Duct sizing is technique which is used to by engineers to make airflow good in the building. they obtains good airflow using multiple techniques one of the most common technique is using software , Duct Sizer and other tools. they Use their duct info to make design on the sites like Daikin, McQuay etc. this is very important all over the world and still its very popular because poorly sized ducts can cause lot of problems like pressure loss, noise issues and all.
What is McQuay Duct Sizer?
McQuay Duct Sizer is technique which is used to by peoples to size ducts it is free and compact tool they use it to help HVAC peoples to size air ducts using multiple methods one of the most common method is Equal Friction and Equal Velocity method they obtain results using windows application it supports metric and imperial units and work for rectangular and round duct systems
Key Features of McQuay Duct Sizer
✅ Support for multiple duct shapes: round and rectangular
✅ Unit flexibility: Metric and Imperial
✅ Calculation methods: Equal Friction or Equal Velocity
✅ Friction loss calculation and airflow optimization
✅ Portable software: Works without the need for installation
✅ Export data to Excel for further analysis
Duct Sizing Methods Explained
Equal Friction Method:
This method maintains a constant friction loss per unit length across the entire duct system. It is simple, commonly used, and helps maintain balanced airflow throughout.
Equal Velocity Method:
In this method, the air velocity is kept constant across all duct branches. This ensures uniform velocity and is particularly helpful in noise-sensitive applications.
How McQuay Duct Sizer Works
Once you open the software, you can:
* Choose your unit system (Metric/Imperial)
* Select the duct type (Round or Rectangular)
* Enter the desired airflow rate (CFM or LPS)
* Choose the method: Equal Friction or Equal Velocity
* The tool will automatically calculate:
* For Rectangular: Width and Height
* For Round: Diameter
* Friction loss
* Air velocity
These outputs help in designing systems that are balanced and code-compliant.
Advantages of Using McQuay Duct Sizer
1. Time-Saving: No need for manual duct calculation or ASHRAE tables.
2. Portable: Lightweight application that runs without installation.
3. Reliable: Developed by McQuay (now Daikin), a global HVAC brand.
4. Cost-Effective: Available for free with full functionality.
5. Useful for On-Site Engineers: Can be used quickly for troubleshooting or redesign on the go.
Why Duct Sizing is So Important in HVAC
Proper duct sizing impacts:
* Airflow distribution
* Noise levels
* System pressure balance
* Energy efficiency
* Comfort and air quality
Undersized ducts cause increased static pressure and noise, while oversized ducts waste material and reduce velocity, leading to poor ventilation.
Download McQuay Duct Sizer (Free)
The current free version available is Version 6.4. You can download it from:
🔗 Official Source : daikinapplied.com , daikinapplied.com
Note: Always scan downloaded software using antivirus and ensure it comes from a trusted source.
Other HVAC Duct Sizing Tools You May Like
* Ductulator by Trane
* Elite Ductsize
* ASHRAE Duct Design Charts (Manual D)
* CoolCalc (Online duct design tool)
Tips for Best Use
* Use accurate airflow values based on Manual J load calculations
* Combine the tool with ASHRAE standards to ensure code compliance
* Export results to Excel and maintain a record for future design audits
* Always cross-check noise levels and pressure drops in long duct runs
McQuay Duct Sizer remains one of the best free tools for air duct design and sizing. Whether you’re a consultant, student, or HVAC contractor, it can simplify the process and improve your system efficiency.
