AIR DUCT SERVICING NC II – TESDA COURSE MODULE

TESDA TRAINING REGULATIONS FOR AIR DUCT SERVICING NC II COURSE

The TESDA Course in AIR DUCT SERVICING NC II consists of competencies that a person must achieve to enable him/her to interprets working drawing, fabricates, assembles and installs air ducts using hand and power tools and sheet metal working equipment.

This Qualification is packaged from the competency map of HVAC/R Sector – Air Duct SERVICING)

A student who has achieved this TESDA Course in AIR DUCT SERVICING NC II is competent to be:

• Tinsmith (HVAC/R Worker)

TRAINEE ENTRY REQUIREMENTS

This section specifies the qualifications of trainees and educational experience. Other requirements like health and physical requirements are also stated. Passing entry written examinations may also be indicated if necessary.

• Can communicate both orally and in writing
• Good moral character
• Can perform basic mathematical computation
• Physically and mentally fit

AIR DUCT SERVICING NC II – TRAINING AND REGULATION MODULE

Course Title: AIR DUCT SERVICING
Level: NC II
Nominal Training Duration :

(Basic Competency) 18 Hours
(Common Competency) 212 Hours
(Core Competency) 140 Hours

Total Duration: 370 Hours

This course is designed to equip individual with operational skills to install, service and maintain, troubleshoot and repair Air Duct System In HVAC/R technology in accordance with Duct Construction Standards.

COMPETENCIES REQUIRED IN AIR DUCT SERVICING NC II COURSE

To obtain this TESDA course in AIR DUCT SERVICING NC II, all units prescribed for this qualification must be achieved.

These units of competency comprising this qualification include the following:

UNIT CODE	CORE COMPETENCIES (140 Hours)
HVC723331	Survey site for installation
HVC723332	Fabricate air ducts
HVC723333	Install air duct system
HVC723334	Perform air duct testing
HVC723335	Insulate air ducts
HVC723336	Repair and maintain air duct system
UNIT CODE	COMMON COMPETENCIES (212 Hours)
HVC713201	Prepare materials and tools
HVC311203	Perform mensurations and calculations
HVC713202	Perform basic benchwork
HVC724201	Perform basic electrical works
HVC311204	Maintain tools and equipment
HVC315201	Perform housekeeping and safety practices
HVC311205	Document work accomplished
UNIT CODE	BASIC COMPETENCIES (18 Hours)
500311105	Participate in workplace communication
500311106	Work in a team environment
500311107	Practice career professionalism
500311108	Practice occupational health and safety procedures

This section gives the details and contents of the units of competency required in AIR DUCT SERVICING NC II. These units of competency are categorized into basic, common and core competencies.

CORE COMPETENCIES (AIR DUCT SERVICING NC II)

This section gives the details of the contents of the core units of competency required in AIR DUCT SERVICING NC II.

UNIT OF COMPETENCY: SURVEY SITE FOR AIR DUCT INSTALLATION
UNIT CODE : HVC723331

This unit covers the knowledge, skills and attitude in surveying site for installation of air duct system such as exhaust and fresh air ducts and ventilating ducts.

1. Prepare for surveying site
   • Work instructions are read and interpreted to determine job requirements
   • Technical plan/drawing is interpreted as per job requirements
   • Equipment, tools, and materials are prepared according to plan and specifications
   • Components of HVAC/R ductworks system to be installed are identified as per job requirements
2. Survey site
   • Site is surveyed as per approved sketch/plans and permits
   • Alteration/comments are prepared as per survey conducted
   • Result of survey is prepared and submitted to appropriate personnel/ supervisor

UNIT OF COMPETENCY: FABRICATE AIR DUCTS
UNIT CODE : HVC723332

This unit covers the knowledge, skills and attitudes required to fabricate air ducts for HVAC/R technology in accordance with duct construction standards. It includes preparing materials , lay-out , cutting , bending and duct assembly .

