier, and humidity held below the 60% level where mold becomes a risk.
Hospital Grade Humidifiers From Smart Fog
Whether you need a humidifier in a single hospital room or across a whole wing, systems are modular and can be combined across the facility. Typical lead time is about one week.
ES100 Direct Space Humidifier
Mounts on a wall and humidifies a room directly. Suited to operating rooms, sterile storage, labs and imaging rooms
TS100 In Duct Humidifier
Installs in the air handler or supply duct to humidify every space the duct serves, without drain pans or boilers.
ES100M Portable Industrial Humidifier
A portable unit on wheels for renovations, temporary needs or spaces without a fixed installation.
MS100 Custom Grid System
A custom grid for large open areas such as atriums and central stores, covering up to 10,000 sq ft per system.
FAQs
What humidity should a hospital maintain?
It depends on the space. ASHRAE/ASHE Standard 170 sets 20 to 60% RH for operating rooms and other anesthetizing locations and caps most other spaces at 60%. Check the edition your jurisdiction has adopted, and any limits stated in device and supply instructions for use.
Is this the same as a medical humidifier for patients?
No. Respiratory humidifiers used with ventilators and oxygen therapy are medical devices. When facilities look for a medical grade humidifier for the building, they need a system built to healthcare standards for rooms, wards and air handling, which is what Smart Fog makes.
Can humidity help reduce infection?
It is one factor among many. Studies have found that some airborne viruses, including influenza, survive and spread less readily at moderate humidity than in very dry air. Humidity supports, but does not replace, ventilation, filtration and infection-control practice.
Will a humidifier cause wet surfaces or mold?
Not a Smart Fog system. Dry fog evaporates before it reaches surfaces, and the controls hold humidity below the 60% level where mold becomes a risk. Upkeep is mainly filter changes and periodic inspection.
How does it compare with steam humidification?
Steam boils water, using roughly 8 kW of electricity for every 25 lb of water an hour and adding heat to the space. A Smart Fog unit delivers the same output on about 0.4 kW, adds no heat and has no boiler or drain to maintain.