American Heat Treat Furnaces (AHTF) Corp. offers air-cooled replacement fans using its patented heat-blocking technology for IGE PW-30, PW-35 and PW-40 water-cooled plug fans. Both roof type and side-wall fans are available. The fans fit into the same location and provide sufficient pressures and flows well within tolerance for heat treat applications using existing motors or AHTF motors. Greasing schedules remain unchanged. Radial (paddle) and axial (pitched) style blade elements are available.