The duct fans in this category feature circular duct connections and are available as non insulated and insulated versions. They have impellers with backward or forward curved blades.
Airflows up to 18,000 m³/h (5.0 m³/s).
This category comprises the following product groups: CK, LPKB, LPKB Silent, RKC, BFC, IRB, IRE and IFK.