HIGH TEMPERATURE CENTRIFUGAL FANS

High temperature forward curved multiblade fans

Forward Curved Multiblade fans, also referred to as “Squirrel Cage” fans, are usually specified for large flow volumes against low to medium static pressures. There are other multiblade styles, including backward inclined, but IGE typically recommends forward curved blades as they deliver the same volume of air, at reduced RPM, compared to other styles & configurations. The reduced RPM is important as this yields lower stresses in the wheel allowing higher temperatures to be used for the air volume specified.

IGE’s high temperature forward curved multiblade fans have been developed and refined over more than a century. They are suitable for continuous heavy-duty applications at temperatures up to 1780°F (970°C) and are offered in various configurations including insulated housing fans and cartridges. IGE offers standard designs from 100 CFM to >250,000 CFM with typical static pressures up to 16” w.c. and specialty designs that can deliver higher pressures if desired. 

High temperature radial blade fans

Radial Blade fans, also known as paddle wheel fans, are usually specified for medium flow volumes against medium to high static pressures, especially in applications with material or dust in the airstream. Due to its rugged construction and structural integrity, it is suitable for continuous heavy duty applications involving temperatures up to 2200°F (1200°C). IGE offers standard designs from 100 CFM to 45,000 CFM with 20” w.c. static pressure on standard units and specialized construction to deliver up to 34” w.c. static pressure.

Since introducing the industry standard PW-35, the king of carburizing, in the 1950s, IGE has continually refined its designs, setting new standards for reliability and shaft sealing, and introducing reversible designs.

IGE’s radial blade fans are commonly used in the commercial heat treating, steel, and automotive & commercial transportation industries. Common applications include carburizing, nitriding, and tempering.

High temperature backward inclined fans

Backward Inclined or “BI” fans are usually specified for medium flow volumes against low to medium static pressures. The wheel’s blades are flat and lean away from the direction of the wheel’s rotation. To move a given amount of air the backward inclined fan is of a non-overloading design and is suitable for systems with fluctuating system resistance. This type of fan runs at a relatively high speed and is more efficient than the forward curved multiblade or radial blade fan. The higher operating speed comes with maximum temperature tradeoffs: IGE only recommends backward inclined wheels for operation up to 1350°F (730°C). For higher temperature operation, please see forward curved multiblade fans or radial blade fans.

IGE offers backward inclined fan units from 850 CFM to 45,280 CFM with pressures up to 8” w.c. with standard construction. Higher pressures are available with specialty construction. IGE’s backward incline fan units are available in three temperature ratings.