Chapter 24
Underperformance in A/C Systems Due to Ducting Problems


Consider three rooms, each the same size and construction, and each cooled in a different manner:

• Room 1 is cooled by cold air supplied through a duct.

• Room 2 is cooled using a direct-expansion A/C system.

• Room 3 is cooled using an air-handling unit and cold water from a chiller.

  • 24.1 Sound-Deadening or Insulation Material Added
  • 24.2 Ducts Not Built in Accordance with Calculations
  • 24.3 Breaks in Duct Continuity
  • 24.4 Duct Turning Vane Faults
  • 24.5 Airflow Reduced by Air Filters
  • 24.6 Blocking or Altering a Supply or Return
  • 24.7 Louvered Door Replaced
  • 24.8 Takeoffs Added Reducing Airflow to Other Rooms
  • 24.9 Makeup Air Quantity Increased

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