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HVAC BOOK UNIT #18 1-1

Horizontales
A device that covers the opening of return air ductwork.
A method of duct sizing in which each duct section is sized so that the static pressure increases at each takeoff offsets the friction loss in the preceding duct section.
A supply duct system consisting of a plenum box attached to the discharge end of a heating unit with a main duct extending across the length of a building.
The pressure created by air as it travels, such as through a duct.
A piece of flexible material placed between sheet metal collars used to isolate rigid ductwork from the vibrations of an HVAC unit.
The measure of the volume (in cubic feet) of air that passes a given point in one minute (cfm).
The sum of the static and velocity pressures in a duct system.
A supply duct system consisting of a plenum box that is attached to the discharge end of a heating unit with individual small ducts connected from the plenum box to each zone.
Verticales
The left to right pattern and distance from a unit where air velocity decreases below design fpm.
An airflow damper located in the branch takeoff from the trunk duct in a forced-air distribution system.
The force that nonmoving air exerts against surfaces such as ducts; measured in inches of water column (in. WC).
A method of sizing ducts that causes air velocity to be reduced at each branch takeoff.
The distance discharged air flows from a register or diffuser.