1. Prepare of air duct fabrication requirements
   • Work instructions are read and interpreted
   • Air duct requirements are prepared and checked for damages in accordance with specifications
   • Tools and equipment are selected in accordance with job requirements
   • Work is undertaken in line with safety rules and regulations
2. Lay-out air ducts
   • Patterns are prepared/checked according to established procedures
   • Sheet metal is laid-out in conformity with design and specification
   • Patterns are carefully measured and free of burrs
   • Materials are used economically in accordance with established procedures
3. Cut and bend sheet metal
   • Sheet metal is cut in accordance with the lay out using manual and power hand tools
   • Standard cutting process is applied and observed
   • Cutting edge is maintained sharp
   • Straight curve and circular cutting is done with correct tool selection
   • Work is undertaken in line with safety requirements
   • Sheet metals are folded in accordance with tolerances of cuts and bends
   • Waste materials are disposed according to established procedures
4. Assemble air ducts
   • Dimension is checked as specified on the drawing
   • Longitudinal seam is aligned
   • Duct is free of wrinkles or dents
   • Joint connections are selected in accordance with job requirements
   • Joints are checked to ensure fit and air tightness in line with standard procedure
   • Work is undertaken in line with safety requirements

UNIT OF COMPETENCY : INSTALL AIR DUCT SYSTEM
UNIT CODE : HVC723333

This unit covers the knowledge, skills and attitudes required to install air ducts in accordance with duct construction standards. It includes preparation of materials, erection of platforms and scaffoldings, and installation of hangers and supports

1. Prepare air duct installation requirements
   • Work instructions are read and interpreted to determine air duct requirements
   • Tools and Equipment are selected in accordance with job requirements
   • Area of work is cleaned and appropriate signs and warnings is placed
   • Supplies and materials are prepared and checked in accordance with the specifications
2. Install/ Erect platforms and scaffoldings
   • Platforms & scaffoldings are selected accordance with job requirements
   • Platforms and scaffoldings are rigidly erected according to established procedures
   • Work is undertaken in line with safety rules and regulations
   • Signs and warning are properly place in appropriate location
3. Install hangers & supports
   • Hangers & supports are selected in accordance with the plan
   • Hangers and supports are fabricated in conformity with design and specification
   • Dimensions and distance are observed according to specification and drawing
   • Hangers and supports are attached to the structural framing and concrete slabs preventing the anchor from puncturing the metal decking
   • Vertical duct is fastened with minimum of 2 supports at each floor.
4. Install air duct system and its components
   • Duct work is aligned at connections within 3mm tolerances and with smooth internal surfaces
   • Air ducts are installed with suitable ties, braces, hangers and anchors to prevent movement, drumming, buckling and sagging under all operating conditions
   • Installed air ducts are located in conformity with the approved plan/design
   • Air ducts are installed achieving air tightness and noiseless system
   • Air terminals are installed and aligned in accordance with drawings and designs
   • Work is undertaken in line with safety requirements
   • Safety requirements are observed through out the process

UNIT OF COMPETENCY : PERFORM AIR-DUCT TESTING
UNIT CODE : HVC723334

This unit covers the knowledge, skills and attitudes required to perform air-ducts testing in accordance with Duct Construction Standards

1. Prepare for air duct test
   • Work instructions are read and interpreted to determine job requirements
   • Materials, tools & equipment are selected in accordance with job requirements
   • Testing method and procedures are determined/prepared in accordance with standard operating procedure
   • Pre-testing is performed and complied according to procedures laid down in system documents
   • PPE is prepared and checked in line with job requirements
2. Test air duct
   • Testing materials / instruments are prepared and checked
   • Duct lengths are not in excess of 30 meters for vertical ducts and not in excess of 45 meters for horizontal ducts
   • Air duct system is checked for leaks applying light / smoke test method
   • Joints are checked to ensure fit and air tightness in line with standard procedure
   • Leaks are repaired according to system requirements
   • Work is undertaken in line with safety rules and regulations

