Design features
Wolter air-extract boxes are used to extract more heavily polluted air, for example from professional kitchens. A well-insulated housing keeps the noise level to a minimum. The impeller is driven by a standard flange-type motor, single or 3-phase supply, mounted outside of the airstream. Motors suitable for speed control are available. Impeller and motor are mounted on a swivel door. The impeller is easily dismounted for cleaning. The permissible temperature range of the conveyed medium is -30°C to +120°C.
Motors
All fans are equipped with standard flange type IEC-motors. Protection class IP54, isolation class B. Up to motor size 100, voltage-controllable motors can be supplied
Impeller
Wolter air-extract boxes are fitted with either forward-curved or backwardcurved impellers. Forward-curved impellers are manufactured of galvanised sheet metal, backward-inclined impellers are made of aluminium. The design of both impeller types guarantees high efficiency and minimal noise emissions.
- KAT. - forward-curved impeller with scroll
- KAF. - backward-curved impeller without scroll
Casing
Wolter air-extract boxes have a torsion-resistant aluminium frame, joined by solid plastic corners. All side plates are made of galvanised sheet metal insulated with noise-absorbing mineral wool. The aerodynamically shaped scroll (KAT) guarantees high efficiency. KAF type fans are fitted with a plug fan impeller without scroll. The fan inlet and outlet can easily be connected to standard air ducts. Special connection clamps (RSV) are available.
