In addition, filters that should be changed frequently are left in place for years, and unemptied water in air-handling systems turns into bacteria-infested slime.

In 2008, the Transit Center was renovated, including improvements to the air-handling system as well as electronic messaging boards.

These calibration gases and other reference gases are compared periodically to determine the instrument sensitivity and to check for possible contamination in the air-handling system.

Any pink that wended down the hall would find refuge here, seeping into the air-handling system through the floor-level vents.

I'm guessing that the air-handling system filters out all odors, and that any verandas are well sheltered from unseemly views.

At the same time, a problem had developed with the building's heating and air-handling system.

What about the exposure to those people who had been working on the air-handling system?

"The air-handling system has been broken down into two or three distribution points rather than one mechanical room on the floor with large ducts coming out."

To clear the atmosphere for proper sniffing, a new air-handling system changes the air three times more rapidly than in a normal office building.

Palm fronds rustle in a breeze not of nature but of the air-handling system.