UNIT OF COMPETENCY : INSULATE AIR DUCTS
UNIT CODE : HVC723335

This unit covers the knowledge, skills and attitudes required to insulate air ducts. It includes preparation of insulation requirements and applying duct liners

1. Prepare insulation materials and requirements
   • Work instructions and plans are read and interpreted to determine insulation requirements
   • Insulating/sealing/adhesive materials are checked in accordance with specification and insulation requirements
   • Insulation requirements are prepared and checked for damage according to established procedures
   • Tools and instruments are identified and prepared according to job requirements
2. Insulate air ducts
   • Insulation of air ducts is tightly fitted with no sag
   • All connections or joints are sealed according to air duct requirements
   • Work is undertaken in line with safety requirements
   • Waste materials are disposed in accordance with established disposal procedures
3. Apply duct liners
   • Air duct linings are checked in accordance with approved material specifications
   • Lining is applied in accordance with manufacturer’s instructions
   • Air duct is checked/tested for leaks and damages in accordance with system requirements
   • Air distribution system is checked in accordance with approved design and plan
   • Work is undertaken in line with safety requirements

UNIT OF COMPETENCY: REPAIR and MAINTAIN AIR DUCT SYSTEM
UNIT CODE : HVC723336

This unit covers the knowledge, skills and attitudes required to repair and maintenance air ducts system in accordance with Duct Construction Standards.

1. Evaluate condition of existing air duct system
   • Visual inspection of air duct system is performed and any signs of damage are recorded and reported
   • Data is analyzed and evaluated according to system requirements
   • Materials are checked and prepared consistent with job requirements
   • Forms and documents are secured and prepared according to established procedures
   • Appropriate PPE is selected in line with safety rules and regulations
2. Repair / Replace damaged air duct system and components
   • System components are inspected and tested in accordance with established procedures
   • Faults and damages are identified and diagnosed in accordance with system requirements
   • Tools and equipment are selected in accordance with required tasks
   • Faulty components are replaced/repaired according to design
   • Work is undertaken in line with safety requirements including use of appropriate PPE
3. Perform preventive maintenance
   • Testing tools and instruments are prepared in accordance with system requirements
   • Inspection and testing is performed according to air duct system principles and requirements
   • Air distribution system are checked and airflows are balanced according to established procedures
   • Maintenance records/service reports are accomplished in accordance with standard policies and procedures

COMMON COMPETENCIES

UNIT OF COMPETENCY: PREPARE MATERIALS AND TOOLS
UNIT CODE : HVC713201

This unit covers the knowledge, skills and attitudes in identifying, requesting and receiving construction materials and tools based on the required performance standards.

1. Identify materials
   • Materials are listed as per job requirements
   • Quantity and description of materials conformed to the job requirements
   • Tools and accessories are identified according to job requirements
2. Requisition materials
   • Materials and tools needed are requested according to the list prepared
   • Request is done as per company standard operating procedures
   • Substitute materials and tools are provided without
     sacrificing cost and quality of the work
3. Receive and inspect materials
   • Materials and tools issued are inspected as per quantity and specification
   • Tools, accessories and materials checked for damages according to enterprise procedures
   • Materials and tools are set aside to appropriate location nearest to the workplace

UNIT OF COMPETENCY: INTERPRET TECHNICAL DRAWINGS AND PLANS
UNIT CODE : HVC311202

This unit covers the knowledge, skills and attitudes in analyzing and interpreting symbols, data and work plan based on the required performance standards.

1. Analyze signs, symbols and data
   • Technical plans are obtained according to job requirements
   • Signs, symbols and data are identified according to job specifications
   • Signs symbols and data are determined according to classification or as appropriate in drawing
2. Interpret technical drawings and plans
   • Necessary tools, materials and equipment are identified according to the plan
   • Supplies and materials are listed according to specifications
   • Components, assemblies or objects are recognized as required
   • Dimensions are identified as appropriate to the plan
   • Specification details are matched with existing/available resources in line with job requirements
   • Work plan is drawn following the specifications
3. Apply freehand sketching
   • Where applicable, correct freehand sketching is produced in accordance with the job requirements

UNIT OF COMPETENCY: OBSERVE PROCEDURES, SPECIFICATIONS AND MANUALS OF INSTRUCTION
UNIT CODE : HVC311201

This unit covers the knowledge, skills and attitudes in identifying, interpreting, applying services to specifications and manuals, and storing manuals.

