Maricopa Community Colleges  ABC273   19952-19956 
Official Course Description: MCCCD Approval: 11/28/95
ABC273 19952-19956 LEC 2 Credit(s) 2 Period(s)
Air Balance and Distribution
Installation methods for grilles, diffusers and registers. Equipment and procedures for balancing ductrun systems. Prerequisites: (Indentured status with Associated Builders and Contractors, Inc., and ABC271) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC273   19952-19956 Air Balance and Distribution
1. Define common terminology for air balancing and terms associated with air distribution in a room. (I)
2. Given a formula calculate volume of airflow. (II)
3. Identify air measuring devices and describe their methods of operation. (III)
4. Identify air distribution systems and their major components.(IV)
5. Explain specific air balancing considerations. (V)
6. Describe specific air balance procedures. (VI)
7. Describe procedures for balancing duct system mains with a Pitot tube and anemometer. (VII)
8. Describe the procedures for balancing the airflow at terminal and outlet devices with a velometer. (VIII)
9. Describe air balancing procedures and principles for specific systems. (IX)
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MCCCD Official Course Outline:
 
ABC273   19952-19956 Air Balance and Distribution
    I. Terminology
        A. Primary air
        B. Secondary air
        C. Grille
        D. Register
        E. Diffusers
        F. Throw
        G. Spread
        H. Drop
        I. Aspect ratio
        J. CFM
        K. Other
      II. Volume of Airflow
          A. Cubic feet per minute (CFM) formula
          B. Feet per minute (FPM) formula
          C. Noise criteria (NC)
        III. Air Measuring Devices
            A. Swinging vane anemometer
            B. Alnor anemometer
            C. Rotating vane anemometer
            D. Hot wire anemometer
            E. Balancing hood
          IV. Air Distribution System
              A. Components
                1. Inlets
                2. Outlets
                3. Ceiling diffusers
                4. Floor registers
                5. Elbow fittings
                6. Air movers
              B. Distribution systems
                1. Low-velocity
                2. High-velocity
                3. Variable air volume
            V. Air Balancing Considerations
                A. Air flow
                B. Air Weight
              VI. Balancing Procedures
                  A. Definition
                  B. Altered air flow factors
                  C. Systematic procedures-schematic layout
                VII. Balancing Duct Mains
                    A. Equipment and instruments
                      1. Pitot tube
                      2. Anemometer
                    B. Static pressure
                    C. Velocity pressure
                    D. Total pressure
                  VIII. Terminal Balancing
                      A. Velometers
                      B. Thermometers
                    IX. Thermometer Balancing
                        A. Mixed air system adjustment
                        B. Balancing dual duct systems
                        C. Balancing induction systems
                        D. Measuring temperature rise
                        E. Measuring temperature drop
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