Wolter · 2 series
Cabinet fans
A cabinet fan is a centrifugal fan in an insulated casing that fits into the ductwork. It serves supply and extract ventilation and can replace a simple air handling unit.
Wolter builds two cabinet fan series:
- KB — sizes 500–1250, with a double-inlet centrifugal fan, belt-driven (TRZ or HRZ) or direct-driven (DRS and others). Approx. up to 50,000 m³/h.
- KBPF — sizes 450–710, with a direct-driven plug fan and voltage speed control. Approx. up to 10,000 m³/h.
The casings use extruded aluminium profiles and galvanised insulated panels. The side panels are interchangeable; on KBPF swapping panels selects a straight or 90° outlet.
Series
Wolter cabinet fan series
KB — belt- or direct-driven cabinet fans
Insulated cabinet 500–1250 with a double-inlet centrifugal fan: belt-driven TRZ/HRZ or direct-driven DRS.
KBPF — plug-fan cabinet fans
Insulated cabinet 450–710 with a direct-driven plug fan: straight or 90° outlet, voltage speed control.
Series comparison
Typical uses
Cabinet fans serve supply and extract systems in public buildings, where the fan sits close to occupied rooms and noise must be minimal — hotels, offices and healthcare buildings. For car-park extract by two independent fans Wolter makes the dedicated GAB / GAPF units.
Casing options
- epoxy-coated panels on request;
- access door as an option (KB);
- weatherproof version for outdoor installation (KB).
KB or KBPF
KB covers higher airflow — approx. up to 50,000 m³/h — with double-inlet belt- or direct-driven fans. KBPF, with a direct-driven plug fan, is more compact and has no belt drive, approx. up to 10,000 m³/h.
Applications
Where they are used
FAQ
Frequently asked questions
How does a cabinet fan differ from an air handling unit?
A cabinet fan is a fan in an insulated casing; filters, heaters and dampers are selected separately and installed in the duct. The manufacturer lists replacing an air handling unit as one of the uses of KB.
Can a cabinet fan be installed outdoors?
Yes, KB is available in a weatherproof version.
Which fan is inside a KB?
A double-inlet centrifugal fan, belt-driven — TRZ (forward-curved) or HRZ (backward-curved) — or a direct-driven DRS, DRAE or DRAD fan.
Need equipment selection or a system design?
Send us the layouts or the brief — we will prepare a selection, a calculation and a quotation.