Categories: Nuaire

nuaire AVT-NC Indoor Use Twin Fans with No Control Installation Guide

nuaire AVT-NC Indoor Use Twin Fans with No Control Installation Guide


  • The provision of the electrical supply and the connection of the unit to the mains must be carried out by a qualified electrician.
  • Isolate from power supply before removing any covers. During installation /maintenance ensure all covers are fitted before switching on the mains supply.
  • All-pole disconnection from the mains as shown in the wiring diagram must be incorporated within the fixed wiring and shall have a minimum contact separation of 3mm in accordance with latest edition of the wiring regulations.
  • This unit must be earthed.
  • Ducting must be securely fixed with screws to the spigot to prevent access to live parts. Duct runs terminating close to the fan must be adequately protected by suitable guards.
  • Precautions must be taken to avoid the back-flow of gases into the room from the open flue of gas or other fuel-burning appliances.
  • This appliance should not be used by children or persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge, unless they have been given supervision or instruction concerning the safe use of the appliance by a person responsible for their safety.
    Children shall not play with the appliance. Cleaning and user maintenance shall not be carried out by children.

Signifies a general warning regarding hazard specified by supplementary information.

This unit must be completely electrically isolated before any panels are removed. Check mains supply and control connections.

This unit contains fast moving rotational parts which may start automatically. It is the sole responsibility of the installer to adequately guard these components.

Read and understand the installation and maintenance manual before installing, operating or maintaining this product.

Important Information

This manual contains important information on the safe and appropriate assembly, transport, commissioning, operation, maintenance, disassembly and simple troubleshooting of the product.

While the product has been manufactured according to the accepted rules of current technology, there is still a danger of personal injury or damage to equipment if the following general safety instructions and the warnings contained in these instructions are not complied with.

  • Read these instructions completely and thoroughly before working with the product.
  • Keep these instructions in a location where they are accessible to all users at all times.
  • Always include the operating instructions when you pass the product on to third parties.
Personal Protective Equipment

The following minimum Personal Protective Equipment (PPE) is recommended when interacting with Nuaire product:

  • Protective Steel Toed Shoes – when handling heavy objects.
  • Full Finger Gloves (Marigold PU800 or equivalent) – when handling sheet metal components.
  • Semi Fingerless Gloves (Marigold PU3000 3DO or equivalent) – when conducting light work on the unit requiring tactile dexterity.
  • Safety Glasses – when conducting any cleaning/cutting operation or exchanging filters.
  • Reusable Half Mask Respirators – when replacing filters which have been in contact with normal room or environmental air.

Nuaire would always recommend a site specific risk assessment by a competent person to determine if any additional PPE is required.


Units are rectangular in section and have circular rigid spigots at each end. Four matching mounting feet are supplied with the unit. The unit shall be double skinned with 35mm infill panels and shall be manufactured from heavy gauge, corrosion resistant Aluzinc steel, internally lined with acoustic material. Fully detachable panels for maintenance/service and manometer test points. The fan should be with an ‘inline assembly’, positioned in series for optimum performance.

Units 1 – 6 incorporate a full size access panel fitted to the bottom face which is fully detachable for inspection purposes. The underside access panel can be slid in either direction with-out removal, if required (Section 4.7.1).

Units 7 – 9 incorporate a split access panel fitted to the bottom face which is fully detachable for inspection purposes. Each split access panel can be moved and opened individually and slid in either direction without removal, if required (Section 4.7.2).

Code Description
  1. Range: AV = Aire-Volve
  2. Fan Type: T = Twin Fan
  3. Unit Size: 1, 2, 3, 4, 4L, 5, 6, 7, 8, 9
  4. Control Type: NC = No Control
    1 2 3 4
    AV T 1 NC


Upon receipt of the equipment, an inspection should be made. Before commencement of lifting, ensure that normal equipment safety checks have been carried out.

A unit / module should be removed from the vehicle using a fork lift or crane. Always handle with care to avoid damage and distortion, and where lifting slings are employed use spreaders to ensure slings do not come into contact with the unit case, or control pack. Correctly position slings to avoid twisting of the unit case and observe the centre of gravity before the final lift is made. The weight of the unit is available on the unit rating plate.

Dependent on model and size, units may be supplied in single or multimodular sections. Handle each section individually do not stack for lifting or storage.


