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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Carry out elementary airflow measurements and calculations 
SAQA US ID UNIT STANDARD TITLE
116698  Carry out elementary airflow measurements and calculations 
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Manufacturing and Assembly 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 3  NQF Level 03  4 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard replaces: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
9540  Carry out elementary airflow measurements and calculations  Level 3  NQF Level 03  4   

PURPOSE OF THE UNIT STANDARD 
Carry out calculations involving the dimensions of and the velocity in ducts. Measure the static, velocity and total pressure in a duct and explain their significance. Determine the pressures and the air quantity flowing in a duct. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
Carry out multiplication and division and calculate square roots. Manipulate simple formulas. 

UNIT STANDARD RANGE 
  • Commonly used pressure-measuring instruments, water gauge, incline gauge, electronic instruments.
  • Velocities and pressures as found in the average air-conditioning and ventilation systems. 
    		•

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Carry out calculations involving sizes and areas of square and round ducts. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The area of a square and round ducts is calculated correctly. 

    ASSESSMENT CRITERION 2 
    Given the area the possible sizes of a square or rectangular duct are correctly calculated. 

    ASSESSMENT CRITERION 3 
    Given the area, the diameter of a round duct is correctly calculated. 

    ASSESSMENT CRITERION 4 
    Conversions from meters to millimeters and vice-versa are done correctly. 

    ASSESSMENT CRITERION 5 
    Correct SI units and symbols are used. 

    SPECIFIC OUTCOME 2 
    Carry out elementary airflow calculations. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Given the area and velocity in a duct, the volume flowing is correctly calculated. 

    ASSESSMENT CRITERION 2 
    Given the volume and the area, the velocity is correctly calculated. 

    ASSESSMENT CRITERION 3 
    The velocity pressure of the air is calculated correctly. 

    ASSESSMENT CRITERION 4 
    The velocity of the air is calculated correctly from the velocity pressure. 

    ASSESSMENT CRITERION 5 
    The correct SI units and symbols are used. 

    ASSESSMENT CRITERION 6 
    All units, where required, are converted correctly. 

    SPECIFIC OUTCOME 3 
    Prepare for measuring the air pressure in a duct. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The correct instrumentation is selected and checked for suitability. 

    ASSESSMENT CRITERION 2 
    The most suitable measuring points are selected. 

    ASSESSMENT CRITERION 3 
    Measuring instruments are checked for calibration (where applicable). 

    ASSESSMENT CRITERION 4 
    The correct measuring range is selected (where applicable). 

    SPECIFIC OUTCOME 4 
    Measure air pressures in a duct. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Instrumentation is handled with due care. 

    ASSESSMENT CRITERION 2 
    Pressures are correctly measured. 

    ASSESSMENT CRITERION 3 
    Positive and negative pressures are correctly identified. 

    ASSESSMENT CRITERION 4 
    The relationship between and the effect of the different pressures is explained. 

    SPECIFIC OUTCOME 5 
    Evaluate results. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The effect of density on the pressures is explained. 

    ASSESSMENT CRITERION 2 
    The effect of friction in the duct on the pressures is explained. 

    ASSESSMENT CRITERION 3 
    The normal range of pressures in a duct is indicated. 

    ASSESSMENT CRITERION 4 
    The significance of the pressures is stated and explained. 

    ASSESSMENT CRITERION 5 
    The common instruments used for measuring duct pressures are listed and their uses discussed. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
    Any person wishing to be assessed against this unit standard may apply to an assessment agency, assessor or provider institution accredited by the relevant ETQA, who may appoint a moderator to be present at the assessment.

    The assessor must have knowledge and experience of air-conditioning or refrigeration. 

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • The importance of airflow in air-conditioning, refrigeration and ventilation systems.
  • The importance of selecting the correct position and instrument to measure the pressure.
  • The effect of altitude on air volumes and air pressures required. 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems:
  • Selection of instruments to carry out particular measurements. 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organize and manage myself and my activities:
  • Select correct instrument and decide on correct usage. 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyze, organize and critically evaluate information:
  • Interpretation of results. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically:
  • Appropriate use of instrumentation
  • By understanding the processes involved 
    		•

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    This unit standard is replacing unit standard 9540 - 'Carry out elementary airflow measurements and calculations' - Level 3. 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  48963   National Certificate: Air-Conditioning, Refrigeration and Ventilation  Level 3  NQF Level 03  Passed the End Date -
    Status was "Reregistered"     		 2009-03-12  Was MERSETA until Last Date for Achievement 
    Core  65509   Further Education and Training Certificate: Air-conditioning, Refrigeration and Ventilation  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  MERSETA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    NONE 


    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.