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your question was regarding the supply line thus we use the flexible duct to minimize the noise that may take place due the vibration when the machine is on.
Plenum duck is usually being used for the slot diffuser.
so simple flex ducts are flexible and cant design ducts for small areas. flex ducts are most commonly used in toilets because so many toilet chambers. plenum box for uniform flow through terminals
FLEXIBLE DUCT IS USED WHERE THE MINIMUM DISTANCE, WHERE AS PELINIUM BOX IS TO STEP DOWN AND SUPPLY THE AIR OF AS REQUIRED
Flexible Ducts are use to damp / minimize vibration to be transferred from HVAC Ducts to False Ceiling.
Plenum box with sound liner are used to get:
Flexible ducts in general has the following advantages:
1-the cost advantages of flex duct make it a popular choice for many builders.
2-in supply ducts to minimize vibration and noise
Supply PlenumA plenum is an air-distribution box attached directly to the supply outlet of the HVAC equipment that heats or cools the air to make the house comfortable. The ductwork that distributes the heated or cooled air to individual rooms of the house connects to the plenum. The HVAC equipment has a blower that forces heated or cooled air into the supply plenum and from the plenum into the rooms through the supply duct system. Air-cleaning filters may be located in the supply plenum.