Installation must be completed by competent persons, in accordance with good industry practice and should conform to all governing and statutory bodies i.e. IEE, CIBSE, etc.

The units are supplied for installation into In-line ductwork (internal) applications only. All ductwork connections must be airtight to prevent loss of performance.

The unit has an external case side mounted control module / terminal box and is supplied ready for connection into the electrical supply. The control is mounted on the side of the unit as standard but its position can be changed to the other side of the unit if required, fixings by others (Section 4.8).

The method of mounting used is the responsibility of the installer.
The units can be mounted in any of the below attitudes enabling alternative control positions.

Once assembled, units should always be positioned with sufficient free space adjacent to the unit to allow for access panel(s) to extend forward for future inspection, maintenance, component service, repair and replacement. The access panel(s) require opening clearance to operate.

Surface Mounted Units

Utilising four matching anti-vibration (AV) mounting feet (Figure 1). AV mounts isolate the fan only, silencers / back draught dampers and other “significant mass” accessories should form part of the fixed ductwork after the flexible connection.

Units Suspended With Drop Rods

From the ceiling or in the ceiling void using four AV mounting feet supplied, with access panel positioned for underside access (Figure 2 & 3).

Vertically Wall Mounted Units

Utilising the Aire-Volve Vertical Hanging Bracket kit that includes wall hanging brackets and hinges (Figures 4 and 5). The unit case has captive M8 nuts which can be used after removing the M8 ‘plugging’ screws.
Units should always be positioned with sufficient space to allow the access panel to extend forward. Only suitable for units mounted indoors.

Aire-Volve Unit Size Aire-Volve Vertical Hanging Bracket Kit

Anti-Vibration (AV) Mounts

AV mounts should not be fitted to a fan/silencer assembly unless there are flexible connectors fitted between the assembly and associated duct work. AV mounts should be installed with the matched mounting feet and positioned such that they carry an equal proportion of the assembly weight. This is particularly important where fans and silencers are installed on suspension rods. Suspension rods and fixing screws are not supplied.

Resilient rubber anti-vibration mounting kits (NAV) are available, the correct selection and type employed will depend on the accurate calculation of the weight of the assembly to be supported.

The large round washers included with the NAV(2-5) are for fitting above or below the resilient mounting as required to safeguard the installation against break-up of, or damage to, a mounting. In the event of a resilient mounting failure, the washer will support the weight of the unit. Fans using size NAV 6 upwards require supporting steelwork to be designed (by others) for suspended applications.

AV mounts must only be subjected to compressional forces and MUST NOT be used in a configuration that places these parts under tension or shear force.

Anti-Vibration Mounting Kit A (mm) B (mm) Max. Supporting Weight (kg)
NAV2 40 75 80
NAV3 40 75 180
NAV4 40 75 260
NAV5 40 75 130

Dimensions (mm) & Weights (kg)

AVT Units

Unit Code A A1 (Bracket Centre Points) B B1 (Bracket Centre Points) C D X Weight (kg)
AVT1 931 701 544 576 250 200 430 46
AVT2 968 738 544 576 285 200 430 48
AVT3 1186 955 681 713 334 250 555 67
AVT4 1229 999 681 713 376 315 655 68
AVT4L 1531 1262 827 860 401 315 880 99
AVT5 1531 1301 827 860 433 315 880 102
AVT6 1729 1504 921 953 545 400 830 153
AVT7 1892 1666 1019 1050 575 400 655 179
AVT8 2238 2007 1244 1275 615 500 635 267
AVT9 2238 2007 1244 1275 615 500 635 244

Matched AVT Silencers

Matched silencers with double walled Aluzinc construction and 35mm infill acoustic lining provides the best acoustic solution.
Easy fit matching silencers with simple integral brackets can be easily incorporated into existing drop rod systems helping to reduce install time on site.

