Duct Sizing: Area = CFM ÷ FPM, Round Diameter & Velocity Check
This lesson is part of the course
In this lesson
You size six duct runs from airflow and design velocity: required area in square inches, round diameter, the next standard size and the actual velocity in the chosen duct.
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Lessons in this course
- HVAC Units: BTU/h, Tons, kW and °F/°C (incl. ΔT) Locked
- Conduction Heat Loss: U × A × ΔT for Walls, Windows, Doors & Ceiling Locked
- Infiltration & Ventilation Load: CFM × 1.08 × ΔT and the Latent 0.68 Factor Locked
- Room-by-Room Load Summary, BTU per ft² & Equipment Size in Tons Locked
- Airflow: 400 CFM per Ton, Room CFM by Load Share & Register Count (Chart) Locked
- Duct Sizing: Area = CFM ÷ FPM, Round Diameter & Velocity Check Locked
- Superheat & Subcooling: Readings vs Targets for TXV and Piston Systems Locked
- Efficiency & Operating Cost: SEER, EER, COP and Annual Savings (Chart) Locked