What is a fan?
A fan is a rotary-bladed machine which delivers a continuous flow of air or gas at some pressure, without materially
The term "air conditioning", when properly used, now means the total control of temperature, moisture in the air (hum
Modern air conditioning is critical to almost every facet of advancing human activity. Although there have been advances in
For Millennia, people have used fire for heating, the air required to keep the fire going ensured adequate ventilation for