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Design of Ductwork Systems

Upcoming Courses 
Key Areas  
Course Content
Learning Outcomes
Who Should Attend
Course Timings
Course Fees
In-House Training

A full overview and agenda, need to know information, and booking instructions can be found on the individual upcoming course pages. Click on a course below to view.

Upcoming Courses 

Following the recent developments regarding Coronavirus (COVID-19) here in the UK, the decision has been made to cancel all classroom training until further notice. The training team are working hard to find a safe solution, by running the training online; please make sure you are opted in and check our website to receive all updates regarding training.

10 November London Find out more

Key Areas  

This course programme includes ductwork types & characteristics, sizing, velocities, diffuser grille & fan connections, bends, dampers, attenuators, system layout balancing and noise.

Course Content 

Session 1
  • Introduction
  • Duct Sizing Methods: Relationship between volume, size, air velocity and resistance
  • Static, velocity and total pressures and pressure diagram
  • Constant friction, constant velocity and static regain methods
  • Velocity Limits: Limiting velocity for noise in different applications
  • Duct Distribution Systems: Tree system (mains, sub mains and branches)
  • Octopus (modular plant)
  • Ring main

Session 2
  • Plant Connections: Inlet and outlet connections to centrifugal and axial fans
  • Silencers
  • Connections to terminals
  • Flexible connections

Session 3
  • Room Air Distribution: Limits for different terminals
  • Effect of supply temperature
  • Perforated ceilings
  • Displacement ventilation
    Ductwork Types: Circular and rectangular

Session 4
  • Damper Types & Characteristics: Opposed blade, parallel blade, iris and other methods of controlling volume
  • Noise: Brief introduction to noise including sound power and sound pressure, Noise criteria and noise rating and Control of noise
  • Attenuator: Square end, round end and aerofoil. Positioning of attenuators  
  • Commissioning: Brief introduction to good commissioning practice, Design requirements to facilitate commissioning and Interpretation of commissioning records

Learning Outcomes  

The delegates will gain the attention to detail at design stage to minimise problems when commissioning.

Who Should Attend  

Delegates should have had a formal academic (B Eng.) followed by a few years of experience or have been working as Technicians/draftsmen/Cadd operators.

Course Timings 

Registration: 09:15
Start Time: 09:30
Latest Finish: 17:00

Course Fees 

  • Standard Rate: £335 + VAT
  • Members Rate: £285 + VAT

In-house training at your site

Training multiple staff at once provides the opportunity for your organisation to have a training package crafted to your specific needs. In-house training can help your organisation overcome challenges and fill the skills gaps in your workforce. Courses run on a minimum number of six staff*.

For an In-house quote please email the following information to

  1. Name of course
  2. Approximate number of staff
  3. Your site address  

*Minimum numbers for In-house courses outside of the UK may vary

To contact the CIBSE Training Team with a query please

Email: or call: +44 (0)20 8772 3660