Maricopa Community Colleges  ABC275   20052-20086 
Official Course Description: MCCCD Approval: 07/22/08
ABC275 20052-20086 LEC 1 Credit(s) 1 Period(s)
Air Balance
Air balance for delivery of air conditioned air. Includes terminology, calculation of airflow and use of air measuring devices. Air balance procedures for specific systems.
Prerequisites: (Registered apprentice status and ABC209) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC275   20052-20086 Air Balance
1. Define common terminology for air balancing and terms associated with air distribution. (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 air balancing procedures and principles for specific systems. (VI)
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MCCCD Official Course Outline:
 
ABC275   20052-20086 Air Balance
    I. Terminology
        A. Primary air
        B. Secondary air
        C. Grille
        D. Register
        E. Diffusers
        F. Throw
        G. Spread
        H. Drop
        I. Aspect ratio
        J. Cubic feet per minute (CFM)
        K. Other
      II. Airflow calculation
          A. CFM formula
          B. Feet per minute (FPM)
          C. Noise criteria (NC)
        III. Air Measuring devices and operation
            A. Alnor anemometer
            B. Swinging vane anemometer
            C. Rotating vane anemometer
            D. Hot wire anemometer
            E. Balancing hood
          IV. Air distribution systems
              A. Components
                1. Inlets
                2. Outlets
                3. Ceiling diffusers
                4. Floor registers
                5. Elbow fittings
                6. Air movers ABC275Effective Term:
              B. Distribution systems
                1. Low velocity
                2. High velocity
                3. Variable air volume
            V. Air balancing considerations
                A. Airflow
                  1. Principles
                  2. Velocity measurement
                  3. Anemometer use
                B. Air weight
              VI. Balancing Procedures
                  A. Pre-balance checks
                  B. Duct system balancing - mains
                  C. Terminal balancing
                  D. Mixed air system adjustment
                  E. Balancing dual duct systems
                  F. Balancing induction systems
                  G. Measuring temperature rise
                  H. Measuring temperature drop
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