Q: I have a 1995 Ford Windstar, 3.8-liter engine, with 99,500 miles. Now that the weather is turning colder, I’ve noticed my defroster isn’t working. The blower works, but the air comes out through ...

Many power plants regulate fan airflow with mechanical controls, such as dampers. In some applications using fixed-speed motors in combination with dampers may not be the most energy efficient option.

The headline above is a reminder that a fan and a damper, when assembled, become a fan + damper system, which is more than a simple sum of the two individual items of equipment. They may be operated ...

THIS column provides information about the use of outdoor air dampers in hot and humid climates and during hot and humid seasons in temperate climates in commercial buildings. Terms used in this ...