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Air Distribution Systems

Horizontales
A ring or panel surrounding the blades on a propeller fan to improve fan performance
Sheet metal fittings designed to transition from the branch duct to the receptacle for the register, grille, or diffuser to be installed
The ratio of moisture present in a given sample of air compared to the volume of moisture it can hold when saturated (at dew point), expressed as a percentage
The common unit of measure for rotational speed
The sum of the static pressure and the velocity pressure in an air duct
The temperature measured using a standard thermometer, representing the sensible heat present
Connection points installed on a trunk duct that allow the connection of branch ducts
The temperature at which air becomes saturated with water vapor
A comprehensive chart that presents the important properties of air and water vapor as they relate to each other
The pressure exerted uniformly in all directions by air within a duct system, usually measured in inches of water column (w.c.) or centimeters of water column (cm H20)
Joints that accommodate s change in duct size
Verticales
A special tube housing a second tube used to capture pressure measurements from a moving air stream
The speed at which air is moving, usually measured in feet per minute
The pressure developed in a duct due to the linear movement of air
Temperature measured with a thermometer fitted with a wetted wick wrapped around a sensing bubl
The cumulative resistance of all obstructions and ductwork in an air distribution system beyond the blower assembly itself
A barrier placed over insulation to stop water vapor from passing through the insulation and condensing on a cold surface
To form or arrange into layers
A chamber at the inlet or outlet of an air handling unit