FRP Fans for Corrosive Air Handling IPF fiberglass fans conform to SPI, ASTM C582 and ASTM 4167-82 standards. The housings are manufactured from premium grade, fire retardant resins that provide excellent corrosion resistance in most chemical environments. IPF Impellers are made of a premium vinylester that combines corrosion resistance with structural integrity under the stresses of rotation. Centrifugal Axial and Roof