RFC and RFE centrifugal fans are one-sided intake fans driven by flange electric motors. They are designed for air exchange in civil construction, industrial premises and agriculture. (e.g. granaries). RFC fans are low-pressure fans (with forward-curved impeller blades), and RFE fans are medium-pressure (backward-curved impeller blades). Centrifugal fans are available in several types, versions and sizes with impeller diameters ranging from 200 mm to 630 mm.