1. Identify and access specification/manuals
   • Appropriate manuals are identified and accessed as per job requirements
   • Version and date of manual is checked to ensure correct specification and procedure are identified
2. Interpret manuals
   • Relevant sections, chapters of specifications/ manuals are located in relations to the work to be conducted
   • Information and procedure in the manual are interpreted in accordance to industry practices
3. Apply information in manual
   • Manual is interpreted according to job requirements
   • Work steps are correctly identified in accordance with manufacturer’s specification
   • Manual data is applied according to the given task
   • All correct sequencing and adjustments are interpreted in accordance with information contained on the manual or specifications
4. Store manuals
   • Manual or specification are stored appropriately to ensure prevention of damage, ready access and updating of information when required in accordance with company requirements

UNIT OF COMPETENCY: PERFORM MENSURATIONS AND CALCULATIONS
UNIT CODE : HVC311203

This unit covers the knowledge, skills and attitudes in identifying and measuring objects based on the required performance standards.

1. Select measuring instruments
   • Object or component to be measured is identified, classified and interpreted to the appropriate regular geometric shape
   • Measuring tools are selected/identified as per object to be measured or job requirements
   • Correct specifications are obtained from relevant sources
   • Appropriate measuring instruments are selected according to job requirements
   • Alternative measuring tools are used without sacrificing cost and quality of work
2. Carry out measurements and calculations
   • Accurate measurements and calculations are obtained to job requirements
   • Alternative measuring tools are used without sacrificing cost and quality of work
   • Calculation needed to complete work tasks are performed using the four basic process of addition (+), subtraction (-), multiplication (x) and division (/) including but not limited to: trigonometric functions, algebraic computations
   • Calculations involving fractions, percentages and mixed numbers are used to complete workplace tasks
   • Numerical computation is self-checked and corrected for accuracy
   • Instruments are read to the limit of accuracy of the tool
   • Systems of measurement identified and converted according to job requirements/ISO
   • Workpieces are measured according to job requirements

UNIT OF COMPETENCY: PERFORM BASIC BENCHWORKS
UNIT CODE : HVC713202

This unit covers the knowledge, skills and attitudes in preparing materials, tools and equipment, lay-outing dimensions and performing basic benchwork based on the required performance standards.

1. Prepare materials, tools and equipment
   • Work plan is interpreted to determine job requirements
   • Materials, tools and equipment are identified and prepared according to job requirements
   • Materials are checked according to the required specifications
   • Tools and equipment conditions are checked following the standard operating procedures (SOPs)
2. Lay-out and mark dimensions/features on workplace
   • Metallic and non-metallic materials are selected according to the requirements specified in the blueprint
   • Dimensions/features are laid-out/marked according to job specifications/blueprint and within the required tolerance
   • Dimensions are checked against the actual work plan
3. Perform required basic metal works
   • Work instructions are followed to ensure work safety
   • Basic metal works are performed applying knowledge on safety procedures and according to job requirements
   • Workpieces are clamped in workholding device to avoid damage and accidents
   • Work pieces are cut, chipped or filed according to required measurements, tolerance specified in the blueprint and free from burrs and sharp edges
   • Drilling is performed according to recommended sequence and specifications
   • Proper usage of materials, tools and equipment is observed
   • Appropriate PPE and safety procedures are applied
   • Worksite is cleaned and cleared of all debris and left in safe state in accordance with OHS regulations

UNIT OF COMPETENCY: PERFORM BASIC ELECTRICAL WORKS
UNIT CODE : HVC724201

This unit covers the knowledge, skills and attitudes in preparing materials, tools and equipment, testing electrical components and basic repairing in electricity based on the required performance standards.