Unit Code Silencer Code Size A B C Weight (kg)
AVT1 AVT1-MSM Mini 500 544 260 27
AVT1-MSS Standard 1000 544 260 32
AVT1-MSL Large 1500 544 260 45
AVT2 AVT2-MSM Mini 500 544 286 27
AVT2-MSS Standard 1000 544 286 32
AVT2-MSL Large 1500 544 286 45
AVT3 AVT3-MSM Mini 500 681 332 30
AVT3-MSS Standard 1000 681 332 39
AVT3-MSL Large 1500 681 332 56
AVT4 AVT4-MSM Mini 500 681 374 34
AVT4-MSS Standard 1000 681 374 39
AVT4-MSL Large 1500 681 374 56
AVT4L AVT4L-MSM Mini 500 827 401 34
AVT4L-MSS Standard 1000 827 401 42
AVT4L-MSL Large 1500 827 401 61
AVT5 AVT5-MSM Mini 500 827 781 43
AVT5-MSS Standard 1000 827 781 44
AVT5-MSL Large 1500 827 781 65
AVT6 AVT6-MSM Mini 500 921 552 43
AVT6-MSS Standard 1000 921 552 65
AVT6-MSL Large 1500 921 552 89
AVT7 AVT7-MSM Mini 500 1019 653 43
AVT7-MSS Standard 1000 1019 653 71
AVT7-MSL Large 1500 1019 653 98
AVT8 AVT8-MSM Mini 500 1244 753 51
AVT8-MSS Standard 1000 1244 753 83
AVT8-MSL Large 1500 1244 753 114
AVT9 AVT9-MSM Mini 500 1244 774 92
AVT9-MSS Standard 1000 1244 774 116
AVT9-MSL Large 1500 1244 774 125
Silencer Installation

To change orientation of attenuator pod just turn silencer over before fitting. Use fixing brackets as shown below. Ensure that the attenuator pods are in the correct orientation as shown in Figure 16.

All Unit Sizes Except AVT4L

Remove spigot panels from each end of the main unit and relocate them to the open silencer ends. The coupling system located on the sides of the silencers and AVT unit simply clips together with additional alignment bolts (ensure alignment bolts are correctly located).

AVT4L Units Only

Ensure fixing brackets halves are correctly aligned and assemble using M8 Cap head bolt and nut supplied with bracket. Once located, tighten bolts ensuring seal between silencer and seal is achieved.

Unit Access

AVT 1-6 Access

  1. Release 6 base fixings, 3 each end of each access panel (note captive fixings).
  2. Release 6 lower end panel fixings, 3 each end of the unit.
  3. Lower the extrusion containing the access panel (on each side of the unit) so the 3 extrusion fixings move to the top of the 3 ‘L’ cut-out shapes in the sides of the extrusions. When completed the extrusions / access panel will drop down by the depth of the ‘L’ cutout shapes enabling the access panel to be slid open.
  4. Slide access panel along the inside of the extrusions until the plunger locks into the base of the extrusion to gain access to the blowers.
  5. To close the access panel, ensure retaining brackets are aligned then push plungers back into the extrusion base to release access panel, before sliding back to its original aligned position.
  6. Lift the extrusion (on each side of the unit) containing the access panel to its original position so that the 3 extrusion fixings move back to the bottom of the ‘L’ cut-out shapes as shown and lock.
  7. To complete closure of the access panel and make secure, re-tighten 6 lower end panel fixings, 3 each end of the unit and the 6 base fixings, 3 each end of the access panel.

AVT 7-9 Access

  1. Release 6 base fixings, 3 each end of each access panel (note captive fixings).
  2. Release 6 lower end panel fixings, 3 each end of the unit.
  3. Lower the 2 runner mechanisms containing each side of the unit so the runner fixings move to the top of the cut-out slots shown below.
    When completed the runners / access panel(s) will drop down by the depth of the cut-out slots, enabling the access panel(s) to be slid open.
  4. Slide access panel(s) open along the inside of the runner mechanism to gain access to the blowers.
  5. To close the access panel(s) slide the access panel(s) back to the original aligned position.
  6. Lift the runner mechanism (on each side of the unit) containing the access panel(s) to the original positions so that the runner fixings move back to the bottom of the cut-out slots as shown in (A) Fig 17d and re-set the plungers in the closed position.
  7. To complete closure of the access panel(s) and make secure, retighten 6 lower end panel fixings, 3 each end of the unit and then the 6 base fixings, 3 each end of each access panel.
Changing Control Handing (AVT1-8 Only)

Choose your required control handing prior to unit installation.

  1. Remove access cover.
  2. De-couple control harness from main harness and remove control from unit complete with cable seal.
  3. Re-route cable to opposite side of unit (Note: Units 5-7 have internal handing harness),remove blanking plate and cut insulation to allow the control harness to be fed through the side panel. Refit control and cable seal and feed control harness and connect to internal harness or handing loom.
  4. When fitting lid (units 1-4) ensure lid is in the correct configuration as shown.


