No.3 Patricia Atswei Link, East Legon
Efficiency: Reduces energy consumption and costs
Comfort: Ensures even air distribution and consistent temperature
System Health: Minimizes wear and tear, extending equipment lifespan
Undersized ducts lead to noise, inefficiency, and strain on components
Oversized ducts cause poor airflow and temperature imbalances
Both result in higher utility bills and reduced comfort
Vary by building layout and system needs
Two main types: circular ducts and rectangular ducts
Based on Velocity
Formula: Area = Flow Rate / Velocity
Example: For 0.029 m³/s airflow at 4 m/s → Area = 0.00725 m² → Diameter ≈ 96 mm
Based on Pressure Drop
Formula:
PD = f * (L/D) * 0.5 * density * velocity²
Example: A 100mm duct = 2.5 Pa/m drop → too high. Use 150mm for ≤ 1 Pa/m.
Follow ASHRAE standards or DW144
Use a ductulator or HVAC software like h2x Engineering
For efficient HVAC design, always check both airflow and pressure drop. Tools like h2x make it easier to ensure system performance and code compliance.
Need support with duct sizing or a full HVAC system design? Contact our team at Kawayeski Cooling – Ghana’s trusted HVAC partner.
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