cirrus
0.1 - 1 m³/s
Lead Time 1 Working Week
Performance Up to 1.0m3/sec
Low Weight tick
weatherproofing Optional

Casing

Construction

 Single Skin N/A
Single Skin N/A
Double Skin tick
Low Cost tick
Speed Controllable tick
Control Panels tick
Nevada Cirus1 Nevada Cirus2 Nevada Cirus3

The CIRRUS range of air handling units are principally designed for internal mounting arrangements where space is at a premium, such as ceiling voids, refurbishment projects or where there is limited headroom. The slim profile of the CIRRUS units means they are perfect where top or bottom access is required. With six standard model sizes and a duty range of up to 1.0 m3/sec, the CIRRUS range is designed to suit most typical applications in the building services sector. Each unit is constructed from 'Pentapost' framework, comprising an aluminium frame and purpose built corners, for strength and style, with double skinned panels that provide a rigid construction for the unit's internal components. Standard CIRRUS air handling unit components comprise either single or twin direct drive forward curved centrifugal fans, a pleated panel filter and L.P.H.W. Coil or Electric Heater battery dependant upon model selection.


  • Low profile of unit is ideal for ceiling mounting,where space is at a premium, with top or bottomaccess to facilitate easy fan and filter maintenance.
  • Excellent performance characteristics with air volumes of up to 1.0 m3/sec.
  • Rigid aluminium framework with purpose built corners for strength and style.
  • Standard components include forward curved single inlet fans, electric or hot water heaters and panel filters, with a comprehensive range of accessories.
  • Slide rails allow installation and regular maintenance of standard components with minimal effort.
  • A cost effective, fast build alternative to welded steel frame air handling units. Fan, filter and heater all within one casing, therefore easier to install.
  • A flexible modular construction which provides an easier on site build option.
  • Double skinned panels with smooth, clean lined outer skins to create an attractive, quality appearance and finish.
  • A framing structure which enables versatility in design by providing hanging, stacking or joining configurations.
  • Units are acoustically and thermally lined.
  • A wide range of heater outputs are available.
  • Matching silencers are available to fit onto the inlet or outlet of the unit via a spacer section.
General

The Cirrus range of Air Handling units are for internal mounting arrangements. Access, to be specified at the time of ordering, can be from above or below the unit, with hinged access panels optional if required. Although units have galvanised casings as standard, they can be supplied with plastisol coated steel outer skins upon request. Panels are flush mounted into the unit framework rebates on a crush resistant closed cell neoprene sealing gasket, which provides an air seal between the panel and the component section. Gaskets are chemically and biologically inert and meet all requirements of DW 144.

Internal Units

The CIRRUS Direct Drive Air Handling units have an AA25 anodised finish extruded aluminium section, constructed from a 30mm framework with a wall thickness of 1.5mm. The mullion section is used between access panels and where panels are joined as part of the pentapost framework. The mullion is constructed from an AA25 Anodised finish extruded aluminium section, with a wall thickness of 1.5mm The specially designed durable corner sections for the 30mm framework are manufactured from black high density glass reinforced nylon, providing a framework of strength and rigidity, onto which all internal

The fans are mounted onto a diaphragm plate, are double inlet double width or single inlet single width forward curved centrifugal, housed in a purpose designed scroll with integral deep drawn inlet cones to facilitate maximum efficiency. All fans are suitable for either 230V/1Ph/50Hz or for 400V/3Ph/50Hz electrical supply. The fans are suitable for operating temperatures of up to +40°C. The motors are isolated from the unit case and have anti-vibration mounts fitted between the motor mounting arm and the fan casing. All wheels are dynamically balanced.

Pleated Panel filters are 100mm deep disposable type to Grade G4, in accordance with BS EN 779 1993 (EU4) and have a maximum operating temperature of 100 °C. They are for side, top or bottom withdrawal, mounted into the unit on slide rails, which are manufactured from pre-galvanised sheet steel to enable filter replacement.

Pleated Panel filters are manufactured from pleated media which consists of reinforced non-woven fibres, with expanded diamond grid to provide maximum support. Pleating the media effectively increases the filtration area to more than three times that of the face area, providing high dust holding capacity and low pressure loss. The pleat pack is encased in a water resistant lattice cardboard frame.

Hot Water Heating Coils (L.P.H.W.)

Coils are constructed from seamless drawn copper tube to BS 2871 mechanically expanded into aluminium fins with die formed self spacing collars. The coil casing is formed from heavy gauge galvanised sheet to BS 2989 to make a rigid assembly, with BSP(M) pipe fittings on coil flow and return connections. Tube end plates have die formed collared holes to allow expansion and contraction of the tubes without damage. All coils are subjected to an air under water test to 16 bar during manufacture. All coil sections are fitted into the units on pre-galvanised steel slide rails for ease of assembly and withdrawal.

(E.H.B)

Elements are constructed from Nichrome 5 spiral resistance wire surrounded by magnesium oxide powder and sheathed in stainless steel. The elements are mounted on a galvanized sheet steel terminal housing. All electric heaters are fitted with high temperature thermal cut out protection for wiring into the control circuit and are generally available in the power and number of steps required. A control system must be provided to ensure the heater is not activated when there is no airflow and the fan runs on after the heater has been switched off, to dissipate any residual heat. It is recommended that a fan run on timer be incorporated within the controls to prevent possible heat damage, as well as an airflow switch.