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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Demonstrate knowledge of airflow calculations and principles of airflow in a ventilation circuit 
SAQA US ID UNIT STANDARD TITLE
120355  Demonstrate knowledge of airflow calculations and principles of airflow in a ventilation circuit 
ORIGINATOR
SGB Occupational Health and Safety 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 09 - Health Sciences and Social Services Preventive Health 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular-Fundamental  Level 4  NQF Level 04 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
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 does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
This Unit Standard requires learners to be able to demonstrate knowledge of airflow calculations and principles of airflow in a ventilation circuit. Learners will also be able to demonstrate knowledge of basic calculations relating to pressure and airflow. Learners credited with this Unit Standard are capable of:
  • Selecting methods and instruments for measuring pressures and airflow that are appropriate for specified contexts.
  • Assessing the functionality of instruments used for measuring pressure and airflow to ensure safety, health and productivity.
  • Evaluating the test and calculation results to take appropriate action. 

  • LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    It is assumed that learners are competent in Communication and Mathematical Literacy at NQF level 4. 

    UNIT STANDARD RANGE 
    Specified requirements include legal and site-specific requirements and are contained in one or more of the following documents:

    Legal requirements:
  • Mine Health & Safety Act, 1996 (Act No 29 of 1996), and Regulations
  • Occupational Health and Safety Act (Act No 85 of 1993)
  • Guideline for mandatory Codes of Practice

    Site-specific requirements:
  • Hazard Identification and Risk Assessments (HIRA)
  • Mandatory Codes of Practice
  • SANS documents
  • Occupational Health and Safety Risk Management Programme
  • Managerial Instructions
  • Standard Procedures
  • List of Recorded OH&S Risks
  • Working Guides
  • Equipment and Materials Specifications 

  • Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Demonstrate knowledge of the basic principles of airflow in a ventilation circuit. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The principles of airflow in a ventilation circuit are explained in accordance with specified requirements. 

    ASSESSMENT CRITERION 2 
    The importance of airflow in a ventilation circuit is explained in terms of the consequences to health, safety and production. 

    ASSESSMENT CRITERION 3 
    The basic units of measurement are explained and are according to specified requirements. 

    ASSESSMENT CRITERION 4 
    The definitions pertaining to airflow are given in accordance with specified requirements. 

    ASSESSMENT CRITERION 5 
    The design air velocities in particular airways and ducts are explained according to specified requirements. 

    ASSESSMENT CRITERION 6 
    The importance of designing air velocities for particular airways and ducts is explained in terms of the consequences to health, safety and production. 

    ASSESSMENT CRITERION 7 
    The pressure losses in a ventilation circuit are described and explained according to specified requirements. 

    SPECIFIC OUTCOME 2 
    Assess the functionality of instruments used for airflow determination to ensure safety, health and productivity. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The velocity and volume flow rate of air is calculated in accordance with specified requirements. 

    ASSESSMENT CRITERION 2 
    The velocity and volume flow rates from Pitot tube measurements are calculated according to specified requirements. 

    ASSESSMENT CRITERION 3 
    Calculations involving the use of formulae are in accordance with specified requirements. 

    ASSESSMENT CRITERION 4 
    The airflow rates for airways in parallel and series are calculated according to specified requirements. 

    ASSESSMENT CRITERION 5 
    The size of a regulator is calculated according to specified requirements. 

    ASSESSMENT CRITERION 6 
    The calculation of basic pollutant dilutions, involving mixing of two or more air streams at the same density, is according to specified requirements. 

    SPECIFIC OUTCOME 3 
    Determine airflow rates and circuit pressures using appropriate instruments. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The importance of continuously assessing health and safety hazards and risks is explained in terms of the possible consequences for health, safety and productivity. 

    ASSESSMENT CRITERION 2 
    The pressure difference between two points is determined according to specified requirements. 

    ASSESSMENT CRITERION 3 
    The pressure drop across airways in series and in parallel is calculated in accordance with specified requirements. 

    ASSESSMENT CRITERION 4 
    Natural ventilating pressure (NVP) is calculated in accordance with specified requirements. 

    ASSESSMENT CRITERION 5 
    The pressure loss in a ventilation circuit is calculated according to the Atkinson's formula. 

    ASSESSMENT CRITERION 6 
    The calculation of an unknown element in Atkinson's formula is performed according to specified requirements. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
    Anyone assessing a learner against this unit standard must be registered as an assessor with the relevant ETQA or an ETQA that has a Memorandum of Understanding with the relevant ETQA. Any institution offering learning that will enable achievement of this unit standard must be accredited, as a provider, through the relevant ETQA by SAQA. Moderation of assessment will be overseen by the relevant ETQA according the moderation guidelines in the relevant qualification and the agreed ETQA procedures. 

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    The following embedded knowledge is addressed in an integrated way in the unit standard:
  • Health and safety knowledge.
  • Report writing.
  • Legal and site-specific requirements. 

  • UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Solve problems related to air flow in ventilation circuits and perform basic calculations. 

    UNIT STANDARD CCFO WORKING 
    Work effectively with others as a member of a team/group/organisation/community by accepting, interpreting and delegating instructions correctly, if and when required, in a context-appropriate manner. 

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage themselves and their activities responsibly and effectively by meeting specified requirements, applying correct formulae in calculations, and recommending appropriate action where necessary. 

    UNIT STANDARD CCFO COLLECTING 
    Collect, organise and critically evaluate information to correct for conditions, environmental factors, and limitations that can influence readings, interpret information obtained, and recommend appropriate action. 

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively using visual, mathematics and language skills in the modes of oral and written presentations to record and report analytical results. 

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically (showing responsibility towards the environment and health of others) to select the appropriate methods, formulae and instruments for performing ventilation airflow calculations. 

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrate an understanding of the world as a set of related systems by recommending appropriate actions based on the evaluation of test results and reporting results to relevant designated persons, confirming that a specific observation, inference, action or decision can have an interrelated effect. 

    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 
    N/A 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  79807   Further Education and Training Certificate: Occupational Hygiene and Safety  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered" 
    2021-06-30  As per Learning Programmes recorded against this Qual 


    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.
     
    1. DIGGERS TRAINING AND DEVELOPMENT SERVICES 



    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.