1. Prepare electrical tools and test instruments
   • Work plan is interpreted to determine job requirements
   • Electrical tools and instruments are identified and prepared according to job requirements
   • Electrical tools and instruments are checked for conditions and calibrated as required
2. Test power supply and electrical components
   • Instruments are tested in accordance with PEC
   • Power supply and electrical components are checked in accordance with manufacturer’s specifications/PEC
   • Defects of power supply and electrical components are identified and recorded
   • Safe working habits is observed
3. Perform basic electrical repair
   • Work instructions are followed to ensure safety work
   • Loose connections are tightened in accordance with PEC
   • Defective electrical components are replaced and tested in accordance with PEC
   • Work place is cleaned and in safe state in line with OHSA regulations

UNIT OF COMPETENCY: MAINTAIN TOOLS AND EQUIPMENT
UNIT CODE : HVC311205

This unit covers the knowledge, skills and attitudes in checking condition, performing preventive maintenance and storing of tools and equipment based on the required performance standards.

1. Check condition of tools and equipment
   • Materials, tools and equipment are identified according to classification and job requirements
   • Non-functional tools and equipment are segregated and labeled according to classification
   • Safety of tools and equipment are observed in accordance with manufacturer’s instructions
   • Condition of PPE are checked in accordance with manufacturer’s instructions
2. Perform basic preventive maintenance
   • Appropriate lubricants are identified according to types of equipment
   • Tools and equipment are lubricated according to preventive maintenance schedule or manufacturer’s specifications
   • Measuring instruments are checked and calibrated in accordance with manufacturer’s instructions
   • Tools are cleaned and lubricated according to standard procedures
   • Defective instruments, equipment and accessories are inspected and replaced according to manufacturer’s specifications
   • Tools are inspected, repaired and replaced every after use
   • Work place are cleaned and in safe state in line with OHSA regulations
3. Store tools and equipment
   • Inventory of tools, instruments and equipment are conducted and recorded as per company practices
   • Tools and equipment are stored safely in appropriate locations in accordance with manufacturer’s specifications or company procedures

UNIT OF COMPETENCY : PERFORM HOUSEKEEPING AND SAFETY PRACTICES FOR RAC SERVICING
UNIT CODE : HVC7315201

This unit covers the knowledge, skills and attitudes needed to work safely in the workplace including sorting, cleaning and dispensing materials, tools and equipment, identifying and minimizing hazards, responding and recording accidents and following basic security.

1. Sort materials, tools and equipment
   • Materials, tools and equipment are classified according to its kinds
   • Appropriate areas for materials, tools and equipment are designated
2. Clean workplace area, materials, tools and equipment
   • Cleaning materials are identified and used as per procedure
   • Workplace areas, materials, tools and equipment are cleaned as per company practices
   • Workplace are in safe state in accordance with safety regulations/company practices
3. Systematize dispensing and retrieval of materials, tools and equipment
   • Systems for requesting, borrowing and returning of materials, tools and equipment is in-place and implemented
   • Forms used are completely filled-up and filed
   • Borrowed tools, and equipment are returned to designated area
   • Consumable materials are requested in exact quantity
4. Identify and minimize/ eliminate hazards
   • Hazards in the work area are recognized and reported to designated personnel and appropriate control actions are taken
   • Workplace policies and procedures for controlling risks are established and followed accurately
   • Workplace procedures for dealing with emergencies are followed whenever necessary within the scope o
     responsibilities and competencies
   • Safety signs and hazard warnings are displayed and observed at all times in line with workplace health and safety regulations
   • Equipment and safety devices/PPE are used/handled according to company or manufacturer’s procedures and guidelines
   • Work areas are kept clean, free from obstacles and emergency exits are know and kept clear at all times
   • Safe manual handling/fighting techniques and safe equipment operation techniques are employed at all times
5. Respond and record accidents
   • Workplace accidents are identified
   • Workplace emergency first-aid procedures/treatment are followed/carried out correctly in accordance with standards/regulations and enterprise procedures/policies
   • Medical assistance/rescue is coordinated with concerned personnel in line with organizational policies
   • Accident/incident records maintained in accordance with standard operating procedures
6. Follow basic security
   • Security policies/procedures are followed according to enterprise practices and appropriate legislation
   • Security related events are recorded/reported on the relevant forms
   • Staff are advised of enterprise security procedures and correct methods of implementation

