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Choosing the Right Diameter and Insulation Thickness for Your Ventilation Project

May 19, 2026

Choosing the Right Diameter and Insulation Thickness for Your Ventilation Project

Not all flexible ducts are created equal. From small residential range hoods to large industrial HVAC systems, selecting the correct diameter and insulation thickness can optimize both performance and cost. Here's how our insulated flexible duct range compares across different applications.

Diameter Range: From 80mm to 610mm (3″ to 24″)
Diameter Range Typical Application Airflow Capacity
80 – 150mm (3″ – 6″) Residential range hoods, bathroom exhaust, small venting Low to medium
160 – 300mm (6″ – 12″) Commercial HVAC, office ventilation, restaurant exhaust Medium
310 – 610mm (12″ – 24″) Industrial air conditioning, factory ventilation, large-scale air movement High (up to 30 m/s)
Insulation Thickness: 25mm vs. 50mm
Thickness Thermal Performance Best For
25mm Standard insulation Mild climates, short duct runs, budget-conscious projects
50mm Enhanced insulation Extreme temperatures (-30°C to +250°C), long runs, high humidity areas
Density Comparison: 16 kg/m³ vs. 32 kg/m³
Density Strength & Durability Sound Absorption
16 kg/m³ Lightweight, more flexible Basic
32 kg/m³ Higher structural strength, more durable Enhanced
Application Quick Selection Guide
Application Recommended Diameter Insulation Thickness Density
Range hood exhaust 80–150mm 25mm 16 kg/m³
Residential A/C 160–250mm 25mm 16 kg/m³
Commercial HVAC 250–400mm 50mm 24–32 kg/m³
Industrial ventilation 400–610mm 50mm 32 kg/m³
Noise-sensitive areas Any (with acoustic core) 50mm 32 kg/m³

Selection Tip: For condensation prevention in high-humidity environments, 50mm insulation is recommended.

Temperature & Pressure – One Standard for All

Regardless of diameter or thickness, all our ducts maintain:

  • Temperature range: -30°C to +250°C

  • Max air velocity: 30 m/s

  • Working pressure: 2500–3000 Pa

Why Our Ducts Stand Out

  • Flame retardant aluminium construction

  • Flexible design for easy installation

  • Full diameter retention through bends (low airflow resistance)

  • Custom lengths: 5–10 meters per piece (cut to length as needed)

Final Recommendation

“Measure your duct run, calculate your airflow requirements, and consider your thermal environment. For most standard HVAC applications, a 250mm diameter with 25mm insulation is a safe starting point. For extreme temperatures or acoustic requirements, upgrade to 50mm insulation or the acoustic perforated core version."

Need help selecting the right duct for your project? Contact us for free samples and technical support.