High Temperature Fan Material Selection Guide

High Temperature Fan Applications

High temperature fans are used in processes where exhaust gases exceed standard operating temperatures. Common applications include:

• Dryer exhaust systems (80-150°C)
• Incinerator exhaust (up to 400°C)
• Boiler induced draft fans (up to 350°C)
• Kiln exhaust systems (up to 600°C)

Material Selection by Temperature Range

80-150°C Range

Standard carbon steel (Q235B) is adequate for this range. Use galvanized steel if corrosion is also a concern.

150-300°C Range

At temperatures above 150°C, standard steel begins to lose strength. Recommended materials:

• 16Mn (low-alloy steel): Up to 300°C
• 0Cr18Ni9 (304 stainless steel): Up to 800°C
• 1Cr18Ni9Ti (321 stainless steel): Up to 900°C

Above 300°C

For extreme temperature applications:

• Heat-resistant cast steel for fan housing
• Inconel alloy for blade surfaces above 600°C
• Ceramic fiber insulation on external surfaces

Critical Design Considerations

1. Thermal expansion: Allow adequate clearance between rotating and stationary parts. Design expansion joints in ductwork.
2. Bearing protection: Keep bearings outside the hot gas stream using shaft-mounted cooling fans or water-cooled bearing housings.
3. Blade coating: Apply ceramic thermal barrier coating on blades to extend material life at extreme temperatures.