UNIT OF COMPETENCY: DOCUMENT WORK ACCOMPLISHED
UNIT CODE : HVC311205

This unit covers the knowledge, skills and attitudes in documenting work accomplished.

1. Identify forms and data
   • Forms are selected based on the reports to be prepared
   • Data are collected based on the reports to be prepared
2. Prepare reports
   • Reports are completed using standard form as per company procedures
   • Reports provide details of work completed, further action to be taken and other details as per company procedures
   • Reports are completed and submitted within specified time to the concerned personnel/supervisor

BASIC COMPETENCIES

UNIT OF COMPETENCY : PARTICIPATE IN WORKPLACE COMMUNICATION
UNIT CODE : 500311105

This unit covers the knowledge, skills and attitudes required to gather, interpret and convey information in response to workplace requirements.

1. Obtain and convey workplace information
   • Specific and relevant information is accessed from appropriate sources
   • Effective questioning, active listening and speaking skills are used together and convey information
   • Appropriate medium is used to transfer information and ideas
   • Appropriate non- verbal communication is used
   • Appropriate lines of communication with supervisors and colleagues are identified and followed
   • Defined workplace procedures for the location and storage of information are used
   • Personal interaction is carried out clearly and concisely
2. Participate in workplace meetings and discussions
   • Team meetings are at ended on time
   • Own opinions are clear expressed and those of others are listened to without interruption
   • Meeting inputs are consistent with the meeting purpose and established protocols
   • Workplace interactions are conducted in a courteous manner
   • Questions about simple routine workplace procedures and matters concerning working conditions of employment are asked and responded to.
   • Meetings outcomes are interpreted and implemented
3. Complete relevant work related documents
   • Range of forms relating to conditions of employment are completed accurately and legibly
   • Workplace data is recorded on standard workplace forms and documents
   • Basic mathematical processes are used for routine calculations
   • Errors in recording information on forms/documents are identified and properly acted upon
   • Reporting requirements to supervisor are completed according to organizational guidelines

UNIT OF COMPETENCY : WORK IN TEAM ENVIRONMENT
UNIT CODE : 500311106

This unit covers the skills, knowledge and attitudes to identify role and responsibility as a member of a team.

1. Describe team role and scope
   • The role and objective of the team is identified from available sources of information
   • Team parameters, reporting relationships and responsibilities are identified from team discussions and appropriate external sources.
2. Identify own role and responsibility within team
   • Individual role and responsibilities within the team environment are identified.
   • Roles and responsibility of other team members are identified and recognized.
   • Reporting relationships within team and external to team are identified.
3. Work as a team member
   • Effective and appropriate forms of communications used and interactions undertaken with team members who contribute to known team activities and objectives.
   • Effective and appropriate contributions made to complement team activities and objectives, based on individual skills and competencies and workplace context.
   • Observed protocols in reporting using standard operating procedures.
   • Contribute to the development of team work plans based on an understanding of team’s role and objectives and individual competencies of the members.

UNIT OF COMPETENCY : PRACTICE CAREER PROFESSIONALISM
UNIT CODE : 500311107

This unit covers the knowledge, skills and attitudes in promoting career growth and advancement.

