How to Choose a High Temperature Air Duct

Start with continuous and peak temperature

Continuous operating temperature is more important than the highest number printed in a catalog. Record normal airflow temperature, peak temperature, peak duration and any radiant heat near the duct. A short hot-air peak and constant contact with a hot metal surface are different design conditions.

Define the conveyed medium

Clean air, exhaust gas, oil mist, powder and abrasive particles require different wall materials. Silicone fiberglass is widely used for hot air, while polyurethane is generally better for abrasive solids and metal ducting may be required for extreme heat or corrosive exhaust.

Check pressure and movement

Provide positive pressure, vacuum level, bend radius and movement frequency. A lightweight ventilation hose may collapse under suction, while an unnecessarily heavy hose can increase installation stress.

Specify connections and safety margin

Confirm inside diameter, length, end cuffs, clamps and grounding requirements. Select a construction with a reasonable temperature and pressure margin, then validate it in the actual system before full production.