Air Distribution Systems (Design)
I. Course Prefix/Number: AHR 204
Course Name: Air Distribution Systems (Design)
Credits: 3 (3 lecture; 0 lab)
III. Course (Catalog) Description
Course covers air moving and treating equipment, and distribution of air using appropriate devices. Content includes blower performance; static and dynamic pressures and pressure drop due to friction; sizing and selection of ductwork and blowers, diffusers, registers and grilles; and evaluation of system performance. This is a classroom course only.
IV. Learning Objectives
- Design the proper distribution pattern for the structure
- Compute the correct duct size
- Select motor and blower size
- Define the size of the complete air distribution system
V. Academic Integrity and Student Conduct
• plagiarism (turning in work not written by you, or lacking proper citation),
• falsification and fabrication (lying or distorting the truth),
• helping others to cheat,
• unauthorized changes on official documents,
• pretending to be someone else or having someone else pretend to be you,
• making or accepting bribes, special favors, or threats, and
• any other behavior that violates academic integrity.
There are serious consequences to violations of the academic integrity policy. Oakton's policies and procedures provide students a fair hearing if a complaint is made against you. If you are found to have violated the policy, the minimum penalty is failure on the assignment and, a disciplinary record will be established and kept on file in the office of the Vice President for Student Affairs for a period of 3 years.
Please review the Code of Academic Conduct and the Code of Student Conduct, both located online at
VI. Sequence of Topics
- Purpose of Air Distribution Systems
- Basic Components
- Pressure - Atmospheric, Gauge, Absolute
- Total Friction Loss in Duct
- Fan Conversion Pressure Gain/Loss
- Pressure Drop Through Components
- Duct Sizing’s
- Velocity Reduction Method
- Equal Friction Method
- Static Regain Method
- Diffusers, Registers, Grilles
- Total System - Residential
- Total System - Commercial
- Testing and Balancing
VII. Methods of Instruction
Course may be taught as face-to-face, hybrid or online course.
VIII. Course Practices Required
- The maximum allowed absences are six (6). Any more will result in a failing grade.
(Three absences will lower your grade by one letter grade).
- All quizzes and exam must be completed.
- Three tardiness will be equal to one absence.
- Do not leave the class for the evening without notifying your instructor.
- Lecture attendance is mandatory.
IX. Instructional Materials
Books to be chosen by the instructor.
X. Methods of Evaluating Student Progress
XI. Other Course Information
Three absences lowers the final letter grade three letters. Six absences will result in failure of the course. All appropriate safety precautions must be observed during lab sessions. Any accident must be reported immediately. The lab must be cleaned and all equipment picked up before leaving.
If you have a documented learning, psychological, or physical disability you may be entitled to reasonable academic accommodations or services. To request accommodations or services, contact the Access and Disability Resource Center at the Des Plaines or Skokie campus. All students are expected to fulfill essential course requirements. The College will not waive any essential skill or requirement of a course or degree program.
Oakton Community College is committed to maintaining a campus environment emphasizing the dignity and worth of all members of the community, and complies with all federal and state Title IX requirements.
Resources and support for
- pregnancy-related and parenting accommodations; and
- victims of sexual misconduct
Resources and support for LGBTQ+ students can be found at www.oakton.edu/lgbtq.