Direct Drive Air Handling Units with neat and compact design. Access can be on the left or right hand side (to be specified at time of ordering).

Mini Direct Drive Unit - Duties from 0.05m³/s to 2.25m³/s
A compact and economical range of units with directly driven centrifugal fans. There are six standard unit sizes. All the fans are speed controllable for added flexibility and incorporate Standard Thermal Overload Protection (S.T.O.P.). The standard unit consists of a rigid inlet connector, 100mm EU4 panel filter, l.p.h.w. or electric heater, direct drive centrifugal fan and rigid outlet connector. An optional Bag Filter (EU5) is available or Panel (50mm) and Bag arrangement.

Suitable for internal mounting as standard, models suitable for external mounting with optional roof canopy, inlet weather cowl and plastic coated panels (colour BS10A05) is available to order.

Specification
Direct Drive Fans have forward curved centrifugal impellers factory matched to an external rotor motor and statically and dynamically balanced to ISO 1940 as a complete assembly. The external rotor motors have sealed for life ball bearings. They incorporate Standard Thermal Overload Protection (S.T.O.P.) and are fully speed controllable. Insulation is class B and the enclosure IP44 to DIN 40050 with the electrical design corresponding to DIN IEC 38. Motors are suitable for ambient temperatures of up to 40°C and atmospheres up to 95% R.H.

Flexible Connectors
The Flexible Connectors are manufactured from Revertex JPT 20 with ductmate flanges to DW142.

LPHW Heater Batteries
L.P.H.W. Heater Batteries are constructed from copper tube, mechanically bonded to aluminium fins with the complete assembly housed in a galvanised steel casing. The coil headers and return bends are totally enclosed within the air handling unit casing. Flow and return connections are located on the same side of the unit and have male B.S.P. thread. L.P.H.W. Heater Batteries are pressure tested under water to 250p.s.i.

Electric Heater Batteries
Electric Heater Battery elements are constructed from Nichrome 5 spiral resistance wire surrounded by magnesium oxide powder and sheathed in stainless steel. The elements are carried on a galvanised steel frame. All electric heaters incorporate a thermal cut out device. Electrical connections are via a flush mounted terminal box on the outside of the air handling unit casing.