HVAC Course > Air Distribution System

Return Duct Design

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Electric heat pumps must be tested to UL 559 or UL 1995 standards. A 3.5 tonne heat pump is an example. For each 1000 BTU of cooling, the duct for this system must be sized utilising 6 square inches of transparent duct space. 12,000 BTU are contained in each tonne of cooling.

Return ducts are typically found in corridors, under stairwells, or in more open parts of your property. They must be properly installed and unobstructed. This positioning assures that they will be able to pull in sufficient air to return to the HVAC equipment.

Your Return Ducts' Dimensions:

  • If you're only installing one or two return vents, a 12-inch return is recommended for 2-ton and lesser units. For ages 3 and above, 14 inches is recommended. For 4 tonne systems, 16-inch returns should suffice, however 5 tonne systems may require 18-inch returns.

No, except in extreme instances where a closed chamber is temporarily under negative air pressure, an air return cannot be too large. Return vents are essential to the proper operation of any HVAC system because they maintain air pressure and filter out waste.

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Ganesh Reddy Bodigam
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Helpfull for all beginners and HVAC engineers..

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Wajed
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excellent course

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Parvez Ahmed Purzgar
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It's a perfect course for those who wish to have a good understanding about the HVAC and its different systems. Simply explained, well presented and good course material. I am enjoying it.

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muhammad abu sufyan
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great

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Manthan Patil
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GOOD ONE FOR FRESHERS

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Pallavi ghodeswar
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Best learning app

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Rakshith B
5

Sir it would be a great help if you provide us the necessary resources like ISHRAE Handbook etc. Thank you.

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Alisha Sharikmaslat
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Just want to say....Thank you soo much

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Vinayak Rai
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HAP software,Uski official website se, INDIA region ka trial nahi mil pa raha hai........kya karen?

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MD Meraj
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Thank you so much sir

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Course Content

  1. Introduction to HVAC
    6m 3s
  2. Fundamental of Thermodynamics
    3m 6s
  3. Properties of a System
    11m 14s
  4. Pure Substance in Thermodynamics Laws of Thermodynamics
    12m 13s
  5. Fundamental of Heat Transfer
    8m 24s
  6. Overview of HVAC Systems
    10m 54s
  7. VCR Cycle
    11m 12s
  8. Fundamentals of RAC
    11m 51s
  9. Refrigerants in HVAC
    14m 31s
  10. Assignment : Fundamental of Thermodynamics
    3m 6s

  1. Fundamental of Psychrometry
    21m 38s
  2. Psychrometric Process
    8m 34s
  3. Assignment : Psychometry
    2m 20s

  1. Classification of AC
    20m 54s
  2. Non Centralized AC (Windows & Split) Centralized AC
    15m 47s
  3. Air Handling Unit (AHU)
    10m 11s
  4. Chiller Water System
    20m 46s
  5. Package System, VRV & VRF System
    14m 13s
  6. Assignment : Classification of AC
    3m 46s

  1. Introduction to Heat Load
    34m 9s
  2. Heat Load Calculation for Bedroom
    01h 12m 33s
  3. Heat Load Calculation for Hostel
    01h 4m 37s
  4. Heat Load Calculation for Dinning
    18m 18s
  5. Introduction to HAP - Hourly Analysis Program
    28m 5s
  6. Head Load Calculation on HAP
    38m 42s
  7. Assignment : Heat Load
    5m 46s

  1. Introduction About Ducting
    27m
  2. Duct Fittings - part 1
    24m 33s
  3. Duct Fittings - part 2
    13m 18s
  4. Duct Annotation
    29m 11s
  5. Single Line Diagram (SLD)
    11m 22s
  6. Level-1 Double Line Diagram (DLD)
    17m 38s
  7. Level-2 Double Line Diagram (DLD)
    17m 30s
  8. Duct Design Accessories and Connection Pipes
    31m 56s
  9. Section View and Duct Size Reducer
    43m 54s
  10. Return Duct Design
    41m 16s
  11. Creating Plenum Box-Creation and Size
    35m 45s
  12. Total Static Pressure Loss Using Software
    25m 44s
  13. ISP & Blower Selection
    15m 21s
  14. Assignment : Air Distribution
    3m 57s

  1. Introduction to Hydronic System
    10m 51s
  2. Pipe Design, Fittings and FCUs
    37m 43s
  3. Types of Valves
    15m 42s
  4. Drainage Pipes
    8m 5s
  5. Pipe Loss Calculation and Pump Selection
    10m 18s
  6. Assignment : Hydronic System
    3m 39s

  1. Ventilation
    29m 46s
  2. Fresh Air Calculation
    14m 3s
  3. Clean Room
    20m 6s
  4. Assignment : Clean Room
    2m 5s
  5. Assignment : Fresh Air
    2m 17s
  6. Assignment : Ventilation
    2m 23s

  1. Industry Level Project in HVAC
    01h 2m 24s
  2. HVAC Equipment
    17m 43s

  1. Course Summary
    4m 7s

  1. Interview Questions in HVAC
    21m 43s

  1. Career Guideline
    2m 12s
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