Isolation – Before commencing work, make sure that the unit and Nuaire control are electrically isolated from the mains supply.

Because the run and start currents depend upon the duty and associated ductwork of an individual unit, run currents will be exceeded if the unit is operated with its cover removed. It is therefore recommended that the unit is not run for prolonged periods in this condition.

Unit Details

Unit details including Full Load Current, Voltage, fan speed etc. can be found on the unit label.

Wiring Diagrams

The wiring illustrations below are for units without control. All wiring is terminated in junction boxes fitted to the side of the unit. Local isolator (by others)

Do not wire the power supply to motor via the motor alarm relay as terminals are only closed after the motor is energized.

The alarm relay on condensate may require the use of a contactor if the host equipment supply is switched.





The No Control (NC) units described in this manual are supplied without any controls. It is the installer’s responsibility to select and install suitable controller(s) and circuit(s) to produce the desired output from the units while remaining within the units safe performance envelope.


It is important that maintenance checks are recorded and that the schedule is always adhered to, in all cases, the previous report should be referred to.

Routine Maintenance
  • Clean all areas of unit and treat any areas of corrosion.
  • Check all access doors for leakage and if necessary locks should be adjusted and any replacement gasket materials should be replaced as required.
  • Thoroughly inspect the unit and its components for corrosion, acting immediately to treat/restore any damaged areas.
  • All electrical terminals within the unit should be tightened.
  • Check all earth connections.
  • Check control dampers blades.
  • Check operation of damper actuators and linkages and adjust as necessary.


The 2 year warranty starts from the day of delivery and includes parts and labour for the first year. The remaining period covers replacement parts only.

This warranty is void if the equipment is modified without authorisation, is incorrectly applied, misused, disassembled, or not installed, commissioned and maintained in accordance with the details contained in this manual and general good practice.

The product warranty applies to the UK mainland and in accordance with Clause 14 of our Conditions of Sale. Customers purchasing from outside of the UK should contact Nuaire International Sales office for further details.

Failure to maintain the unit as recommended will invalidate the warranty.


Where possible Nuaire use components which can be largely recycled when the product reaches its end-of-life:

  • Fans, motors, controls, actuators, cabling and other electrical components can be segregated into WEEE recycling streams.
  • Sheet metal parts, aluminium extrusion, heating/cooling coils and other metallic items can be segregated and fully recycled.
  • EPP, plastic ducting, nylon corner pieces, plastic heat exchangers, packaging material and other plastic components can be segregated into mixed plastic and widely recycled.
  • Cardboard packaging, wood, used filters and other paper components can be largely recycled or fully processed in energy from waste centres.
  • Remaining Items can be further segregated and processed in accordance with the zero waste hierarchy. Please call After Sales Support for further information on items not listed above.

Ensure that Nuaire product is made safe from any electrical / water / refrigerant supplies before dismantling commences. This work should only be undertaken by a qualified person in accordance with local authority regulations and guidelines, taking into account all site based risks.


For technical assistance or further product information, including spare parts and replacement components, please contact the After Sales Department.

If ordering spares please quote the serial number of the unit together with the part number, if the part number is not known please give a full description of the part required. The serial number will be found on the identification plate attached to the unit casing.

Replacing Fan / Motor

The only items of the fan units unit likely to require replacement are the fan/motor assemblies due to a failed motor or damaged impeller or damper actuator.

Remove the access cover. Disconnect the incoming wiring from the
connection box (located on the fan scroll) on the particular fan/motor assembly to be removed.

Remove the fan/motor fixings completely, other than the two slotted hole fixings. Support the fan/motor assembly and loosen the slotted hole fixings. The fan/motor assembly can now be turned and withdrawn from the unit.

After replacing the faulty item, refit the fan motor/assembly using the slotted hole fixings to assist in supporting the assembly. Re-connect the wiring. Replace the access cover.

Telephone 02920 858 400

Technical or commercial considerations may, from time to time, make it necessary to alter the design, performance and dimensions of equipment and the right is reserved to make such changes without prior notice.

Documents / Resources

nuaire AVT-NC Indoor Use Twin Fans with No Control [pdf] Installation Guide
AVT-NC Indoor Use Twin Fans with No Control, AVT-NC, Indoor Use Twin Fans with No Control



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