1. Integrate personal objectives with organizational goals
   • Personal growth and work plans are pursued towards improving the qualifications set for the profession
   • Intra- and interpersonal relationships is are maintained in the course of managing oneself based on performance evaluation
   • Commitment to the organization and its goal is demonstrated in the performance of duties
2. Set and meet work priorities
   • Competing demands are prioritized to achieve personal, team and organizational goals and objectives.
   • Resources are utilized efficiently and effectively to manage work priorities and commitments
   • Practices along economic use and maintenance of equipment and facilities are followed as per established procedures
3. Maintain professional growth and development
   • Trainings and career opportunities are identified and availed of based on job requirements
   • Recognitions are sought/received and demonstrated as proof of career advancement
   • Licenses and/or certifications relevant to job and career are obtained and renewed

UNIT OF COMPETENCY : PRACTICE  OCCUPATIONAL HEALTH AND SAFETY PROCEDURES
UNIT CODE : 500311108

This unit covers the outcomes required to comply with regulatory and organizational requirements for occupational health and safety.

1. Identify hazards and risks
   • Safety regulations and workplace safety and hazard control practices and procedures are clarified and explained based on organization procedures
   • Hazards/risks in the workplace and their corresponding indicators are identified to minimize or eliminate risk to co-workers, workplace and environment in accordance with organization procedures
   • Contingency measures during workplace accidents, fire and other emergencies are recognized and established in accordance with organization procedures
2. Evaluate hazards and risks
   • Terms of maximum tolerable limits which when exceeded will result in harm or damage are identified based on threshold limit values (TLV)
   • Effects of the hazards are determined
   • OHS issues and/or concerns and identified safety hazards are reported to designated personnel in accordance with workplace requirements and relevant workplace OHS legislation
3. Control hazards and risks
   • Occupational Health and Safety (OHS) procedures for controlling hazards/risks in workplace are consistently
     followed
   • Procedures for dealing with workplace accidents, fire and emergencies are followed in accordance with organization OHS policies
   • Personal protective equipment (PPE) is correctly used in accordance with organization OHS procedures and practices
   • Appropriate assistance is provided in the event of a workplace emergency in accordance with established organization protocol
4. Maintain OHS awareness
   • Emergency-related drills and trainings are participated in as per established organization guidelines and procedures
   • OHS personal records are completed and updated in accordance with workplace requirements

DEFINITION OF TERMS

• Air Distribution – the process of distributing conditioned air into a confined space.
• Air Duct – a tubular or rectangular passageway for air distribution to a various locations in a building.
• Air Filtration – process whereby air passes into or out of an enclosed area through cracks and other opening in the structure.
• Anemometer –an instrument for measuring the velocity of air in a ducts.
• ASHRAE – American Society of Heating, Refrigeration and Air Conditioning Engineers
• ASTM – American Society for Testing Materials
• Attenuation – the sound reduction process in which sound energy absorbed or diminished in intensity as the result of energy conversion from sound to motion or heat.
• Bending – a working process causing a deformation of the work pieces without chips removal.
• Check – to verify, inspect , or test an RAC SERVICE component for satisfactory condition with the use of an instrument or a device.
• Dampers – a device used to vary the volume of air passing through an air outlet, inlet or duct.
• Diffuser – a square or circular facing devices that cover the supply opening in a ceiling.
• Ducts Materials – are sheet metal, aluminum, fiberglass and plastic.
• Fan – a mechanical device for moving air.
• Grilles – a covering for opening through which air passes.
• Hem – a simple fold at the raw edges of the metal to prevent from cutting.
• Louver – an assembly of sloping vanes intended to permit air to pass through and to inhibit transfer of water droplets.
• NFPA – National Fire Protection Association.
• Register – grilles fitted with damper to control the quantity of air passing through it.
• Returned Air – air returned from conditioned or refrigerated.
• Riveting – a permanent method of fastening metal together.
• Scaffolding –is a temporary modular system of metal pipes forming a framework use to support peoples and materials in the constructions.
• SMACNA – Sheet Metal and Air Conditioning Contractors National Association.
• Sheet Metal – any kind of metal that has been formed into sheets.
• Sound – the sensation perceived by the human ear resulting from rapid fluctuations in air pressure.
• Ventilation – the process of supplying or removing air by natural or mechanical means to or from space