Glossary of Applied Air HVAC Terminology

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Make-Up Air Equipment
Make-up air equipment is designed to draw sufficient outside air into a building to wholly, or partially, offset the amount of air that leaves the building via the exhaust system.  Make-up air may, or may not, be tempered or filtered before being introduced into the building.
Manometer
An instrument that measures air pressure differences between locations. Tubes are usually attached to a manometer and run to the spaces where pressures are measured. Essentially a U-tube partly filled with a liquid, usually water, mercury or a light oil. The pressure exerted on the liquid is indicated by the liquid displaced. A manometer can be used as a differential pressure gage.
Motor
A device that converts electrical energy into mechanical energy. A motor can operate on direct current (DC) or alternating current (AC) voltage supply, not both.