Food giant humidifies offices for health and comfort

The Job

Through experience or simply by extension, General Mills also understands and cares about the lives and needs of its employees. The company's wellness program includes on-site physical therapists and a preventive cardiologist. A corporate health department advocates for employees on health-related workplace concerns, one area of concern being indoor air quality.

In response to reports of office air being too dry, the General Mills facilities team analyzed the existing humidification equipment and the relative humidity in their Minneapolis-area buildings, where winters are desert dry.

"The main driver for this analysis was a new call-in service for building service calls to our maintenance department back in the mid 1990s," recalls Tim Weiss, the company's facilities team leader at the time. "We trended and categorized these calls and noticed that wintertime complaints of office spaces being dry were common, especially when the outside temperature was below zero."

Complaints about static shocks and requests for printer support also increased during winter months, according to the call logs. Static shocks are a nuisance, but static electricity in computers and other office equipment can be very costly. Even a small amount of energy in a static spark can ruin a circuit board or cause serious damage to a hard drive.

General Mills campus in Golden Valley, MN. This buildings' air handlers, new and retrofitted, are equipped with centrally controlled DriSteem humidifiers. 

The Challenge

Two trends emerged during the equipment analysis. One, the existing humidifiers tended to be undersized for winter humidification demand. And two, they were not on preventive maintenance schedules. Hidden away in air handlers and seldom needing attention, some of the humidifiers were serviced on a reactionary basis or even shut off year round. Clearly, the existing humidification systems were not meeting the needs of the facility.

The Solution

As a result of the analysis, and with buy-in from the on-site health department, the facilities team recommended equipment updates and a new approach to humidifier maintenance.

"We set a standard that all future air handler purchases include steam humidification systems sized for winter," explains Weiss. "We also upgraded the undersized systems and wired them into the building automation system for centralized monitoring and control." Aside from convenience, central monitoring would also provide a means for tracking humidifier performance and scheduling shutdowns for preventive maintenance.

General Mills' Minneapolis humidification program was completed by the summer of 1997.

The Results

"We were amazed the following winter by the decreased number of calls on dryness, static electricity, and printer performance calls," said Weiss. 

On sub-zero winter days in Minnesota, most humidified buildings form condensation on the windows. An additional benefit of centralized control was the ability to prevent window condensation. 

"We addressed the condensation issue that first winter by experimenting with various conditions. We came up with a building-wide program that lowered the relative humidity when outside temperatures plunged below zero," said Weiss. "By now, the humidification systems have been modified even more as controls have evolved, but the premise of the humidification standard remains the same."

DriSteem is pleased to provide the key components for meeting a health- and comfort-focused humidification standard.  

A sampling of the steam dispersion panels in the air handlers of General Mills' Minneapolis buildings

Resources

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