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HVAC BOOK UNIT #18 1-2

Horizontales
The number of sheet metal sheets that, when stacked together, equals 1''.
The decrease in air pressure due to the friction created when air moves through a duct.
The speed air moves from one point to another through ductwork, a register, or a grill; measured in feet per minute (fpm).
The area from the front of a register or diffuser to the point where air velocity drops below 50 fpm.
A method of sizing ductwork that sets static pressure approximately equal at each branch takeoff in a distribution system.
A section of duct that has the new unit discharge size on one side and the old plenum size opening on the other.
Verticales
The total area of a duct outlet opening (hole size) minus the area that is used by the register or diffuser slots, vanes, and frame located within the outlet opening.
A supply duct system consisting of a single duct loop that connects all outlets (registers) together and includes supply ducts.
A condition that results when air travels directly from a supply outlet (register or diffuser) to a return inlet (grill) without heating or cooling a building space or room.
A supply duct system consisting of a plenum box attached to the discharge end of a heating unit with a plenum that gets progressively smaller and ducts that branch to individual rooms extending along the length of the main duct.
The pressure drop per unit length of duct for a given size of duct at a particular flow rate.